Advantages of screw sludge filter press in treating sludge wastewater from leather factory

 

What is leather sewage?

It generally refers to tanning wastewater, which is called by the industry. It refers to the waste water generated during the wet operation during the preparation and tanning stages of leather production.

Characteristics of tannery wastewater?

(1) Tannery wastewater is high concentration organic wastewater, and the concentration of COD and BOD in wastewater is very high.

(2) The toxicity of tanning wastewater comes from high concentration sulfide and trivalent chromium. Sodium sulfide is used for depilation and chromium salt is used for tanning. The content of chromium and sulfide in waste chromium liquid can reach thousands of mg per liter. The odor of tanning wastewater is mainly caused by protein decomposition and added sodium sulfide.

(3) SS in tannery wastewater is up to 3000 mg / L.

(4) The chroma of tannery wastewater is mainly caused by dyes and tanning agents, and the chroma of wastewater is 600 ~ 3000 times.

(5) Tannery wastewater is generally alkaline, mainly from lime, caustic soda and sodium sulfate used in depilation and other processes, and the pH value is often 9 ~ 10.

(6) The concentration of chloride and sulfate in tannery wastewater is 2000 ~ 3000 mg / L, which mainly comes from the processes of raw leather preservation, pickling and tanning.

Why is it difficult to treat tannery wastewater?

Among the characteristics of tanning wastewater, it is also involved, which is due to the large discharge of tanning wastewater, high pH value, high chromaticity, wide variety of pollutants and complex composition.

So, what are the advantages of screw sludge filter press in treating tannery wastewater?

1. The working principle of the screw sludge filter press determines that it is not easy to jam and is very suitable for viscous grease sludge. It is the best choice in the field of sludge dewatering at present.

2. The screw sludge filter press machine can be made into a sealed type. It is technically achievable, which can effectively avoid the spread of toxicity of leather sewage and protect the health and safety of operators.

3. The screw sludge filter press has the advantages of low capital cost, simple maintenance, and continuous operation. It is truly an equipment that can realize unmanned management.

4. Compared with other machines such as plate frame, centrifugal, belt conveyor, etc., the screw sludge filter press has good energy-saving and emission reduction effect, less cleaning water and low electricity consumption.

 

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