Why does the number of cyanobacteria in Taihu Lake increase rapidly due to high temperatures and low water levels?

I will give you a few articles.

The main reason for the outbreak of blue algae in Taihu Lake is the eutrophication of the water body.

The eutrophication of the water body in the Wuxi section of Taihu Lake is closely related to air temperature, water temperature, etc., and there are also geographical particularities.

The water quality of the upper reaches of the lake has deteriorated. In recent years, the protection of lakes in the upper reaches of Taihu Lake has been insufficient, and the lake ecosystem has been seriously degraded. Taihu Lake has lost its first natural protective barrier. This has directly led to an increase in the total amount of pollutants entering from the northwest of Taihu Lake. The algae content in most waters of Taihu Lake is at Extremely high level.

The lake water temperature is higher than normal. The annual highest water temperature in Taihu Lake occurs in July and August, and the annual lowest water temperature occurs from late December to early February of the following year. The highest water temperature in the past years reaches 38°C, and the lowest water temperature is 0°C. The annual range of water temperature ranges from 29.5 to 38.0°C. , the average variation is about 34℃, the average water temperature is 17.1℃, 1.3℃ higher than the land temperature, and the average water temperature in each month is higher than the air temperature. The winter of 2006 was the warmest winter since meteorological records were kept in Wuxi. The average daily temperature throughout the winter was more than 2°C higher than in previous years. This prevented large areas of cyanobacteria from freezing to death, creating conditions for an outbreak in 2007. Following the "warm winter", temperatures have continued to rise since the spring of 2007, providing suitable conditions for the wild growth of cyanobacteria. From January to April 2007, the water volume temperature of Taihu Lake was higher than the multi-year average. In particular, the monthly average water temperature in April was the highest in the past 25 years. After April 25, the water temperature of Taihu Lake has been exceeding 20℃. The entire May is also the highest temperature in history. highest month. These are beneficial to algae growth.

The water level in Taihu Lake is low. From January to April 2007, consecutive days of drought caused the water level of Taihu Lake to drop significantly. The water level in Taihu Lake was already very low, so it soon caused flooding, causing all the dirty things under Taihu Lake to float up. Taihu Lake has always been at a relatively low water level, with an average water level of 2.94 meters in four months, which is 13.4 centimeters lower than the same period in 2002, when the water volume temperature was the highest in the past 25 years. The extremely low water level increases the concentration of pollutants, further affecting the water quality. deterioration.

The wind direction concentration effect of southeasterly wind. Meiliang Lake is a large bay extending from Taihu Lake to the land. When the southeast wind blows, almost all the cyanobacteria in the outer Taihu Lake gather here. Experts once compared the more than 100 square kilometers of Meiliang Lake to a relatively still "pocket" of water. When the southerly wind blows, it becomes a gathering place for cyanobacteria in the entire Taihu Lake. In fact, Meiliang Lake in Wuxi has concentrated cyanobacteria from Jiangsu, Zhejiang and Shanghai in Taihu Lake, and Wuxi City’s water intake from Taihu Lake is here, so the outbreak of cyanobacteria has a great impact on the drinking water of Wuxi citizens.

There is little precipitation. The lack of rainfall weakens the purification ability of the water body itself, causing the water quality to further deteriorate. In addition, the ecological dredging project of Taihu Lake has caused the water body to be unable to flow, making Taihu Lake almost like water, thus exacerbating the disaster of blue algae.

However, the above phenomena that lead to the deepening of eutrophication of water bodies are not natural, and the large-scale outbreak of blue-green algae is not the fault of blue-green algae. The main culprit of Taihu Lake's pollution is still humans. Since the late 1980s, the main pollutants in Taihu Lake, total nitrogen and total phosphorus, have seriously exceeded standards, eutrophication has become obvious, and local mercury compounds and COD contents have also greatly exceeded standards. This is mainly caused by agricultural non-point source pollution, industrial point source pollution and domestic sewage discharged into Taihu Lake.

