Coagulant adding method of A/O biological decarbonization and denitrification technology

Abstract

The invention discloses a coagulant adding method of an A / O biological decarbonization and denitrification technology. The addition amount of the coagulant is adjusted according to the water inlet and water outlet conditions of a secondary sedimentation tank, and the addition point of the coagulant is adjusted according to the water outlet condition of the secondary sedimentation tank. In the technical scheme disclosed by the invention, the addition amount and addition point of the coagulant are adjusted and controlled in a targeted manner according to different water quality conditions on the scene, the treatment cost of the coked wastewater is reduced, and each discharge index of production wastewater is stabilized and reaches the standard.

Description

technical field [0001] The invention relates to a sewage treatment technology, in particular to a coagulant dosing method for an A / O biological decarburization and denitrification process. Background technique [0002] A / O is the abbreviation of Anoxic / Oxic. Its advantage is that in addition to degrading organic pollutants, it also has a certain function of denitrification and phosphorus removal. It uses anaerobic hydrolysis technology as the pretreatment of activated sludge. So the A / O method is an improved activated sludge method. The A / O process connects the anoxic section in the front section and the aerobic section in the back section in series. The DO in the A section is not more than 0.2mg / L, and the DO in the O section is 2-4mg / L. In the anoxic section, heterotrophic bacteria hydrolyze suspended pollutants such as starch, fiber, carbohydrates and soluble organic matter in sewage into organic acids, decompose macromolecular organic matter into small molecular organic...

AI Technical Summary

Problems solved by technology

[0005] 1. The dosage of coagulant is fixed according to the design requirements. When the water quality is poor, the coagulation and demulsification effects are not obvious, and the COD and oil content of the effluent are high; when the water quality is good When the coagulant is too much, there are too many suspended flocs, which will affect the air flotation separation effect, increase the turbidity of the effluent, and increase the workload of sludge treatment due to the thick mud layer.

[0006] 2. In the existing technology, the design dosing point is at the outlet of the secondary sedimentation tank. When the separation effect of the mud and water in the secondary sedimentation tank is not good, and the settlement performance of the activated sludge in the system is reduced, a large amount of water will be attached to the secondary sedimentation tank. Sediment, resulting in a decrease in the concentration of activated sludge in the system, and at the same time increasing the load of advanced treatment, increasing the dosage of coagulant, resulting in fluctuations in effluent quality