Intensified biological treatment device and method for degradation-resistant organic nitrogen-rich chemical wastewater

Abstract

The invention relates to an intensified biological treatment device and method for degradation-resistant organic nitrogen-rich chemical wastewater. The intensified biological treatment method comprises the following steps that when wastewater enters a water distributor from a water inlet system, sprinkled into the bottom of a hydrolytic acidification reactor, then flows into a water outlet system from bottom to top, and enters an anoxic zone of a membrane bioreactor; under the action of electrodes, the wastewater enhances the activity of denitrifying bacteria, and nitrogen removal by denitrification is achieved; the wastewater then enters an aerobic zone of the membrane bioreactor, ultrasound generated by an ultrasonic generator is transmitted into an energy converter, and ultrasonic stimulation is conducted on the wastewater to remove organic materials and ammonia nitrogen; the wastewater is pumped out of the membrane bioreactor though a membrane module and enters a water outlet end. The synergistic effect of hydrolytic acidification and the membrane bioreactor is fully utilized, the biodegradability can be improved by hydrolytic acidification, and the problems that degradation is difficult in the aerobic process, the organic materials are slow in degradation and organic loading is low are avoided; then the sludge concentration is improved by means of the membrane bioreactor, and the organic materials and ammonia nitrogen are further degraded.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a biologically enhanced treatment device and method for refractory high organic nitrogen chemical wastewater. Background technique [0002] Traditional aerobic methods are generally used in sewage treatment plants in chemical industry parks. Because the wastewater is characterized by the presence of a large amount of refractory organic matter and high concentration of organic nitrogen, on the one hand, the refractory organic matter has poor biodegradability and is difficult to be decomposed by aerobic microorganisms. Organic matter is difficult to meet the standard; on the other hand, organic nitrogen decomposes for a long time, and aerobic microorganisms decompose organic nitrogen and convert it into a large amount of ammonia nitrogen, resulting in high ammonia nitrogen concentration, and it is difficult to meet the standards for effluent ammonia nitrogen and...

AI Technical Summary

Problems solved by technology

[0002] Traditional aerobic methods are generally used in sewage treatment plants in chemical industry parks. Because the wastewater is characterized by the presence of a large amount of refractory organic matter and high concentration of organic nitrogen, on the one hand, the refractory organic matter has poor biodegradability and is difficult to be decomposed by aerobic microorganisms. Organic matter is difficult to meet the standard; on the other hand, organic nitrogen decomposes for a long time, and aerobic microorganisms decompose organic nitrogen and convert it into a large amount of ammonia nitrogen, resulting in high ammonia nitrogen concentration, and it is difficult to meet the standards for ammonia nitrogen and total nitrogen in the effluent

Especially under low temperature conditions in winter, the activities of ammonifying bacteria, nitrifying bacteria and denitrifying bacteria are poor, and ammonia nitrogen and total nitrogen are more difficult to meet the standards

In order to solve the above problems, the sewage treatment plant tries to solve the above problems by increasing the aerobic residence time and increasing the membrane bioreactor alone. Due to the inhibition of refractory wastewater and the slow decomposition of organic nitrogen under aerobic conditions, it is difficult to work.

Or solve the above problems by adding bacteria, but there are problems of high cost and unsatisfactory effect

[0003] Aerobic or membrane bioreactors enhanced by ultrasonic waves fail to consider the selectivity of ultrasonic intensity and frequency to microorganisms. Generally, high ultrasonic intensity is likely to cause irreversible damage to sludge and reduce microbial activity, while different ultrasonic frequencies are harmful to microorganisms. Selective, the invention patent application "Application of Ultrasonic in Biological Denitrification of Sewage Treatment" (publication number CN 104743657A G publication date 2015.07.01), in order to inhibit nitrifying bacteria and promote short-range nitrification

If one frequency of ultrasonic waves is selected, it is difficult to change, and it cannot achieve the effect of promoting both nitrifying bacteria and denitrifying bacteria

Or install broadband ultrasonic equipment, resulting in excessive investment

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