The primary cause of eutrophication in Taihu Lake is rural non-point source pollution. Non-point source pollution refers to the discharge of dissolved and solid pollutants from non-specific locations into receiving water bodies, including rivers, lakes, reservoirs and bays, through surface runoff under the erosion of precipitation or melting snow, and causes water bodies to eutrophication or other forms of pollution. Non-point source pollution is more associated with rural areas. Excessive and irrational use of pesticides and chemical fertilizers in rural areas of my country, livestock and poultry manure from small-scale livestock and poultry breeding, as well as untreated agricultural production waste, rural domestic garbage and wastewater are all direct factors causing non-point source pollution.

In addition, in recent years, the Taihu area in Wuxi and other places has regarded the chemical industry as a pillar industry, causing large and small chemical, electroplating, printing and dyeing companies to spring up in this area, with thousands of Polluting companies are lined up along Taihu Lake, and sewage is discharged directly into Taihu Lake. The township industry in the Taihu Lake Basin is quite developed, accounting for about 1/8 of the country's gross national product with less than 0.4 of the country's land area. The upstream areas have been unable to curb their "GDP complex", pursuing economic benefits one-sidedly and neglecting the treatment of pollution sources all over Taihu Lake.

Due to the efficient and rapid economic development model that has attracted a large number of immigrants, the population density of the Taihu Lake Basin has reached about 1,000 people per square kilometer. It is one of the regions with the highest population density in the world, and the level of urbanization ranks among the highest in the country. head. The accelerated process of urbanization and the increase in the migrant population have caused a rapid increase in the amount of urban domestic sewage, and a large amount of domestic sewage has been discharged into Taihu Lake without exception.

Lake is originally a large natural system, but people have developed and utilized it without restraint for a long time, which has led to the emergence of systemic problems in lakes. The dialectic between man and nature shows that the crude use of nature will inevitably lead to the revenge of nature. The relationship between man and nature has been seriously imbalanced, and nature has begun to retaliate against human overuse. Compared with rivers, lakes need to "recuperate" more. The ancient Taihu Lake has raised countless children around it. Now it is time for the children to abandon their greed and let her recuperate.

Reflecting on my hometown of Wuhan, data from the fifth census (2000) show that the average population density of Wuhan is 947 people per square kilometer, an increase of 132 people from 1990. According to this growth rate, Wuhan's population density should now exceed 1,000 people per square kilometer, which is comparable to the situation in the Taihu Lake Basin. Wuhan's urbanization rate is 82.86, which is also quite high, and the proportion of floating population is also large. However, unlike the Taihu Lake Basin, the highest population density in Wuhan City is Wuchang, with 12,020 people per square kilometer. Wuchang is the education center of Wuhan. College teachers and students here account for a large part of the population. Looking at the city as a whole, the fastest growing population group is also college students. But this does not reduce the level of pollution in Wuhan. Among my peers who grew up in Wuhan, many people suffer from upper respiratory tract diseases. Although a large number of factories have moved to the suburbs, this can only cause the pollution level in the suburbs to accelerate towards the urban area. For urban areas, , the change is not big. I have also seen the green water of the Yangtze River, but it is different from the green of Taihu Lake. The small fish and tadpoles under the river are clearly visible; I have also drank bitter tap water, and adding sugar cannot hide the bitterness, but it is caused by unexpected events. Yes, it was fine again within a day. Now I often see algae blooms in lakes and lakes in Wuhan. Almost all lakes have them, but I have never seen any signs of improvement. I often hear about large-scale flooding of lakes, but they happen almost every year. . Playing with the little fish in the river, those happy childhood days have become permanent memories. When I grew up, I never saw those fish in the river again. Maybe among the people who have such memories, my peers and I are the last generation! ——What a sad fact! As children of the Yangtze River and Han River, guarding the province of a thousand lakes and the county of a hundred lakes, we should have been alert long ago.

