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Bypass flow type biological phosphorus removal process

A biological phosphorus removal and process technology, which is applied in the direction of biological sludge treatment, biological water/sewage treatment, aerobic and anaerobic process treatment, etc., can solve the problem of low carbon-phosphorus ratio of influent, increased operating cost, and increased operating cost carbon footprint and other issues, to achieve the effect of promoting denitrification, reducing costs, and improving the performance and stability of nitrogen and phosphorus removal

Pending Publication Date: 2020-08-18
中圣环境科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the carbon-to-phosphorus ratio of influent in some sewage plants is low, which cannot meet the above conditions, and often requires additional commercial carbon sources, which will inevitably increase operating costs
Without continuous and effective BPR performance, sewage plants can only rely more and more on the addition of chemical phosphorus removal chemicals, which also increases operating costs and corresponding carbon footprints

Method used

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  • Bypass flow type biological phosphorus removal process
  • Bypass flow type biological phosphorus removal process
  • Bypass flow type biological phosphorus removal process

Examples

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Effect test

Embodiment 1

[0029] A side-flow biological phosphorus removal process, comprising a primary sedimentation tank, anoxic tank, an aerobic tank, a side-flow pre-anoxic tank, a side-flow anaerobic tank and a secondary sedimentation tank; comprising the following steps:

[0030] Step 1: Introduce the sewage into the anoxic pool, and flow into the aerobic pool through the anoxic pool;

[0031] Step 2: Return part of the nitrified sludge water discharged from the aerobic tank 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 nitrifying liquid sludge water in the secondary settling tank is separated from the mud and water, the supernatant is discharged directly to the treatment system as effluent or after advanced treatment. The sludge is divided into two parts, part of which is discharged outside and part of which is discharged as residual sludge The treatment system realizes biological phosphorus r...

Embodiment 2

[0051]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:

[0052] Step 1: The water temperature of the anoxic pool where the raw sewage enters the mainstream is 23°C, the HRT of the anoxic pool is 2.7h, and the sludge concentration is 3200mg / L;

[0053] Step 2: The aerobic pool receives the mud-water mixture discharged from the anoxic pool. The HRT of the aerobic pool is 10.7h, the DO is greater than 2.0mg / L, and the reflux ratio of the nitrifying liquid is 300%;

[0054] 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 2.7 hours, and the sludge concentration is 7800mg / L;

[0055] Step 4: After the mud-water separation in the secondary settling tank, the supernatant is directly discharged from the system; the settled sludge after passing ...

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Abstract

The invention particularly relates to a bypass flow type biological phosphorus removal process. The process comprises the following steps: step 1, feeding sewage into an anoxic tank, and enabling thesewage to flow into an aerobic tank through the anoxic tank; 2, enabling a part of nitrification liquid mud water discharged from the aerobic tank to flow back to the anoxic tank again, and the otherpart of nitrification liquid mud water to flow into a secondary sedimentation tank; 3, after mud-water separation of nitrification liquid mud water in the secondary sedimentation tank, directly discharging supernatant out of the treatment system as effluent or subjected to advanced treatment, discharging a part of sludge, discharging another part of sludge out of the treatment system as excess sludge to realize biological phosphorus removal, and the other part of sludge respectively flows back to the anoxic tank and the bypass flow pre-anoxic tank according to a certain proportion; 4, uniformly mixing the sludge in the bypass flow pre-anoxic tank and then feeding the sludge into a bypass flow anaerobic tank, so that the sludge is subjected to deep fermentation in the bypass flow anaerobictank and then flows back to the anoxic tank. By means of the process, the dependence of phosphorus-accumulating bacteria on a water inlet carbon source is reduced, and more carbon sources can be obtained by denitrifying bacteria, so that an external commercial carbon source does not need to be added.

Description

technical field [0001] The invention belongs to the technical field of sewage biological treatment, and in particular relates to a side-flow biological phosphorus removal process. Background technique [0002] Up to now, water eutrophication is still one of the major water pollution problems facing the world. With the continuous improvement of urbanization level and the development of industrial technology, a large amount of domestic sewage and industrial wastewater are discharged into rivers, lakes, reservoirs and sea estuaries, causing eutrophication of receiving water bodies and seriously affecting the quality of water environment. Phosphorus is the key factor causing water eutrophication, so to control water eutrophication and improve water ecological environment, it is necessary to strictly control the phosphorus content discharged into water bodies. [0003] Phosphorus is mostly removed by biological and chemical methods. The chemical method needs to add chemical pho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30C02F11/04
CPCC02F3/30C02F3/308C02F11/04
Inventor 郭治敏王东琦郑兴
Owner 中圣环境科技发展有限公司
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