A method for electrochemically enhanced enzyme-promoted anaerobic digestion of excess sludge

Abstract

The invention discloses a method for electrochemically strengthening enzymes to promote anaerobic digestion of excess sludge, which includes: activated carbon pretreatment, embedding method to immobilize enzymes, attaching enzyme preparations to the surface of activated carbon and constructing solar photovoltaic electrochemical anaerobic digestion sludge system. The present invention first constructs an electrochemical three-dimensional particle electrode system, immobilizes the composite enzyme system on the surface of the electrode by embedding technology, supplies power with low voltage from solar photovoltaic cells, stimulates microorganisms with low voltage direct current, maintains the temperature of the system at about 35°C, and makes the sludge Spontaneous hydrolysis under the action of its own microorganisms and the action of external enzymes increases the rate of cell disruption and exposes complex ions such as metal ions in sludge; complex ions interact with external enzymes to form complexes, exposing the electroactive centers of enzymes on the electrode surface , under the electrochemical action of the particle electrode, the enzyme activity increases, the sludge degradation rate is improved, and the residual sludge is highly reduced in a short period of time under low energy consumption. The process is simple, the operation is simple, and the cost is low.

Description

technical field [0001] The invention relates to a method for electrochemically strengthening enzymes to promote anaerobic digestion of excess sludge, belonging to the field of excess sludge reduction. Background technique [0002] As a low-cost, high-efficiency water treatment technology, the activated sludge process is widely used in the field of wastewater treatment, but the treatment of a large amount of excess sludge generated by it has become a difficult problem at present. Sludge treatment methods and indicators put forward higher industry requirements. Excess sludge contains a large amount of toxic and harmful substances such as organic matter and heavy metals. If it is not properly treated, it will cause more serious secondary pollution effects on the environment. Therefore, sludge reduction is an important part of sewage treatment. To achieve the effective degradation of sludge, first consider reducing the generation of sludge from the source, that is, the water tr...

AI Technical Summary

Problems solved by technology

[0005] After searching the relevant patents on anaerobic digestion of excess sludge, the results are as follows: the patent application with publication number CN101851049 A discloses an online ultrasonic anaerobic membrane biological reaction system and its operation method, and reports that ultrasonic and anaerobic membrane biological Reactors are coupled to treat sludge. This method can achieve sludge reduction to a certain extent, but there are disadvantages such as complex process, high investment and operation costs, and membranes are easily polluted.

The patent application whose publication number is CN 103922554 A reports using microbial electricity to promote sludge anaerobic digestion. This method uses domesticated anode electroactive microorganisms to promote sludge anaerobic digestion after pretreatment of sludge, although the cost is relatively high. Low, but the pre-processing is complicated, the follow-up operation is cumbersome, and the microbial flora takes a long time to acclimatize

[0006] In summary, the limitations of existing technologies have seriously affected the reduction, harmlessness and resource utilization of petrochemical sludge