Some people suspect that the blue algae outbreak in Taihu Lake is related to the rice fields surrounding the lake, but this is not the case. Rice fields are the largest artificial wetland ecosystem on earth and play an important role in regulating regional climate. Research shows that under the same soil organic carbon level, rice field soil can retain more nitrogen and phosphorus, which can not only significantly improve soil fertility, but also significantly reduce nitrogen and phosphorus pollution to the surrounding environment. Therefore, rice will not cause cyanobacteria. The outbreak will instead limit the crazy growth of cyanobacteria and should exert its significant carbon sequestration, emission reduction, cooling effect and atmospheric purification function. However, the traditional concept of rice cultivation around Taihu Lake needs to keep pace with the times. On the basis of scientific planning of rice field layout, the rice production goal of "high yield and higher yield" should be changed to "high-quality and safe production", and the input of agricultural chemicals should be effectively reduced. We should carry out technological innovation in protective rice farming, actively develop environmentally friendly protective rice farming technology, and create a win-win situation for economic benefits and environmental protection.

In addition, there is another potential factor that has long been forgotten-the ecosystem food chain. Taihu Lake abounds in 48 species of fish, among which the commercial fish whitebait and white fish are famous. The construction of levees and dams around the lake in the 1960s blocked traffic between Taihu Lake and the Yangtze River, which reduced the number of silver carp that could originally swim into Taihu Lake. Among the common "four major fish" (herring, grass carp, silver carp, and bighead carp), silver carp is an "algae-eating fish" and a natural "nemesis" of blue algae. Silver carp cannot enter Taihu Lake, a link in the food chain has fallen, and cyanobacteria lack ecological natural enemies. It is only a matter of time before they grow wildly. It can be seen that man-made water conservancy projects have laid the root of today's disaster many years ago. The existence of all things in nature has its own laws, and there are many subtle connections among them that we humans cannot see clearly. This is the greatness of nature and the insignificance of us humans. If humans are already omnipotent, what else does God need to do? The Tower of Babel exists as a warning to all living things - nature created you, so you will never be more powerful than nature.

"Water bloom" is a natural ecological phenomenon in fresh water. The vast majority of algae blooms are only caused by algae, such as cyanobacteria (cyanobacteria), green algae, diatoms, etc.; some blooms are also caused by zooplankton - dinoflagellates. When an algae bloom occurs, fresh water usually appears blue or green.

In natural ecosystems, nutrients such as nitrogen and phosphorus are limiting factors for plant growth, which are the shortcomings of the barrel. If the nitrogen and phosphorus content increases significantly, that is, after the water body becomes eutrophic, the growth restrictions of plants will be lifted, and then they will reproduce in large numbers. The native plants at the bottom of the food chain (various phytoplankton, mainly algae) reproduce the fastest, and they quickly occupy a large amount of resources, thus restricting the growth of other plants and becoming the dominant population. In fresh water, the most common organisms that cause algae blooms are cyanobacteria. Since algae use light energy as energy and photosynthesis produces oxygen, when algae grow in large numbers, the dissolved oxygen on the surface of the water body becomes saturated or even supersaturated; but at the same time, cyanobacteria will also form a film on the water surface, blocking Sunlight and air enter, and when a large number of algae die, a large amount of dissolved oxygen in the water will be consumed due to the process of corrosion and degradation, resulting in a serious lack of dissolved oxygen in the water body, an anaerobic state, and a serious odor in the water body. In addition, in order to inhibit the growth of other organisms, algae will release a toxin - indigo, which is toxic to fish, destroys the diversity of organisms in the water body, leads to an increase in biological corpses and residues in the water body, and greatly increases the organic load. , and produce a large amount of nitrogen and phosphorus, further deepening the degree of anaerobic decomposition of microorganisms, thus forming a vicious cycle. Therefore, after freshwater eutrophication, algae blooms will appear frequently, the area will spread year by year, and the duration will extend year by year.

