Sludge reducing method in sewage treatment

Abstract

The present invention provides a method capable of substantially reducing the sludge amount in sludge treatment. According to the method, the filler for filling the biological carrier in the sewage treatment main process is rich in a variety of trace elements for microorganism growth, the unique form of the biological carrier can form the DO changeable environment, the sludge retention time (SRT) is long, the variety is rich, the food chain is long, and the newly-generated sludge is progressively re-degraded by a variety of microorganisms so as to achieve the sludge reduction purpose. According to the present invention, the sludge generation amount of the sewage treatment process is reduced to 0.1-0.15% of the sewage amount from 0.8-1% of the sewage amount, the uncoupling agent adding is not required, no secondary pollution is generated, the variety and the quantity of the microorganisms can be easily controlled, the control is easy, the effect is significant, the application range is wide, the method can be used for treating municipal wastewater, park wastewater, industrial wastewater, domestic wastewater and other organic wastewater, the operating is stable, the changes of the hydropower and the water quality can be bore, and the adjust workload is low.

Description

technical field [0001] The invention relates to a method for treating sewage, in particular to a method for reducing the amount of sludge in sewage treatment. Background technique [0002] The activated sludge method is mostly used in the treatment of industrial wastewater in our country. It has the advantages of low capital investment and good treatment effect, but it has always had one of the biggest drawbacks, that is, a large amount of excess sludge will be generated during operation. [0003] At present, the commonly used treatment and disposal methods of excess sludge include agricultural utilization, landfill, incineration, and ocean discharge, etc., but these disposal methods all have disadvantages without exception. [0004] Secondly, various sludge treatment and disposal methods require huge funds. At present, more than 80% of the sewage treatment plants in the world use the activated sludge method to treat sewage. The proportion of fees is as high as 60-70%. [...

AI Technical Summary

Problems solved by technology

[0009] The third category is to use chemical or biological methods to promote uncoupling metabolism, resulting in energy leakage, thereby reducing the efficiency of biological growth

This type of technology has high requirements for equipment, large investment, and is easy to cause secondary pollution

[0011] The second category is to increase the number of bacterial predators in the system. The disadvantage of this sludge reduction technology that simulates the food chain principle in natural ecosystems is that it is difficult to control the types and quantities of microorganisms.

[0012] The third category is the uncoupling agent, which has the following problems in practical application: after a long period of time, the drug is degraded due to the domestication of microorganisms, thereby losing the uncoupling effect; after adding the uncoupling agent, Although the output of sludge has decreased, from the perspective of material conservation, more oxygen is needed to deoxidize the organic matter that has not been converted into sludge, thus increasing the oxygen supply; the cost of adding decoupling agent also needs to be adjusted In comparison, since the concentration in sewage needs to be maintained at 4-80mg / L, the dosage is also surprising; the biggest weakness of uncoupling agents in practical applications is environmental safety issues

The uncoupling agent is usually a compound that is difficult to biodegrade or is highly toxic to organisms, so that the degradation of the uncoupling agent by the organism is not complete, which will bring new pollution to water treatment

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