A kind of recovery regulation method after acidification of anaerobic bioreactor
An anaerobic reactor and reactor technology, applied in the direction of anaerobic digestion treatment, chemical instruments and methods, water pollutants, etc., can solve the problems of difficult control of the amount of addition, adverse effects of the reactor, long recovery time, etc., and achieve rapid Efficient and convenient recovery, normal operation and easy operation
Active Publication Date: 2022-04-22
NANJING UNIV
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Problems solved by technology
However, this method cannot fundamentally eliminate the accumulated VFA, and the recovery time is relatively long
Alkaline reagents include NaOH, NaHCO 3 , CaO, etc. The principle of this method is to directly neutralize VFA and supplement alkalinity, but it is difficult to control the amount of addition, too high may bring adverse effects on the reactor
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[0057] The flow chart of the recovery control method after the acidification of the anaerobic bioreactor provided by the embodiment of the present invention is as follows: figure 1 As shown, the following processing steps are included:
[0058] Step S110, anaerobic reactor acidification
[0059] The inoculated sludge was placed in a serum bottle, and a higher COD concentration was configured in the influent water to simulate a situation with a higher initial load. Influent water quality components include glucose, ammonium chloride, sodium dihydrogen phosphate, calcium chloride dihydrate, and sodium bicarbonate. Specifically, the influent COD is about 12000mg / COD / d, and the alkalinity is about ≥600mg / LCaCO 3 / L, the concentration of ammonia nitrogen is about 50mg / L. After a period of time, the pH of the reactor effluent is stable below 5.5, and the COD removal rate is stable below 55%. At this point, the acidification of the anaerobic reactor is complete.
[0060] Step S1...
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The invention belongs to the technical field of sewage biological treatment, and discloses a recovery control method for an anaerobic bioreactor after acidification, comprising the following steps: S1, controlling the COD concentration of influent water; S2, designing and adding exogenous nitrate concentration, utilizing nitrate Denitrification reaction occurs with volatile fatty acids in the anaerobic system, consuming H in the system + and volatile fatty acids to generate alkalinity; S3, repair culture, control the alkalinity of the anaerobic reactor system, fully stir, so that the dissolved gas can be released quickly; S4, based on the recovery of the anaerobic reactor, gradually reduce the influent nitric acid The amount of salt added, no nitrate will be added after the stability is restored. The method is based on the denitrification reaction consuming hydrogen ions and VFA, generating alkalinity, realizing the recovery of pH and the recovery of the anaerobic reaction system after acidification. The method is simple, feasible, and easy to implement. It only needs to add a certain amount of nitrate to achieve high recovery efficiency, and the cost is low, and the amount of addition is easy to control.
Description
technical field [0001] The invention belongs to the technical field of sewage biological treatment, and in particular relates to a recovery control scheme for an anaerobic bioreactor after acidification. Background technique [0002] Environmental factors affecting the treatment of anaerobic bioreactors include temperature, pH value, alkalinity, redox potential, salinity, etc. Among them, the pH value is one of the most important influencing factors in the anaerobic treatment of wastewater. In the anaerobic reaction system, hydrolytic bacteria and acid-producing bacteria have good adaptability to pH, and most of these bacteria can grow well in the range of pH 5.0-8.5. However, methanogens are more sensitive to pH, and the suitable pH range for their growth is 6.5-7.8. Improper operating conditions will adversely affect the methanogens, destroy the balance of acid and methanogenesis, lead to the accumulation of fatty acids, and then lead to the acidification of the reactor....
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IPC IPC(8): C02F9/14C02F1/70C02F101/32
CPCC02F9/00C02F1/70C02F3/28C02F2101/322C02F2209/08C02F2209/06C02F2209/36
Inventor 丁丽丽双娅楠张龙任洪强
Owner NANJING UNIV