The biggest harm caused by algae blooms is the threat to drinking water sources. Cycotoxins affect human health through the food chain. MCRST, the secondary metabolite of cyanobacteria blooms, can damage the liver and promote cancer, directly threatening human health and survival. In addition, the filtering device of the water plant will be filled with algae, and the algae floating on the water will affect the landscape, and the water body will also have an unpleasant odor, etc. Therefore, every time algae bloom occurs, it will bring huge losses or disasters to humans and nature.

The most important factor leading to algae blooms is the eutrophication of water bodies. The main cause of eutrophication of water bodies is the large-scale application of chemical fertilizers along the water bodies, and the large amounts of domestic sewage and industrial wastewater discharged into rivers and lakes, resulting in an increase in the contents of nitrogen, phosphorus, potassium, etc. in rivers and lakes. In addition, water temperature, pH value, light intensity and other factors will affect the degree of algae bloom. 20~30℃ is the suitable temperature range for algae bloom to occur. A sudden increase in water temperature of more than 2°C within a week is a precursor to algal blooms. When nutrients and other conditions are suitable, a pH value of about 8 can promote the occurrence of algae blooms. If a bloom occurs, even if the initial pH value is not conducive to algae growth, the adaptive nature of algae allows it to be adjusted through a series of physiological and biochemical reactions. The pH of the water tends to be in an alkaline range suitable for growth. The stronger the light intensity, the more beneficial it is to the photosynthesis of algae, thereby promoting algae reproduction and greatly increasing the rate of algae reproduction.

When an algae bloom occurs, the waters are mostly dry and rainless, the weather is muggy, the water temperature is high, the wind is weak, and the tide is slow.

On May 6, 2007, blue algae began to break out in Taihu Lake. This "frequent visitor" that Wuxi citizens are infested every year came earlier and more fiercely this time. Wuxi City urgently activated the Changshu Water Conservancy Project Pumping Station to implement emergency water diversion from the Yangtze River. On the 16th, the water quality of Meiliang Lake turned black. On the 22nd, the Xiaowanli Water Plant stopped supplying water. On the 25th, the water quality of Gonghu Water Plant still met the water supply requirements. On the 28th, the water quality of the water source of Gonghu Water Plant seriously deteriorated. The water source had a foul odor and the water quality deteriorated. Black, the dissolved oxygen dropped to 0 mg/L, the ammonia nitrogen index rose to 5 mg/L per liter, and the residents' tap water smelled seriously. Since the 29th, the tap water has been thick and has a strong pungent fishy smell.

Since then, Wuxi citizens have been unable to drink tap water, or even use it to wash their faces and bathe. Citizens can only buy pure water to solve the drinking water problem. In older urban areas, citizens began to use well water for emergency relief. In daily life, I have to endure the pungent odor when washing my face, taking a bath, and brushing my teeth. I dare not put my nose near my hands. Some citizens left Wuxi to avoid the smell.

In order to ensure that residents can drink pure and delicious tap water, the water company does not hesitate to spend 6 cents on algae removal and deodorizing agents for every ton of water treated, and more than 1 million tons of water need to be treated every day. This alone costs more than 60,000 yuan a day. Moreover, it is difficult to completely remove the odor with chemicals, and water purifiers, activated carbon, and strong oxidants have no effect.

The landscape, fishery, and shipping industries in the Taihu Lake Basin will be hit hard, resulting in huge economic losses.

