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Side-flow enhanced biological phosphorus removal process

A biological phosphorus removal and process technology, applied in biological water/sewage treatment, aerobic and anaerobic process treatment, chemical instruments and methods, etc., can solve the problem of reducing phosphorus recovery efficiency in struvite, secondary pollution, and phosphorus accumulation. Bacteria growth and activity inhibition, etc., to achieve the effect of strengthening the performance and stability of nitrogen and phosphorus removal, reducing the demand for fermentation acid production, and shortening the residence time.

Pending Publication Date: 2020-07-14
XIAN UNIV OF TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the EBPR process is implemented in a specific sewage plant, the growth and activity of phosphorus accumulating bacteria are often inhibited due to the lack of carbon sources in the influent and water quality fluctuations, so that it cannot meet the requirements for continuous and effective phosphorus removal performance, which also makes some Wastewater plants have to rely more and more on chemical phosphorus removal methods
Although the chemical method is simple and efficient, it requires a large amount of medicine, high treatment costs, and produces a large amount of chemical sludge. If it is not handled properly, it will easily cause secondary pollution.
In addition, the method of chemical addition also reduces the recovery efficiency of phosphorus in struvite

Method used

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  • Side-flow enhanced biological phosphorus removal process

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Effect test

Embodiment 1

[0029] A side-flow enhanced biological phosphorus removal process, including primary sedimentation tank, primary sludge fermentation tank, anoxic tank, aerobic tank, secondary sedimentation tank, side-flow pre-anoxic tank and side-flow anaerobic tank, including the following step:

[0030] Step 1: After the wastewater is introduced into the primary sedimentation tank for deposition, the separated sewage is introduced into the anoxic tank, and the separated sludge is introduced into the primary sludge fermentation tank;

[0031] Step 2: The sewage in the anoxic tank is introduced into the aerobic tank, part of the nitrified sludge water discharged from the aerobic tank is returned to the anoxic tank, and the other part of the nitrified sludge water is introduced into the secondary sedimentation tank;

[0032] Step 3: After the nitrification liquid sludge water in the secondary sedimentation tank is separated from the mud water, the supernatant is discharged, part of the sludge ...

Embodiment 2

[0052] Take the sludge from the return section of a sewage treatment plant, after cleaning and domestication, the process of using this process is as follows:

[0053] The first step: the raw sewage enters the anoxic tank, the COD of the raw sewage is 180mg / L, the total nitrogen (TN) is 30mg / L, the total phosphorus (TP) is 6.8mg / L, the water temperature is 23°C, and the hydraulic retention of the anoxic tank is The time (HRT) is 1.9h, and the sludge concentration is 3500mg / L;

[0054] The second step: the aerobic pool accepts the mud-water mixture discharged from the anoxic pool, the HRT of the aerobic pool is 7.7h, the dissolved oxygen (DO) is greater than 2mg / L, and the reflux ratio of the nitrifying liquid is 300%;

[0055] Step 3: The mud-water mixture discharged from the aerobic tank 4 enters the secondary sedimentation tank for mud-water separation. The sedimentation time of the secondary sedimentation tank is 1.9 hours, and the sludge concentration is 8000mg / L;

[0056...

Embodiment 3

[0060] The first step: the raw sewage enters the anoxic tank, the COD of the raw sewage is 250mg / L, the TN is 40mg / L, the TP is 10mg / L, the water temperature is 23°C, the HRT of the anoxic tank is 1.9h, and the sludge concentration is 3200mg / L L;

[0061] Step 2: The aerobic pool accepts the mud-water mixture discharged from the anoxic pool. The HRT of the aerobic pool is 7.7h, DO is greater than 2.7mg / L, and the reflux ratio of nitrifying liquid is 300%;

[0062] Step 3: The mud-water mixture discharged from the aerobic tank enters the secondary sedimentation tank for mud-water separation. The sedimentation time of the secondary sedimentation tank is 1.9 hours, and the sludge concentration is 8200mg / L;

[0063] Step 4: After the mud-water separation in the secondary settling tank, the supernatant is directly discharged from the system, and the precipitated activated sludge is divided into two parts, one part is discharged from the system as residual sludge, and the other part...

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Abstract

The invention belongs to the technical field of biological sewage treatment, and particularly relates to a side-flow enhanced biological phosphorus removal process which comprises the following steps:1, introducing wastewater into a primary sedimentation tank for sedimentation, introducing separated sewage into an anoxic tank, and introducing separated sludge into a primary sedimentation sludge fermentation tank; 2, introducing the sewage in the anoxic tank into an aerobic tank, refluxing part of nitrification liquid mud water discharged from the aerobic tank to the anoxic tank, and introducing the other part of nitrification liquid mud water into a secondary sedimentation tank; 3, after sludge-water separation is conducted on nitrification liquid sludge-water in the secondary sedimentation tank, discharging the supernatant outwards, discharging part of sludge outwards, and enabling the other part of sludge to flow back to the bypass flow pre-anoxic tank; and 4, adding a primary sludge fermentation supernatant into the bypass flow pre-anoxic tank, carrying out a mixing reaction, allowing the obtained reaction product to enter a bypass flow anaerobic tank, and discharging sludge after being fermented in the bypass flow anaerobic tank to enter a main flow anoxic tank. The process gets rid of or reduces dependence on a water inlet carbon source to a certain extent, and the phosphorus removal effect and stability of the process are improved.

Description

technical field [0001] The invention belongs to the technical field of sewage biological treatment, and in particular relates to a side-flow enhanced biological phosphorus removal process. Background technique [0002] With the rapid development of production industry and urbanization and the growth of population, the discharge of all kinds of domestic and industrial sewage is increasing day by day, the problem of eutrophication of water body is becoming more and more serious, and the situation of water pollution is becoming more and more serious, which makes the form of my country's water resource crisis more severe. . Among them, the discharge of nitrogen and phosphorus nutrients is the main reason for the eutrophication of the receiving water body. [0003] At present, the removal methods of phosphorus in wastewater are mainly divided into chemical method and biological method. The chemical method is mainly to add some chemical agents to the wastewater, the common ones a...

Claims

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Application Information

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IPC IPC(8): C02F3/30
CPCC02F3/308
Inventor 王东琦郑兴张喆张胜威
Owner XIAN UNIV OF TECH
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