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Method for employing anaerobic-aerobic combined biological filter to process domestic sewage

An anaerobic biological filter and domestic sewage technology, which is applied in the field of domestic sewage treatment, can solve the problems of difficulty in reaching, poor effluent quality, and poor P and N removal effect, and achieves easy cleaning, improved effluent quality, and good efficiency. Effect

Inactive Publication Date: 2009-08-26
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention solves the problem that the existing domestic sewage treatment process has poor effect of P and N removal and poor effluent quality, and it is difficult to meet the standard of "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB 18918-2002) which is being implemented in my country , and then provides a method of using anaerobic-aerobic combined biological filter to treat domestic sewage

Method used

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  • Method for employing anaerobic-aerobic combined biological filter to process domestic sewage

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specific Embodiment approach 1

[0015] Specific embodiment one: the method for treating domestic sewage using anaerobic-aerobic combined biofilter described in this embodiment is realized according to the following steps:

[0016] Step 1. The sewage to be treated enters the pretreatment system. The sewage to be treated enters the swirl grit chamber 3 on the pretreatment system after the large debris is intercepted by the grille in the pretreatment system. The hydraulic power of the swirl grit chamber 3 The surface load is controlled at 130~140m 3 / m 2 h and keep the hydraulic retention time at 40-50s;

[0017] Step 2. The sewage treated in step 1 flows into it from the lower part of the Efficient biological-floc filtering and precipitation device in the way of water distribution upward, and forms a layer of suspension in the biological-floc filtering sedimentation tank. Sludge layer 7 (suspended sludge layer 7 can be formed by adjusting the rising flow rate of influent), and the suspended solids and 80% (b...

specific Embodiment approach 2

[0021] Specific embodiment two: the method for processing domestic sewage described in this embodiment also includes step six: filter tank backwashing step: after stopping water inflow, at first use backwash fan 21, backwash trachea 22 to BIOFOR anaerobic biological filter Carry out gas backwashing with BIOFOR biological aerated filter; then open backwash water pump 23 and corresponding valve, utilize the clear water flowing out from the upper part of BIOFOR biological aerated filter to BIOFOR anaerobic biological filter and BIOFOR biological aerated filter Carry out air-water backwashing; After air-water backwashing, first only close backwash fan 21, do not close backwash water pump 23, carry out water backwashing (rinsing); Above-mentioned backwash waste water is collected and returned to the pretreatment system At the water inlet. Air backwashing mainly serves the purpose of loosening the filter material. Air-water backwashing is the main step of the backwashing procedure. ...

specific Embodiment approach 3

[0022] Specific implementation method three: In this embodiment, when backwashing the BIOFOR anaerobic biological filter and the BIOFOR aerated biological filter, the control water backwashing intensity is 20m 3 / (m 2h), gas backwash intensity 50m 3 / (m 2 h); the ratio of air backwash time: air-water backwash time: water backwash time is 1:5:2. Both BIOFOR anaerobic biological filter and BIOFOR aerated biological filter adopt three steps of air backwash, air-water backwash and water backwash for backwashing. The backwash time of BIOFOR anaerobic biological filter is 40min, and the backwash cycle is 24h. The backwash time of BIOFOR biological aerated filter is 40min, and the backwash cycle is 60h. Other steps are the same as in the second embodiment.

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Abstract

A method for employing anaerobic-aerobic combined biological filter to process domestic sewage relates to a method for processing domestic sewage. The invention solves the problems of poorer effects for removing P and N, poor effluent quality, and being hard to achieve the regulated discharge standard of the existing domestic sewage processing technique. The detail steps of the invention are as follows: the domestic sewage enters a pre-processing system, a biological flocculating constituent filter sedimentation tank, a BIOFOR anaerobic biological filter, a BIOFOR aeration biological filter, and an ultraviolet disinfecting device in sequence and then is discharged. The BIOFOR anaerobic biological filter is mainly used for denitrifying denitrification under the anaerobic conditions; the BIOFOR aeration biological filter is mainly used for removing the ammonia nitrogen and rest COD in the water and accomplishing the chemical P removing in the BIOFOR aeration biological filter. The invention employs the combination of the BIOFOR anaerobic biological filter and the BIOFOR aeration biological filter to process the domestic sewage; the P and N removing effects are good and the rest mud amount is less. Various indexes of the processed water body all can achieve the regulated standard and can completely realize automatization control.

Description

technical field [0001] The invention relates to a method for treating domestic sewage. Background technique [0002] The "Discharge Standards of Pollutants for Urban Sewage Treatment Plants" (GB 18918-2002), which is being implemented in my country, puts forward higher requirements for the removal of P and N. However, the activated sludge method in the existing urban sewage treatment is difficult to achieve this goal. Therefore, it is necessary to build a new sewage plant or transform the existing sewage plant to have the function of removing P and N. At the same time, with the acceleration of urban development and the expansion of urban areas, sewage treatment facilities are getting closer to urban areas, and some are even built in urban areas. Therefore, land use for sewage plants is strictly restricted. Traditional sewage treatment plants inevitably produce peculiar smell and noise, and occupy a large area. Due to the above objective needs, it is necessary to find new...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/30C02F1/32C02F1/52
Inventor 韩洪军胡宏博林杉李雨菲张凌瀚
Owner HARBIN INST OF TECH
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