Emergency measures

Faced with the sudden outbreak of blue algae in Taihu Lake, the Wuxi Municipal Government took a series of emergency measures: First, increase the "Jiangjiang Jitai" (diversion of Yangtze River water to replenish Taihu Lake water) In order to dilute the eutrophic water quality of Taihu Lake, as of June 3, the government had diverted 430 million cubic meters of water from the Yangtze River, of which 246 million cubic meters were introduced into Taihu Lake; secondly, relevant domestic experts on cyanobacteria control were urgently invited Discuss relevant countermeasures to improve the water quality of Taihu Lake; third, pay close attention to the biochemical changes in tap water quality in order to make active responses. In addition, the gate connecting Taihu Lake to the inland river in Wuxi City was opened, and a number of closed deep-water wells were opened to supplement citizens' domestic water supply during the emergency. The municipal government organized personnel to salvage cyanobacteria and strengthened monitoring to purify water and stabilize water prices as soon as possible.

In order to alleviate the blue algae disaster in Taihu Lake, in response to the low rainfall, the relevant departments implemented rocket artificial rainfall operations in the Taihu Lake area on the afternoon of May 31 and the early morning of June 1, and achieved significant improvements. Rain effect. In response to citizens' water shortage, the government activated a number of closed deep wells to supplement citizens' domestic water supply during emergencies.

On May 31, Tsinghua University professor Zhang Xiaojian and his assistant came to Wuxi. Experts found that the 7-kilometer-long water pipeline from the Taihu Lake water intake to the water production plant has a process of two and a half hours. If a large amount of potassium permanganate oxidant is put into the water intake, during the more than 2 hours of water transportation, It can oxidize most of the odor-causing substances; and then put powdered activated carbon in the water production plant to remove the remaining odor-causing substances and decompose the remaining oxidants at the same time. After 17 hours of repeated experiments, at 7:40 a.m. on June 1, the odor of the water from the water plant was successfully eliminated. This key breakthrough brings hope for solving the drinking water crisis in Wuxi. On the evening of June 1, Wuxi City began to resume normal water supply, but water could not be used until all the old water in the water pipes was gone. On the morning of June 3, the health departments of Jiangsu Province and Wuxi City monitored and compared the quality of the tap water leaving the factory and the water quality in residents' homes. The quality of the tap water leaving the factory was stable and qualified. The sensory indicators, general chemical indicators, and toxicology indicators of the water leaving the water plant were all tested. , bacteriological indicators are in line with the national GB5749-85 water quality standards. Except for citizens who still rely on pure water for drinking and cooking, other domestic water supplies are normal.

Treatment methods

It has been a long time since we traced the history of pollution control in Taihu Lake, but the water quality of Taihu Lake has been deteriorating. One reason for this is the underestimation of possible anthropogenic pollutant emissions.

In the 1990s, the goal of "making Taihu Lake water clear by the year 2000" was proposed. At that time, it was estimated that only 540 million cubic meters of industrial wastewater entered rivers and lakes each year, and the annual discharge of domestic sewage was only about 320 million cubic meters. By 2000, the amount of sewage discharged increased fivefold. Monitoring data showed that the point source sewage discharge in the Taihu Lake Basin that year was 5.33 billion cubic meters. The second reason is that water resources protection and water pollution control in the Taihu Lake Basin are characterized by watershed characteristics and involve multiple departments such as water conservancy, environmental protection, construction, agriculture, fishery, and transportation. They must be comprehensively managed based on the watershed as a unit. Taihu Lake involves two provinces and one city. The cities around the lake must join hands to jointly manage it. Otherwise, Taihu Lake cannot be managed well. The third reason is that the current situation of blue-green algae outbreaks did not occur in a day, and it will take a long ecological cycle to control it properly. If you want to build a new water plant, the cycle of site selection, water intake plan, technical design, construction, etc. is also quite long.

From an ecological perspective, as early as January before the blue-green algae outbreak, some experts proposed raising fish in Taihu Lake to prevent and control blue-green algae. According to estimates, silver carp or silver carp can "eliminate" 40 to 50 kilograms of cyanobacteria for every 1 kilogram of weight gain. A silver carp fry of about 50 grams will be caught and landed when it grows to about 1.5 kilograms in Taihu Lake. It is estimated that from the time when the fry is released to the time it is caught and landed, a silver carp can eat about 60 kilograms of cyanobacteria in one day.

