AU2020100706A4 - A membrane bioreactor system for rural decentralized wastewater - Google Patents

A membrane bioreactor system for rural decentralized wastewater Download PDF

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Publication number
AU2020100706A4
AU2020100706A4 AU2020100706A AU2020100706A AU2020100706A4 AU 2020100706 A4 AU2020100706 A4 AU 2020100706A4 AU 2020100706 A AU2020100706 A AU 2020100706A AU 2020100706 A AU2020100706 A AU 2020100706A AU 2020100706 A4 AU2020100706 A4 AU 2020100706A4
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membrane
rural
sewage
reduces
technology
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AU2020100706A
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Hongyi Cao
Yuxin Niu
Hongji SU
Ruize Wu
Yuxi Yang
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Cao Hongyi Miss
Niu Yuxin Miss
Su Hongji Miss
Wu Ruize Mr
Yang Yuxi Miss
Original Assignee
Cao Hongyi Miss
Niu Yuxin Miss
Su Hongji Miss
Wu Ruize Mr
Yang Yuxi Miss
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/28—Anaerobic digestion processes
    • C02F3/2853—Anaerobic digestion processes using anaerobic membrane bioreactors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/14—Ultrafiltration; Microfiltration
    • B01D61/145—Ultrafiltration
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/1205—Particular type of activated sludge processes
    • C02F3/121—Multistep treatment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/1236—Particular type of activated sludge installations
    • C02F3/1268—Membrane bioreactor systems
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F2001/007—Processes including a sedimentation step
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/002—Grey water, e.g. from clothes washers, showers or dishwashers
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/005—Black water originating from toilets
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/1236—Particular type of activated sludge installations
    • C02F3/1242—Small compact installations for use in homes, apartment blocks, hotels or the like
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Abstract

With the development of rural economy and continuous improvement of living standards, rural sewage pollution has gradually increased, and the pollution area has gradually increased. The invention aims at the rural decentralized domestic sewage, and develops a rural decentralized integrated membrane bioreactor system. The invention is a hybrid of a conventional biological treatment system and physical liquid-solid separation using membrane filtration in one system, which not only eliminates the need for secondary clarifiers, but also greatly improves the solid-liquid separation efficiency and the biochemical reaction rate. The invention combines a new type of ultrafiltration membrane technology and biological simulation technology. According to the quality and fluctuations of the water, using flate membrane, the membrane flux is increased by more than 30%, and the contact angle is reduced to less than 70 degrees, which optimizes the energy consumption of the equipment and reduces Remaining sludge. Recirculation is performed by air stripping to convert the air energy into the kinetic energy of the reflux liquid. The invention reduces the sludge return pump in the process, saves 30% energy consumption compared with the traditional process, and reduces the equipment failure rate. Domestic sewage [Grille filtering Adjust the pool I Facultative I reaction tank treatment pool Aerationfan Drainage Figure 1 I2\ Figure 2

