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Treatment system and treatment method for dispersed sewage

A treatment system and decentralized sewage technology, applied in water/sewage treatment, biological water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems of large differences in production conditions, low sewage production, and difficult collection. Achieve long residence time, reduce membrane fouling, and easy operation and management

Pending Publication Date: 2021-09-21
BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of this, the present invention provides a system and method for resource utilization and reuse of rural sewage, aiming at problems such as large differences in rural sewage production conditions, low sewage production, high difficulty in collection, and high treatment costs. Rural sewage is pretreated , integrated membrane concentration and other processes to produce high-purity water, low water yield, higher water quality, and wider uses. The concentrated liquid is processed through anaerobic biogas separation and resource recovery. The effluent can be reused in the system or used for agricultural irrigation, and part of the biogas is removed. Impurities are sent to the biogas tank for storage, used in biogas boilers to provide heat sources for rural production and life, and the remaining part of the biogas is reused in the system for stirring, which highly realizes the in-situ resource utilization of rural sewage

Method used

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  • Treatment system and treatment method for dispersed sewage
  • Treatment system and treatment method for dispersed sewage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0110] see figure 2 , a decentralized sewage treatment system, comprising: a pretreatment unit, a cross-flow filtration unit, a high-efficiency reverse osmosis unit, a medium-pressure reverse osmosis unit, an anaerobic treatment unit, a high-purity water storage unit, and a purified water storage unit;

[0111] The cross-flow filter unit is connected to the water outlet of the pretreatment unit;

[0112] The high-efficiency reverse osmosis unit is connected to the water outlet of the cross-flow filtration unit;

[0113] The medium-pressure reverse osmosis unit is connected to the permeate outlet of the high-efficiency reverse osmosis unit;

[0114] The high-purity water storage unit is connected to the permeate outlet of the medium-pressure reverse osmosis unit;

[0115] The anaerobic treatment unit is connected to the concentrate outlet of the high-efficiency reverse osmosis unit;

[0116] The clean water storage unit is connected to the water outlet of the anaerobic trea...

Embodiment 2

[0137] A kind of method that adopts the decentralized sewage treatment system in embodiment 1 to process sewage, concrete steps are as follows:

[0138] S1: Preprocessing:

[0139] S11: Homogeneous adjustment: Rural sewage enters the homogeneous adjustment tank 1, the hydraulic retention time is t=4h, and the water quantity and quality are adjusted and homogenized. The mixer at the bottom of the pool can evenly stir the sewage to prevent dirt from depositing.

[0140] S12: Microfiltration: The effluent from the homogeneous adjustment tank 1 is pressurized by the microfiltration booster pump 3 and then enters the integrated microfiltration device 4. The sewage first enters the quartz sand filtration area, and then enters the core filter area after sand filtration. Micro-suspended particles, colloids, microorganisms, etc. remaining in the pore filtration water;

[0141] S2: Concentration treatment;

[0142] S21: Cross-flow filtration: After the sewage is processed by the integ...

Embodiment 3

[0150] Using the system of Example 1 and the method of Example 2 as the experimental group for sewage treatment, the influent COD is about 350mg / L, SS is about 150mg / L, TN is about 30mg / L, TP is about 15mg / L, and the operating temperature is about 26°C. The effluent quality of the system is stable: SS<20mg / L, COD<60mg / L, TP removal rate is greater than 80%, TN removal rate is greater than 70%, ammonia nitrogen removal rate is greater than 85%, and the effluent quality can meet the farmland irrigation standard (GB5084-2005). The comprehensive recovery rate of the system can reach 60%-65%, and the effluent can be used as internal circulating water or used for agricultural irrigation, which can highly realize the in-situ resource utilization of rural sewage.

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Abstract

Aiming at the characteristics of large difference of rural sewage generation conditions, low sewage generation amount, large collection difficulty, high treatment cost and the like, the invention provides a treatment system and a treatment method for resource recovery and recycling of rural dispersed sewage, the rural sewage is subjected to the processes of pretreatment, integrated membrane concentration and the like to produce high-purity water, the water yield is low, the water quality is higher, the application is wider, the concentrated liquid is subjected to quality separation through the anaerobic treatment unit and then is subjected to resourceful treatment, the effluent can be recycled to a system or used for agricultural irrigation, one part of biogas is fed into a biogas cabinet to be stored after being subjected to impurity removal and used for a biogas boiler to provide a heat source for rural production and life, and the remaining part of biogas is recycled to the system for stirring so that in-situ resourceful treatment of rural sewage is highly realized.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, and more specifically relates to a decentralized sewage treatment system and treatment method. Background technique [0002] Rural sewage mainly refers to the sewage produced by villagers in rural areas during production and life, including sewage produced by flushing toilets, cooking, laundry, bathing, and domestic captive livestock and poultry. Rural sewage presents the characteristics of a wide range of sources, intermittent, and large differences in water quality and quantity. Most of the rural sewage is not treated or the treatment is not up to standard and directly discharged into the surrounding water bodies, which affects the quality of surface water, damages the ecological environment and endangers human health. [0003] Rural sewage is distributed sewage, and the distribution of residential areas is uneven, which makes the layout of the collection pipe network more difficult, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C10L3/10B01D53/18B01D53/14E03B1/04
CPCC02F9/00C10L3/103B01D53/18B01D53/1406E03B1/041C02F1/001C02F1/441C02F2301/08C02F3/2893C02F2209/44C02F2209/08C02F2209/02C02F2209/03C02F2209/42C02F2209/06C02F2209/05
Inventor 刘建伟陈欣玥
Owner BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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