The Key Laboratory of Ion Beam Bioengineering of the Hefei Institute of Physical Sciences, Chinese Academy of Sciences, has developed an organic sewage treatment agent. Add it evenly to a cup of sewage, and it can remove nitrogen, phosphorus and other chemicals in 3 to 5 minutes. The algae flocculate and settle, and then the pollutants are completely removed through magnetic separation technology. The treated water body meets the national secondary discharge standards. Experts said that in the past, some water treatment products could only condense and precipitate pollutants, but could not remove them. Over time, pollution often broke out again. The organic sewage treatment agent they developed is composed of several non-toxic and harmless industrial wastes such as fly ash and materials such as chitosan, plus magnetic materials such as magnetic powder, and is made through physical and chemical modification. Into powder or aqueous masterbatch. Tests have shown that this water treatment agent coagulates with eutrophic lake water, first produces flocs, and then extends into the magnet to absorb and remove nitrogen, phosphorus and algae. This new achievement, due to the addition of magnetic separation technology, can achieve the goal of completely eradicating nitrogen, phosphorus and cyanobacteria, making up for the shortcomings of some water treatment products in the past.

In response to the outbreak of cyanobacteria, relevant experts proposed spraying diluted clay slurry into the lake, using the cohesion and adsorption effect of the clay on the algal cells to sink the cyanobacteria to the bottom of the water, controlling their growth and spread, and adding algae to the raw water at the same time. Activated carbon can also adsorb and precipitate cyanobacteria.

In order to remove algae toxins from water, Deng Chunhui, associate professor of the Department of Chemistry at Fudan University, conducted a study titled "Removal of algae toxins by adding copper ions to magnetic nanomaterials." Studies have shown that copper ions can combine with algal toxins through coordination. By attaching copper ions to magnetic nanomaterials, magnets can be used to easily extract the magnetic nanomaterials with algae toxins, thereby achieving the purpose of separating algae toxins from water bodies. In the laboratory stage, the separation rate of this method has reached more than 90%.

In order to prevent and alleviate the problem of eutrophication of water bodies, the "terrestrial plant hydroponic pollution control method" invented by Hu Huan and three other students from the Department of Environmental Science and Engineering of Fudan University provides a brand-new solution ideas. This method utilizes two common landscape plants, Philodendron bergamot and Philodendron philodendron, and cultivates them in severely eutrophicated water bodies to maximize the absorption of excess nutrients in the water.

Algae are organisms that can grow as long as there is sunlight and water and can be converted into fuel oil. Scientists have begun a plan to use algae to convert fuel oil. Vegetable oil extracted from algae can be converted into biodiesel, which can be used as fuel for almost all diesel engines. So someone came up with the idea of ??using blooms of cyanobacteria to make biofuel oil.

The nitrogen content of cyanobacteria is as high as about 10, and the phosphorus content is also close to 1. 1 cubic meter of cyanobacteria can produce 4 kilograms of nitrogen, equivalent to 8 kilograms of urea, plus the income from biogas production, comprehensive utilization of 1 cubic meter The total income from cyanobacteria can reach 50 yuan.

They have successfully made cyanobacteria into high-quality biofertilizers that can be a good substitute for chemical fertilizers. Currently, this achievement is about to be put into pilot testing near Taihu Lake. Once the project is finally successful, it can solve the fertilizer supply problem of 400,000 acres of land around Taihu Lake. The water body is eutrophic, while the surrounding farmland is nutrient deficient. This treatment method itself reflects the unscientific and unreasonable current situation of my country's agricultural production.

