Continuous flow sewage hypoxia short distance denitrification treating technique

A treatment process and sewage technology, applied in water/sewage treatment, biological water/sewage treatment, multi-stage water/sewage treatment, etc., to ensure the nitrification effect of the system, occupy a small area, and reduce energy consumption

Inactive Publication Date: 2010-07-07
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still few reports on the short-term denitrification of urban sewage by using the continuous flow activated sludge process under low oxygen conditions.

Method used

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  • Continuous flow sewage hypoxia short distance denitrification treating technique

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Embodiment 1

[0023] Embodiment 1: The present invention has been applied to the technical research on upgrading and transforming sewage treatment process of a certain sewage treatment plant. The influent water quality of the sewage treatment plant is: COD 100-245mg / L, ammonia nitrogen 15-25mg / L, total nitrogen 20-35mg / L, and total phosphorus 1.0-4.0mg / L. The present invention sets the hydraulic retention time of anaerobic zone 2 to 1.0 hours in this project, which is the anaerobic phosphorus release section; the hydraulic retention time of anoxic zone 3 is 5.0 hours, and the actual hydraulic retention time is greater than this value due to the adoption of a circulating push-flow system , mainly for short-range nitrification and denitrification; the hydraulic retention time of aerobic zone 4 is 5.0 hours, and further nitrification reaction is carried out, while organic matter degradation and excessive phosphorus uptake by phosphorus-accumulating bacteria are carried out; the sludge reflux ra...

Embodiment 2

[0024] Embodiment 2: The present invention is applied to the productive process technology research of a sewage treatment plant in the south. The influent water quality of the sewage treatment plant is: COD 100-150mg / L, ammonia nitrogen 15-20mg / L, total nitrogen 20-35mg / L, and total phosphorus 1.0-4.5mg / L. The present invention sets the hydraulic retention time of anaerobic zone 2 in this project to be 1 hour, which is an anaerobic phosphorus release section; the hydraulic retention time of anoxic zone 3 is 4.0 hours; the hydraulic retention time of aerobic zone 4 is 4.0 hours, and further carries out nitrification Reaction, simultaneous degradation of organic matter and excessive phosphorus uptake by phosphorus-accumulating bacteria; the sludge reflux ratio is 0.6, and the nitrification liquid reflux ratio is 1.0. After being treated by the process proposed by the invention, the effluent water quality reaches: COD 10-25mg / L, ammonia nitrogen 0.5-2.0mg / L, total nitrogen 10-20m...

Embodiment 3

[0025]Embodiment 3: The present invention has been applied to the upgrading and upgrading of a sewage treatment plant in the north in the research of sewage treatment technology. The influent water quality of the sewage treatment plant is: COD 210-460mg / L, ammonia nitrogen 15-35mg / L, total nitrogen 25-46mg / L, total phosphorus 1.0-5.0mg / L. In this project, the present invention sets the hydraulic retention time of anaerobic zone 2 to 1 hour, which is the anaerobic phosphorus release section; the hydraulic retention time of anoxic zone 3 is 6.0 hours, mainly for short-range nitrification and denitrification; the hydraulic retention time of aerobic zone 4 The time is 5 hours, the nitrification reaction is further carried out, and the organic matter degradation and phosphorus accumulation bacteria are excessively absorbed at the same time; the sludge reflux ratio is 0.8, and the nitrification liquid reflux ratio is 1.5. After being treated by the process proposed by the invention,...

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Abstract

The invention belongs to the technical field of biological sewage treating technique, in particular relates to a continuous flow sewage hypoxia short distance denitrification treating technique. The technique is implemented by a circular flow impelling system, sewage enters into an anaerobic zone through a water inlet pipe, and stays for 50-70min for biological phosphorus release; effluent from the anaerobic zone enters into an anoxic zone and stays for 4-6h with DO value controlled at 0.3-0.7mg / L, and the anoxic zone is provided with a first aeration system to realize anoxia or hypoxia condition to provide conditions for short distance nitrification and denitrification; effluent from the anoxic zone enters into an aerobic zone and stays for 4-6h with DO value controlled at 0.8-1.2mg / L, part of nitrification liquid in the aerobic zone flows back to the anoxic zone with reflux ratio being 0.8-1.5; effluent from the aerobic zone enters into a secondary sedimentation tank for mud-water separation, effluent is discharged at last, part of mud in the secondary sedimentation tank flows back to the anaerobic zone with mud reflux ratio being 0.5-0.8; the aerobic zone is provided with a second aeration system to complete organism degradation and nitrification processes. In the invention, dissolved oxygen, pH and the like are controlled, a hypoxia zone is formed in the anoxic zone, and technologies such as hypoxia short distance nitrification and denitrification, denitrification dephosphorization and the like are utilized, thus realizing the aim of efficiently removing nitrogen and phosphorus from continuous flow activated sludge with energy being saved.

Description

technical field [0001] The invention belongs to the technical field of sewage biological treatment, and in particular relates to a continuous-flow sewage low-oxygen short-range denitrification treatment process. Background technique [0002] With the development of my country's economy, water consumption is increasing, and water pollution is also increasing. Therefore, effective control of water pollution and protection of scarce fresh water resources are directly related to the healthy and rapid development of my country's economy. "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB 18918-2002) has increasingly strict control over the discharge of nitrogen, phosphorus and other nutrient elements. How to improve the denitrification of low C / N ratio sewage in urban sewage biological treatment systems Phosphorus removal efficiency has always been a difficulty. Existing nitrogen and phosphorus removal processes, such as A / A / O, UCT, MUCT, SBR, CASS / CAST, etc.,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/12C02F3/28C02F1/58
CPCY02W10/10
Inventor 王荣昌杨殿海江清华卢文健
Owner TONGJI UNIV
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