Filter tank type membrane bioreactor

A membrane bioreactor and filter technology, applied in the field of environmental protection, can solve the problems affecting the stable operation of the system, the energy consumption service life and replacement frequency, the low removal rate of total nitrogen and total phosphorus, and the increase in the viscosity of the sludge mixture. problems, to reduce membrane fouling, improve effluent quality, and reduce replacement frequency.

Inactive Publication Date: 2009-03-25
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

[0003] The biological treatment unit of the known membrane bioreactor mostly adopts the activated sludge method. Due to the high-efficiency interception effect of the membrane, it can maintain a high sludge concentration in the bioreactor. On the one hand, it can strengthen the removal of pollutants, but on the other hand On the one hand, it will also have a negative impact on the membrane flux, increase the viscosity of the sludge mixture, and aggravate membrane fouling.
It will lead to a continuous decrease in membrane flux, and at the same time affect the stable operation of the system, energy consumption, service life and replacement frequency of the membrane, which is directly related to the economics of the membrane bioreactor process
At present, there are many studies on the operation mode of the process in reducing membrane fouling, such as controlling the aeration rate, using a constant subcritical flux, intermittent water discharge, etc., but not much research on the bioreactor
In addition, the membrane bioreactor has a high removal rate for chemical oxygen demand (COD), but not a high removal rate for total nitrogen and total phosphorus. Black and smelly

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  • Filter tank type membrane bioreactor
  • Filter tank type membrane bioreactor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: Domestic sewage enters the pretreatment tank 1 (regulating tank), and then is sent to the biofilter 2 by water pumps, and the top of the biofilter has a water supply pipeline 9 with a drip hole connected to the sewage tank 1, which is intermittently supplied to the biological Filter tank water supply; water passes through the adsorption and filtration of the filter layer 5 composed of zeolite, granular activated carbon and mineralized garbage mixture, penetrates into the supporting layer, and reaches the porous support plate 8 through the mesh cloth 6 and gravel layer 7, and then seeps into the The sump 3, the water in the sump is sent to the cross-flow membrane module 4 through the water pump 12 for filtration, and the clean water is discharged through the clear water pipe 10, and the water quality can reach the "Urban Wastewater Recycling Urban Miscellaneous Water Quality" (GB / T18920) Standard, the concentrated liquid enters the biofilter through the retu...

Embodiment 2

[0029] Example 2: A certain fluorescent penetrant wastewater enters the pretreatment pool 1 (oxidation pool, adding fenton reagent for oxidation), and then pumped to the biofilter, and then enters the membrane module for filtration after passing through the sump. After one year of operation and testing , see Table 1 for the treatment effect.

[0030] Table 1 Influent and effluent water quality and treatment effect of a fluorescent penetrant wastewater

[0031] water quality index Influent (mg / L) Effluent (mg / L) Removal rate (%) COD 4630 104 97.8 Petro 820 6 99.3 Chroma 400 4 99

Embodiment 3

[0032] Example 3: A landfill leachate enters the pretreatment tank 1 (anaerobic tank), then is pumped to the biofilter, and enters the membrane module after the sump for filtration. After one year of operation and testing, the treatment The effect is shown in Table 2.

[0033] Table 2 Water quality and treatment effect of leachate in and out of a landfill site

[0034] water quality index Influent (mg / L) Effluent (mg / L) Removal rate (%) COD 3850 120 96.9 BOD 5 860 20 97.7 NH 3 -N 1100 16 98.5 TN 1425 235 83.5 TP 15.4 0.15 99 SS 5550 20 99.6

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Abstract

A filter type membrane bioreactor comprises a biofilter, a receiving pool and a membrane module, and the biofilter is divided into a filter layer and a supporting layer; the filter layer is made from active filter material with high absorbability and biological adhesiveness and the filter material is a mixture made up of zeolite, granular activated carbon and aged refuse; the supporting layer comprises net sand cloth, a gravel layer and a porous backing plate from top to down, the grain size of the gravel layer gradually increases from top to down; the top of the biofilter is provided with a water supply pipe, on which a pump is arranged and which is connected with a pretreatment basin and provided with a weeper or connected with a sprayer; the receiving pool is arranged below the biofilter, the water pipe of the receiving pool is connected to the membrane module by the pump, a clean water pipe is connected above the membrane module, facilitating the discharge or reuse of clean water, and a backflow pipe is connected below the membrane module and connected with the water inlet of the biofilter, thus forming a cycling treatment system. The device of the invention is characterized by rich filter material sources, big filter flux, the reduction of membrane fouling and energy consumption, as well as high denitrification and dephosphorization efficiency.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a filter type membrane bioreactor for water treatment. Background technique [0002] Membrane bioreactor is a biochemical water treatment system that combines high-efficiency membrane separation technology and activated sludge bioreactor. It is considered to be one of the most promising high-tech technologies in the field of water treatment in the 21st century. Compared with the traditional sewage biochemical treatment technology, the membrane bioreactor has good solid-liquid separation effect, high biochemical efficiency and pollutant removal efficiency, low residual sludge yield, and strong shock load resistance; the system can all realize programmable control It has the advantages of centralized automatic control by PLC (PLC), flexible and stable operation control, and simple and convenient management and maintenance. [0003] The biological treat...

Claims

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Application Information

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IPC IPC(8): C02F3/02C02F3/10
CPCY02W10/10
Inventor 任防振徐国勋
Owner UNIV OF SHANGHAI FOR SCI & TECH
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