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Method for treating domestic sewage by multi-stage biofilm filtration

A technology for domestic sewage and biofilm, applied in sustainable biological treatment, biological water/sewage treatment, chemical instruments and methods, etc., can solve the problems of high operating cost, poor effluent stability, low treatment efficiency, etc., and reduce head loss. , Efficient interception and removal, the effect of reducing the load

Inactive Publication Date: 2010-08-18
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a multi-stage biofilm filtration method for domestic sewage in order to solve the problems of high operating cost, complicated process, poor effluent stability and low treatment efficiency in the existing conventional biofilm treatment process

Method used

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Examples

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specific Embodiment approach 1

[0006] Specific embodiment one: the method for a kind of multi-stage biofilm filtration treatment domestic sewage of this embodiment is realized according to the following steps: 1, domestic sewage is through mechanical pretreatment, carries out pre-aeration and oxygenation again, makes the dissolved oxygen in the sewage reach 2~ 4mg / L, and then enter the first-stage biological coarse filtration reactor, the residence time of sewage is 0.5-2h; Second, the sewage after coarse filtration enters the second-stage upflow double-layer biofilm filter bed under the condition of aeration and oxygenation , The sewage residence time is 0.5~2h; 3. The sewage filtered by the double-layer biofilm enters the third-stage biofilm filtration section, and the sewage treatment is completed.

[0007] In this embodiment, there are microorganisms in the biofilm, and the source thereof is activated sludge inoculation or natural growth.

specific Embodiment approach 2

[0008] Embodiment 2: This embodiment differs from Embodiment 1 in that the pre-aeration and oxygenation in step 1 is performed by pre-blast aeration or falling water aeration. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0009] Specific embodiment 3: The difference between this embodiment and specific embodiment 1 is that in step 1, there is a filler in the biofiltration reactor, the filler is a plastic suspension filler, and the filler dosage rate is 30-70%. Other steps and parameters are the same as those in Embodiment 1.

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Abstract

The invention provides a method for filtering and treating domestic sewage by using a multi-level biomembrane and relates to a method for treating the domestic sewage. The method solves the problems of an existing common biomembrane domestic sewage treatment technology that the operation cost is high, the technology is complex, the output of water is poor in stability and the treatment efficiencyis low. The steps are that: the domestic sewage is pre-treated mechanically, and is pre-aerated for oxygenization, then the domestic sewage is fed into a first level biological prefiltration reactionvessel, the prefiltered sewage is fed into a second level up-flow type double layer biomembrane filtration bed under the aeration and oxygenization condition, the sewage filtered by the double layer biomembrane is fed into a third biomembrane filtration section and the sewage treatment is finished. The invention provides a multi-level biomembrane filtration treatment method of domestic sewage, the technology is simple, the treatment efficiency is high, the output water is good in stability and the operation cost is low.

Description

technical field [0001] The invention relates to a method for treating domestic sewage. Background technique [0002] With the development of my country's economy and the acceleration of urbanization, the problem of water resources has become increasingly prominent. Water shortage and water pollution have become important factors restricting my country's economic development. At present, the conventional biofilm treatment process for domestic sewage includes biological turntable, biological contact oxidation, biotrickling filter, aerated biofilter, and moving bed biofilm method; Fly breeding, effluent water quality is not stable enough, treatment efficiency and operation stability are not high enough; the biological aerated filter process has relatively strict requirements for influent water quality, especially for influent suspended solids (SS). , otherwise, the biological aerated filter is prone to blockage of the filter layer, which shortens the operation period and redu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/10C02F3/12
CPCY02W10/10
Inventor 崔福义刘智晓
Owner HARBIN INST OF TECH
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