Sectionalized sewage treatment tank using cyclic activated sludge system

A technology for circulating activated sludge and sewage treatment pools, applied in water/sludge/sewage treatment, biological water/sewage treatment, sustainable biological treatment, etc., can solve high energy consumption, low nitrogen and phosphorus removal efficiency, etc. problems, to achieve the effect of improving phosphorus removal and high biological phosphorus removal efficiency

Active Publication Date: 2012-11-21
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0005] In order to overcome the problems of low denitrification and phosphorus removal efficiency and high energy consumption by the circulating activated sludge process, the object of the present invention is to provide a sewage treatment pool by the zonal circulating activated sludge process, by setting different areas in the pool, respectively Create the most suitable environment and conditions for phosphorus accumulating bacteria, denitrifying bacteria and nitrifying bacteria. At the same time, the activated sludge circulates in different areas in the tank to complete the release of phosphorus, denitrification and nitrification respectively, so as to achieve efficient denitrification and phosphorus removal. Purpose

Method used

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  • Sectionalized sewage treatment tank using cyclic activated sludge system
  • Sectionalized sewage treatment tank using cyclic activated sludge system
  • Sectionalized sewage treatment tank using cyclic activated sludge system

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Embodiment 1

[0022] A university park is designed to use the partitioned circulating activated sludge method of the present invention to treat domestic sewage in the campus area. The reaction pool is 24m long, 8m wide, 5.5m deep, and has a total volume of 1056m 3 , the volumes of pre-anaerobic zone 3 and anaerobic zone 4 are 88m3 respectively, the volume of anoxic zone 5 is 176m3, the volume of aerobic zone 6 is 704m3, the sum of anaerobic zone and anoxic zone and the volume of aerobic zone The ratio is 1:2, and the anoxic zone 5 adopts figure 2 In the shown discrete structure, the anoxic zone is formed by two reaction pools, and each of the four reaction pools in the anaerobic zone and the anoxic zone is equipped with one agitator with a power of 0.5KW. The COD concentration of sewage entering the treatment system is 300-500mg / L, the total nitrogen is 40-60mg / L, and the total phosphorus is 3-6mg / L. The COD concentration of the treated effluent is 30-50mg / L, the total nitrogen is 10-15mg...

Embodiment 2

[0024] The design of a sewage treatment plant adopts figure 1 The shown circulating activated sludge process (CASS) treats municipal sewage, and the volume ratio of the designed anaerobic zone 4 and aerobic zone 6 is 1:8. The COD concentration of urban sewage entering the treatment system is 300-500mg / L, the total nitrogen is 40-60mg / L, and the total phosphorus is 3-6mg / L. Since the returned sludge contains a large amount of nitrate, the concentration of nitrate in the anaerobic zone is maintained at about 3mg / L, almost no phosphorus is released, the concentration of COD in the effluent after treatment is 30-50mg / L, and the total nitrogen is 15. ~20mg / L, total phosphorus 1~2mg / L, which can only meet the secondary standard of the national urban sewage treatment plant pollutant discharge standard GB18918-2002.

[0025] Adopt the structure ( image 3) for transformation, the volume ratio of the sum of the transformed anaerobic zone 4 and anoxic zone 5 to the aerobic zone 6 is 1...

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Abstract

The invention discloses a sectionalized sewage treatment tank using a cyclic activated sludge system. The sewage treatment tank comprises a tank body; the tank body is provided with a water inlet, a water outlet and a surplus sludge discharge outlet and is partitioned by division plates into a pre-anaerobic zone, an anaerobic zone, an anoxic zone and an aerobic zone which are of different volumes, wherein the volume of the aerobic zone is greater than the volume of the anoxic zone, and the volume of the anoxic zone is greater than the volume of the anaerobic zone; stirrers are respectively arranged in the pre-anaerobic zone, the anaerobic zone and the anoxic zone; an aeration device, an aerobic sludge circulating pump and a water decanter are installed in the aerobic zone; sludge flows back in two stages, wherein the sludge is recycled from the aerobic zone to the anoxic zone in the first stage and then flows back from the anoxic zone to the pre-anaerobic zone in the second stage. According to the invention, sectionalized and staged cycling of the sludge enables anaerobic and anoxic states to be optimal, phosphorus accumulating organisms, anti-denitrifying bacteria and nitrobacteria in the sludge can realize phosphorus removal and nitrogen removal under optimal conditions, and therefore, a good nitrogen, phosphorus and organic matter removal effect is achieved.

Description

technical field [0001] The invention relates to a sewage treatment pond by activated sludge method, in particular to a sewage treatment pond by zonal circulation activated sludge method. The sewage treatment pond is more suitable for biological denitrification and phosphorus removal of domestic sewage or urban sewage. Background technique [0002] Cyclic Activated Sludge System (CASS) is one of the main methods for domestic sewage and urban sewage treatment. This process was invented in 1989 by Goronszy of Trans Enviro Company in the United States. It is a major improvement on the Sequencing Batch Reactor (also known as SBR), which retains the small investment, low operating cost and flexibility of the SBR process. At the same time, due to the increase of the selection pool, the expansion of filamentous bacteria commonly present in activated sludge can be inhibited. Therefore, activated sludge with better sedimentation performance can be obtained, which is the main method of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/12C02F3/30
CPCY02W10/10
Inventor 彭党聪任勇翔韩芸杨永哲于莉芳
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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