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Method for repairing acidification system of anaerobic reactor under condition of high influent COD (Chemical Oxygen Demand) concentration

An anaerobic reactor and anaerobic acidification technology, which is applied in the field of repairing anaerobic reactor acidification system under the condition of high influent COD concentration, can solve problems such as failure to repair, cell membrane death, etc., achieve simple operation and promote the formation of acetate Effect

Pending Publication Date: 2022-06-28
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the method in the prior art with the publication number CN113060896A is used to directly restore the high-concentration organic wastewater, since it is necessary to add high-concentration nitrate, it will inhibit the activity of methanogens, and even cause the cell membrane to be destroyed and die, so it cannot achieve the purpose of repair

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  • Method for repairing acidification system of anaerobic reactor under condition of high influent COD (Chemical Oxygen Demand) concentration
  • Method for repairing acidification system of anaerobic reactor under condition of high influent COD (Chemical Oxygen Demand) concentration
  • Method for repairing acidification system of anaerobic reactor under condition of high influent COD (Chemical Oxygen Demand) concentration

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Embodiment 1

[0044] The effects of the method for restoring methane production after acidification of the anaerobic bioreactor under different influent COD concentration conditions provided in the embodiments of the present invention are as follows: figure 1 It includes the following processing steps:

[0045] Step S1, analysis of system characteristics after acidification of anaerobic reactor

[0046] Analyze the water quality after acidification of the anaerobic wastewater treatment system, pH = 5.5, COD removal rate ≤ 60% (the original influent COD concentration of the acidification reactor> 8000mg / L);

[0047] Step S2, influent water quality control: control the initial influent COD concentration to 2000 mg / L, and then gradually increase it to 6000 mg / L.

[0048] Step S3, adding exogenous nitrate and oxygen

[0049] Specifically, designed to add exogenous nitrates and O 2 Concentration, a total of 8 experimental groups were set up, C:N was 22-33:1, and the amount of oxygen introduce...

Embodiment 2

[0083] The recovery control method after acidification of the anaerobic bioreactor under the condition of high influent COD concentration provided by the embodiment of the present invention includes the following processes:

[0084] Step S1, analysis of system characteristics after acidification of anaerobic reactor

[0085]Analysis of the water quality after acidification of the anaerobic wastewater treatment system, the COD concentration of the influent water is >8000mg / L, pH=4.5, the COD removal rate is ≤60%, and the propionate content is 533mg / L, accounting for 19% of the total VFA;

[0086] Step S2, influent water quality control: control the influent COD concentrations to be 6000 and 8000 mg / L, respectively.

[0087] Step S3, adding exogenous nitrate and oxygen

[0088] Specifically, designed to add exogenous nitrates and O 2 Concentration, control 2 groups of high influent COD concentration: the experimental group R6000-H with the influent COD concentration of 6000mg / ...

Embodiment 3

[0120] The recovery control method of the UASB reactor after acidification provided by the embodiment of the present invention comprises the following process:

[0121] Analysis of the water quality after acidification of the anaerobic wastewater treatment system shows that the COD concentration of the influent water is >8000 mg / L, pH=5.3, and the COD removal rate is ≤50%; the initial influent COD concentration is controlled to be 3000 and 6000 mg / L, respectively. For the two groups of UASB reactors, the initial influent COD concentrations were set to 3000 (RL) and 6000 mg / L (RH), respectively, and the HRT was 2d. Among them, the concentration of nitrate added in RL is 80mg / L, and the amount of oxygen added in a single cycle is 30mgO 2 / gCOD; the concentration of nitrate added in RH is 80mg / L, and nitrate is added twice in a single cycle, and the amount of oxygen added is also 30mgO 2 / gCOD. The repair culture was carried out to the second stage (59-80 d), the addition of ox...

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Abstract

The invention discloses a method for repairing an anaerobic reactor acidification system under the condition of high influent COD (chemical oxygen demand) concentration, which comprises the following steps: firstly, maintaining the influent COD concentration to be 6000-8000mg / L and the organic load to be higher than 1.5 kg / (m < 3 >. D); secondly, a trace amount of O2 is added into the system according to a set proportion, and the amount of added oxygen is maintained between 33 gO2 / kgCOD and 150 gO2 / kgCOD; meanwhile, adding exogenous nitrate, and controlling the ratio of C to N to be (20-65): 1; controlling the anaerobic system to carry out recovery culture under the condition of 33 DEG C, and accelerating the formation of a wastewater metabolism intermediate product acetate through the regulation and control of a carbon dioxide reductase gene expression path; and finally, based on the characteristics that the pH and alkalinity are improved, the COD removal rate is recovered to be normal, and the abundance of the acetic acid nutritional methanogens is obviously increased, gradually reducing the nitrate concentration of the inlet water until the normal operation of the reactor is realized. According to the method, O2 is consumed based on facultative bacteria to remove organic matters, H < + > and VFA are consumed through denitrification, the pH is increased, recovery of an anaerobic bioreactor acidification system with the high inflow COD concentration is achieved, operation is easy and convenient, and energy is saved.

Description

technical field [0001] The invention belongs to the technical field of sewage biological treatment, and particularly relates to a method for repairing an acidification system of an anaerobic reactor under the condition of high influent COD concentration. Background technique [0002] Anaerobic biological treatment technology is one of the widely used technologies in the field of sewage treatment. It has the advantages of low sludge yield, recyclable energy, and good economy. There are many factors that affect the performance of anaerobic bioreactors, including pH, temperature, ORP, salinity, etc. Under normal circumstances, the hydrolytic acid-producing bacteria and the methanogenic bacteria maintain a metabolic balance, and the metabolites in the hydrolytic acidification stage can be utilized by the methanogenic bacteria in time, and finally converted into inorganic substances such as methane. However, methanogens are more sensitive to pH, and their suitable pH ranges from...

Claims

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Application Information

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IPC IPC(8): C02F3/28C02F101/30
CPCC02F3/28Y02E50/30
Inventor 丁丽丽张龙任洪强双娅楠王瑾丰吴兵胡海冬
Owner NANJING UNIV
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