Do leather factories pollute the environment a lot? Are there any companies currently working hard on environmental protection?

Tanneries have a great impact on environmental pollution, which is mainly analyzed from the following aspects:

1. Tannery production generally includes: preparation section, tanning section, and finishing section ;

2. Production process:

The raw leather is washed - soaked - depilated - limed - fleshed - cleansed - washed - softened - Washing - pickling - chrome tanning - smoothing - neutralization - dyeing - oiling - finishing - finished product

Pollution sources and factors:

Manufacturing Leather wastewater (COD, BOD5, SS, sulfide, chloride ion, trivalent chromium, phenol, PH, color, animal and vegetable oil, etc.)

Air pollution (TSP, PM10, SO2, NOX, NH3, H2S, odor, etc.)

Solid waste (waste wool, meat membrane, scraps of skin, scraps, leather scraps, sewage station sludge, boiler cinder)

Noise (equipment noise)

In addition to boiler flue gas, tannery waste gas also includes volatiles from organic solvents used in production and odorous pollutants from raw material hide storage, production processes and sewage stations.

Wastewater is mainly Source: During the production and processing of raw leather, a large amount of protein and fat enter the waste water and waste residue; a large part of the chemical raw materials used such as acids, alkalis, salts, sodium sulfide, lime, chrome tanning agents, dyes, etc. enter Wastewater. Wastewater in tanning mainly comes from the preparation, tanning and wet processing sections. The wastewater discharge and pollution load of the preparation section before tanning account for 70% of the total tanning wastewater; the tanning stage and the wet processing stage respectively account for 70% of the wastewater. The amount is about 8 and 20;

Tannery wastewater is highly alkaline, dark in color, and contains inorganic substances such as protein, fat, dyes, chromium, sulfide, chloride, etc. It is toxic and harmful wastewater. Among them The sulfide content in the dechromization process and the gray-alkali hair removal waste liquid seriously exceeds the standard. These two wastewater streams are the focus of wastewater treatment in the tanning industry.