In the activated sludge method, what is related to the quality of sewage treatment

A variety of chemicals can be used for sludge deep dewatering, and the following are the most common chemicals used for ordinary sludge dewatering:

Cationic polyacrylamide: This is a polymer flocculant, which can flocculate small particles in sludge into larger particles through adsorption and bridging, and improve the sedimentation performance and dewatering performance of sludge.

Polyaluminum chloride: This is an inorganic polymer coagulant, which can coagulate with impurities in the sludge to form an insoluble precipitate, so that the water in the sludge is separated.

Lime: Lime can neutralize with the acids in the sludge, adjust the pH value of the sludge, and promote the cohesion and settlement of the sludge.

Diatomaceous earth: Diatomaceous earth has the characteristics of porosity and high specific surface area, which can be used as a filter aid to improve the filtration performance and dewatering performance of sludge.

It should be noted that different kinds of agents are suitable for different sludge properties and treatment requirements, so it is necessary to choose the appropriate agent according to the specific situation in practical applications. For sludge with high organic matter, under the condition that lime is not allowed to be added in the process, it is necessary to customize the organic deep sludge dewatering agent, and adjust the corresponding process parameters to ensure the sludge treatment effect.

In addition to biodegradability, oxygen content and sludge content, temperature and pH are also important. Temperatures that are too low can lead to a decrease in sludge activity.

Biodegradability, oxygen content, sludge content.

The activated sludge method mainly removes the following substances with car molds:

1. BOD, biodegradable organic matter, the organic pollutants in sewage are divided into plant organic matter and animal organic matter, and BOD is the amount of organic matter that can actually be removed. As for COD, it is the total amount of organic pollutants in sewage, which is not the total amount that can be removed.

2. Phosphorus is divided into organic phosphorus and inorganic phosphorus, organic phosphorus is cultivated by organic pesticides, and inorganic phosphorus includes orthophosphate and metaphosphate.

3. Nitrogen, divided into organic nitrogen and inorganic nitrogen, organic nitrogen protein, amino acids, urea, organic amines, ammonia nitrogen, etc.; Inorganic nitrogen is ammonia nitrate nitrogen, nitrite pan orange ammonia nitrogen;

According to the definition of sludge, sludge is a solid precipitate produced by the water and sewage treatment process, and the so-called solid precipitate material does not include screening, scum and sediment, but refers to the semi-solid and solid material produced during the treatment process. It is a thick substance between liquid and solid and can be transported by pump, but it is difficult to separate solids from liquid by sedimentation.

The Water Pollution Prevention and Control Law stipulates that sludge refers to the (semi-solid) or (solid) substances produced in the sewage treatment process, excluding screening, scum and sediment. Sludge is a product of sewage treatment and is an extremely complex heterogeneous body composed of organic residues, bacterial bacteria, inorganic particles, colloids, etc. The main characteristics of sludge are high moisture content (up to 99% or more), high organic matter content, easy to decay and smell, and fine particles, small specific gravity, and gelatinous liquid.