Efficient sludge reflux enhanced magnetic coagulation system and precipitation method thereof

Abstract

The invention discloses an efficient sludge reflux enhanced magnetic coagulation system and a precipitation method thereof. The precipitation system comprises a magnetic coagulation reaction system, adeep curing tank and a precipitation tank, the magnetic coagulation reaction system, the deep curing tank and the precipitation tank are sequentially communicated, and the precipitation method comprises the steps of magnetic coagulation reaction, deep curing, precipitation and sludge diversion; sludge in a magnetic recovery system is finally discharged in the form of residual sludge, sludge backflow in the precipitation method is divided into two stages, and sludge backflow in the first stage means that sludge in the precipitation tank flows back to the deep curing tank through a sludge scraping system; and in the second stage, the sludge in the deep curing tank flows back to the coagulation reaction system through a sludge distributor. The efficient sludge reflux enhanced magnetic coagulation system has the advantages of simple structure, easiness in sludge reflux control, stability in operation, durability and the like, the effluent quality is stabilized, suspended solids, total phosphorus and the like can be effectively removed, and the effluent quality is stabilized.

Description

technical field [0001] The invention relates to the field of sludge treatment, in particular to a high-efficiency sludge reflux enhanced magnetic coagulation system and a sedimentation method thereof. Background technique [0002] In the process of magnetic coagulation and sedimentation, coagulants such as iron and aluminum and flocculants such as polyacrylamide are usually added to produce sedimentation sludge containing such suspended colloidal particles. The alum flower particles in the sludge are a kind of adsorbent 、It can absorb the suspended solids in water and the precipitates generated by the reaction to separate them from the water. At the same time, the precipitates generated by the reaction also play the role of crystallization core, which promotes the gradual growth of the sediments and accelerates the sedimentation and separation. The return of sludge to the front of the coagulation and sedimentation unit can increase the concentration of particulate matter in ...

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Problems solved by technology

[0002] In the process of magnetic coagulation and sedimentation, coagulants such as iron and aluminum and flocculants such as polyacrylamide are usually added to produce sedimentation sludge containing such suspended colloidal particles. The alum flower particles in the sludge are a kind of adsorbent 、It can absorb the suspended solids in water and the precipitates generated by the reaction to separate them from the water. At the same time, the precipitates generated by the reaction also play the role of crystallization core, which promotes the gradual growth of the sediments and accelerates the sedimentation and separation. The return of sludge to the front of the coagulation and sedimentation unit can increase the concentration of particulate matter in the water, increase the effective collision probability of particles, and increase the flocculation core; on the other hand, the colloidal flocs such as iron and aluminum contained in the sludge can continue to play a role Coagulation such as capture, charge adsorption, volume sweeping and physical adsorption, thereby reducing the dosage of coagulants, flocculants and other chemicals, and improving the coagulation effect. Currently, there are scrapers and suction at the bottom of the secondary sedimentation tank in the existing treatment methods. The mud mouth and so on use the water pump to return the sludge liquid and discharge the remaining sludge. By setting the inner and outer cylinder structures in the sedimentation area, the sludge at the bottom is sucked up by the way of water jet flow to realize the sludge return. In addition, there are The two-stage sludge reflux enhanced coagulation process, through the two-stage coagulation method, returns the second-stage sludge to the first stage, thereby reducing the deterioration of the effluent caused by reverse mixing after the sludge reflux. The above-mentioned sludge reflux method is more It is complicated, the sludge return flow is not easy to control, and the working stability of the relevant detection instruments involved in the instrument needs to be tested. In view of this situation, a high-efficiency sludge return enhanced magnetic coagulation treatment method is proposed, and the high-concentration sludge return process is difficult to control. characteristics to solve the problem of low utilization rate of sludge in sewage treatment

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