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Device and method for electrochemically treating sewage with microorganisms and microbial film culture method

A microbial electrochemical and microbial membrane technology, applied in the field of microbial membrane cultivation, can solve the problems of affecting nitrification reaction speed, increasing power consumption and operating costs, and long hydraulic retention time, so as to reduce sewage treatment costs and reduce sludge production , The effect of reducing operating costs

Inactive Publication Date: 2016-08-17
JURONG SUMITE ENVIRONMENTAL PROTECTION TECH CO LTD
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AI Technical Summary

Problems solved by technology

[0006] (1) In the presence of a large amount of organic matter, autotrophic nitrifying bacteria are inferior to aerobic heterotrophic bacteria in competition for oxygen and nutrients, resulting in the dominance of heterotrophic bacteria; denitrifying bacteria use organic matter as electron donors, while organic matter Existence affects the speed of nitrification reaction; nitrification reaction and denitrification reaction require a great difference in DO concentration
The different requirements of the above-mentioned nitrifying bacteria and denitrifying bacteria make it difficult to unify the two processes of nitrification and denitrification in time and space.
[0007] (2) Nitrifying bacteria take a long time to metabolize, reproduce very slowly, and have a harsh growth environment. Under many conditions, they cannot gain an advantage in growth competition with heterotrophic microorganisms
The growth rate of nitrifying bacteria is slow and it is difficult to maintain a high biological concentration, especially in low temperature winter
Therefore, the total hydraulic retention time of the system is longer, the organic load is lower, and the capital investment and operating costs are increased.
[0008] (3) In order to maintain a high biological concentration and obtain a good denitrification effect, sludge reflow and nitrification liquid reflow must be carried out at the same time, which increases power consumption and operating costs
[0010] (5) Biological denitrification is not suitable for the treatment of high-concentration ammonia nitrogen wastewater

Method used

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  • Device and method for electrochemically treating sewage with microorganisms and microbial film culture method

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Embodiment 1

[0044] like figure 1 As shown, the device provided by the present invention utilizing microbial electrochemical treatment of sewage comprises: grid and grit chamber A, aerobic electrode chamber B, isolation pond C, anoxic / anaerobic electrode chamber D, aerobic electrode chamber B and The bottom of the isolation tank C is connected to each other, the water inlet of the anoxic / anaerobic electrode chamber D is provided with a baffle (not shown in the figure), the water outlet of the anoxic / anaerobic electrode chamber D is connected to the drain pipe J, and the anoxic / anaerobic electrode chamber D is connected to the drain pipe J. The water outlet of the anaerobic electrode chamber D is also connected to the grid and the grit chamber A through the pressure water pump (reflux pump) L2 and the return pipe K. The aerobic electrode chamber is an open-top reactor filled with inert porous conductive materials, which can be filled with graphite particles, activated carbon, graphite sheet...

Embodiment 2

[0047] Before the sewage treatment, the enrichment culture of the microbial film is carried out by using the device for electrochemically treating sewage provided by the invention.

[0048] The first is the load of activated sludge in the aerobic electrode chamber and the anoxic / anaerobic electrode chamber: add an inert porous conductive material G in the aerobic electrode chamber (the top is not closed), and add an inert porous conductive material G in the anoxic / anaerobic electrode chamber D ( Inert porous conductive material I is added in the top closed). The seeded activated sludge is injected into the aerobic electrode chamber through the top of the aerobic electrode chamber, so that the activated sludge is in full contact with the inert porous conductive material. The remaining activated sludge flows into the anoxic / anaerobic electrode chamber through the isolation tank C, and the activated sludge fully contacts with the inert porous conductive material. Afterwards, the...

Embodiment 3

[0056] to deal with NH 4 + -The sewage with N concentration of 1800mg / L is an embodiment, and the operation process of the process of the present invention is described:

[0057] (1) Sewage enters the grid and grit chamber to remove suspended large particles.

[0058] (2) The sewage that removes suspended large particles enters the aerobic electrode chamber. The dissolved oxygen content in the aerobic electrode chamber is greater than 1 mg / L, preferably 2 to 5 mg / L, and the present embodiment is controlled at 2 to 3 mg / L to monitor the DO (dissolved oxygen) of sewage in the aerobic electrode chamber. When DO is lower than 2 mg / L When L, increase the operating voltage of the aerobic electrode chamber to increase the rate of oxygen generation. The pH value is controlled at 6.0-9.0, preferably 6.5-8.5, and in this embodiment is controlled at 7.2-8.5. Monitor the pH value of the sewage in the aerobic electrode chamber. Due to the nitrification reaction of the electrolytic reac...

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Abstract

The invention discloses a method and device for electrochemically treating sewage with low-concentration carbon sources and super-high concentration ammonia nitrogen with microorganisms. The method includes the steps that under the condition that free or only a small quantity of carbon sources exist, high-concentration ammonia nitrogen sewage is treated with the electrochemistry biological denitrification method, ammonia nitrogen pollutant is converted into harmless nitrogen, operation is easy, secondary pollution is avoided, the ammonia nitrogen content of the sewage is up to the standard, and the sewage can be safely discharged; the sewage pretreated by a grating and grit chamber enters an aerobic electrode chamber, a bacteria nitrifying membrane or sludge particulates are subjected to a nitratlon reaction through oxygen generated by electrolyzed water, and ammonia nitrogen is removed; the sewage enters an anaerobic / anaerobic electrode chamber through an isolation pond, a bacteria denitrifying membrane loaded on the conductive electrode surface is subjected to an electrode denitrification reaction through electrons, and nitrate and nitrite are converted into harmless nitrogen. According to the method and device, the occupied area is small, organic carbon sources are not required for denitrification when the high-concentration ammonia nitrogen sewage is treated, the treating efficiency is high, operation is stable, energy is saved, the device is easy and convenient to maintain, and the good application prospects are achieved.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and designs a device and method for using microorganisms to electrochemically treat sewage, in particular to a device and method for using microorganisms to electrochemically treat low-concentration carbon sources and ultra-high-concentration ammonia-nitrogen industrial and domestic sewage, and microbial film cultivation method. Background technique [0002] Ammonia nitrogen wastewater mainly comes from chemical fertilizers, coking, petrochemicals, pharmaceuticals, food, landfills, etc. Ammonia nitrogen in domestic sewage mainly comes from toilet sewage discharge. The discharge of a large amount of ammonia nitrogen wastewater into the water body not only causes eutrophication of the water body, causes the water body to be black and smelly, but also increases the difficulty and cost of water supply treatment, and even produces toxic effects on the population and organisms. There are biol...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F101/16
CPCY02W10/37C02F9/00C02F1/001C02F1/52C02F3/005C02F3/302C02F3/34C02F2101/16C02F2103/005C02F2201/009C02F2203/004C02F2209/06C02F2209/14C02F2209/15C02F2301/046C02F2303/06
Inventor 成亮徐来
Owner JURONG SUMITE ENVIRONMENTAL PROTECTION TECH CO LTD
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