Follow-up treatment

Real-time monitoring of cyanobacteria status. The Jiangsu Provincial Bureau of Surveying and Mapping and the Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences jointly developed the "Taihu Lake Cyanobacteria Bloom Remote Sensing Dynamic Monitoring and Early Warning System", which uses satellite remote sensing space, geographical information technology, and lake surface measurement and sampling to establish the relationship between remote sensing spectra and cyanobacteria biomass. Model. After the system is completed, it will be able to dynamically monitor the occurrence, development and spatial distribution changes of cyanobacteria blooms. Through uninterrupted satellite image data output, it can judge the growth trend of cyanobacteria, conduct forecasts and warnings, and provide timely water quality data for the construction of new rural areas around the lake area. , providing sound management and technical services for agriculture, fishery production, and people’s domestic water use.

Control the source of pollution. Zhoutie Town in Wuxi, which is adjacent to Taihu Lake, covers an area of ??less than 73 square kilometers, but is home to more than 400 industrial enterprises, including more than 150 highly polluting enterprises. Years of rectification have shown no results. After the blue-green algae outbreak in 2007, Wuxi City will close 772 high-consumption, high-pollution, high-risk, and low-efficiency enterprises in the city by the end of 2008. In Yixing, Jiangsu, all new projects that emit nitrogen and phosphorus have been stopped. There are also nearly ten such old companies that, although they meet previous emission standards, have also been shut down and converted to production in accordance with the new environmental protection threshold. Jiangsu will close 2,150 small chemical companies by the end of 2008 in accordance with the law.

Current situation

At the beginning of April this year (2008), there was another large-scale algae outbreak in Taihu Lake, one month earlier than in 2007, and the lake water is like green paint and can be written on; Taihu Lake Just like a big dye vat, when things fall down and are picked up again, they are all dyed green. It is undeniable that the algal bloom phenomenon has not only not improved, but has become more serious. However, due to preparations in all aspects, residents' domestic water use was not affected.

The algae water separation project is expected to operate on a large scale. The Wuxi Taihu Algae Separation Station Demonstration Project is located at the northern end of Taihu Meiliang Bay. It is one of the key demonstration projects in Wuxi to implement harmless treatment and resource utilization of cyanobacteria. This project introduces algae separation and integration technology and uses mechanical methods to control blue algae. The technology is mature, low consumption and efficient, safe and practical, and the daily processing capacity can reach 5,000 tons of algae-rich water. After the project is implemented, it can solve three problems: efficient and rapid separation of algae, dehydration of algal slurry, and production of organic fertilizer from algae residue. Large-area algae blooms caused by cyanobacteria outbreaks can be quickly and effectively cleared in an emergency, with an algae removal rate of more than 95%. Take away a large amount of nitrogen and phosphorus, reduce the nutrient load in the water body, and improve the water quality. The algae-free water processed by the Taihu Lake Algae Separation Station can be directly returned to the lake for reuse, which can increase the transparency of the water body, improve the water body landscape, and create conditions for the ecological restoration of the lake.

Impressions

I have collected a lot of information and consulted some relevant knowledge, but I have never found any control measures for the eutrophication of water bodies themselves. We can only wait for the algae bloom to occur, and then treat and purify it during the use of water. That is to say, pollute first and then treat, and this kind of treatment is not fundamental. Although it may take a long time to fundamentally solve the problem, there seems to be no solution now, which makes people feel discouraged and sad!

Euttrophication of water bodies involves two aspects of environmental problems at the same time, namely environmental pollution and ecological destruction. In the above-mentioned exploration, these two aspects have been mentioned, but it is obvious that the current social reflection on the Taihu Lake cyanobacteria outbreak only sees environmental pollution, while not paying enough attention to ecological damage and the current status of the ecological environment. There is no specific research analysis. But I think it is faster and more effective to use biological or ecological methods to solve the problem of cyanobacteria in Taihu Lake.

In addition, the conditions in Wuhan and the Taihu Lake Basin are very similar. As a native of Wuhan, I am deeply worried that the story of Taihu Lake will repeat itself in Wuhan.