Description

DESCRIPTION
TITLE
A membrane bioreactor system for rural decentralized wastewater treatment
FIELD OF THE INVENTION
This patent is in the field of sewage treatment in water treatment technology, and particularly relates to a membrane organism reactor.
BACKGROUND OF THE INVENTION
With the rapid improvement of urban sewage treatment rate, China has established a relatively complete technical system and management system for centralized sewage treatment, but there is still a large gap in rural decentralized domestic sewage treatment. Foreign research on decentralized rural sewage treatment has been carried out earlier. Currently, 20% to 30% of the population in Europe and the United States uses decentralized sewage treatment facilities, and 66% of the population in Japan uses purification tank technology. Decentralized processing technology has matured in these countries. However, China began to explore and practice decentralized wastewater treatment technology in the 1980s. The constructed wetland, stabilization pond, trickling filter, and Anaerobic-aerobic combination process has been studied and applied in rural areas of China. With the introduction of Action Plan for Prevention and Control of Water Pollution and Three-year action plan for the
2020100706 05 May 2020 improvement of rural human settlements, people are paying more and more attention to the decentralized sewage treatment in rural areas. Carrying out the treatment of rural domestic sewage is to change the current situation of disorderly discharge of rural domestic sewage and improve the living conditions of farmers. It is an important task to improve the living environment in rural areas, and it is also the key to improving the water environment in river basins and regions.
At present, there are dozens of forms of decentralized rural sewage treatment technologies in China, such as constructed wetlands, aerobic biological contact oxidation processes, trickling filters, anaerobic biogas digester treatment technologies, small secondary sewage treatment devices, and membrane bioreactors. Constructed wetlands are artificial ecosystems modeled on natural wetlands, using the triple synergy of physical, chemical, and biological in the natural ecosystem to achieve the purification of sewage. In the aerobic biological contact oxidation treatment process, sewage flows through the filler with microorganisms attached. During the contact with the filler, the organic pollutants in the sewage are removed through the metabolism of the aerobic microorganisms to achieve sewage purification. The trickling filter is a biological treatment structure composed of crushed stone or plastic product filler. By imitating the principle of natural ecosystem, the synergy
2020100706 05 May 2020 of microorganisms, artificial fillers and biofilms is used to purify sewage. Anaerobic biogas digester treatment technology uses human and animal manure or crop straws to convert organic matter into methane and carbon dioxide by anaerobic and facultative microorganisms under the condition of hypoxia in the biogas digester. The small secondary sewage treatment device uses a combination of physical and biological methods for sewage treatment. Sewage first enters biological treatment such as anaerobic, facultative or aerobic after passing through the grille, primary sedimentation tank, and finally discharged through sedimentation. Membrane Bioreactor (MBR, Membrane Bioreactor) is an efficient and new sewage treatment technology formed by combining membrane separation technology and activated sludge system. There are various forms of decentralized sewage treatment technology in rural areas. Therefore, how to scientifically choose a sewage treatment process, and at the same time, based on the rural conditions, fully consider the construction and development of surrounding towns and industrial areas, formulate a suitable planning scheme deserves our attention. For more developed and land-stressed areas, the research and development of miniaturized integrated membrane bioreactor technology is particularly important.
Therefore, this patent has developed a set of rural decentralized integrated
2020100706 05 May 2020 membrane bioreactor system, including anaerobic tank, membrane bioreactor, clean-water reservoir, aeration blower, suction pump and splitter plates, and applied this system to China Regions such as Jiangsu and Zhejiang. The system not only has the technological advantages of the original membrane bioreactor, but also is convenient to use. It can carry out the evolutionary treatment of sewage from scattered households, and improves the flexibility of sewage treatment. Therefore, this system has an important role and promotional value for improving the quality of rural water environment in China.
SUMMARY
MBR technology is suspension culture biological treatment (activated sludge process) and the combination of membrane separation technology, membrane separation technique to replace the two pond, in the traditional activated sludge process, plays the biological treatment technology rely on microorganisms (mixture) separated from the culture medium, and microbes to insourcing stay in biochemical reaction pool, at the same time ensure that basically out of the water does not contain microbes and other suspended matter. The membrane bioreactor can effectively overcome the limitation related to the sludge settling performance and replace the secondary sedimentation tank. MBR can maintain a high biomass concentration, usually 8 ~ lOg/L for MLSS, up to 10 ~ 15g/L,
2020100706 05 May 2020 and 3 ~ 5g/L for MLSS in conventional activated sludge aeration tank. Therefore, the footprint of MBR process is only 1/2 ~ 1/3 of that of conventional treatment.
The sewage in the invention is led to the sewage treatment equipment through the sewage collection pipeline, and the sewage is first filtered through the grille and then sent to the regulating tank by the lifting pump, and then continuously sent to the integrated sewage purification equipment by the lifting pump.In integrated sewage purification equipment in the pool of oxygen and the biochemical degradation, and degradation of organic pollutants, the bottom aeration device, microbial needed oxygen provided by the equipment inside the blower, system through the mixture flow, use of denitrifying bacteria degradation of ammonia nitrogen, water entering the MBR membrane pool further degradation of filtering, spate separation, discharge standard after discharge.
DESCRIPTION OF DRAWING
Figure 1 is technical route description.
Figure 2 is the flow diagram of the MBR process.
Figure 3 is the schematics design of our invention.
2020100706 05 May 2020
DESCRIPTION OF PREFERRED EMBODIMENT
Principle
The Figure 1 illustrates a type of membrane bioreactor which consists of an anaerobic tank 1, a membrane bioreactor tank 2, a clearwater holding tank 3, an aerator 8, a suction pump 9,and and an isolation plate. The anaerobic tank 1 and the membrane bioreactor tank 2 are isolated by an isolation plate, and the membrane bioreactor tank 2 and the clearwater holding tank 3 are isolated by an isolation plate. The anaerobic tank 1 is provided with an anaerobic tank aeration pipe 7 and a water inlet pipe 12. An MBR membrane module 11 is arranged in the membrane bioreactor tank 2, and a membrane module aeration pipe 5 is arranged at the bottom of the MBR membrane module 11. A clearwater holding tank 3 is inserted with an outlet pipe 13. The anaerobic tank aeration pipe 7 and the membrane module aeration pipe 5 control aeration by an aerator 8, and the water outlet pipe 13 performs water outlet through a suction pump 9.
A sedimentation tank 4 is set on the other end of the water inlet pipe 12.
A feed pump 10 is set on the water inlet pipe 12.
An overflow port 6 is set near the top of the isolation plate between the anaerobic tank 1 and the membrane biological reaction tank 2.
In the process of use, the membrane bioreactor is installed in a container
2020100706 05 May 2020 and placed in the decentralized residence. The sewage is introduced into the sedimentation tank 4 through a pipeline for sedimentation, and then the precipitated sewage is sent to the anaerobic tank 1 for aeration through a water inlet pipe 12 by a feed pump 10, and then the aerated wastewater in the anaerobic tank 1 flows into the membrane bioreactor tank 2 through the overflow port 6, and the MBR membrane module 11 performs sewage purification treatment, and finally The treated sewage is pumped out by the suction pump 9 and sent to the clearwater holding tank 3 by the outlet pipe.
The anaerobic tank aeration pipe 7 is set to provide sufficient oxygen for the anaerobic tank 1 . The setting of the membrane module aeration pipe 5 can facilitate the scouring of the fouling on the MBR membrane module 11, so that the MBR membrane module 11 can maintain stable and effective sewage purification.
Procedure
The procedure of this invention is implemented as follows:
(1) The feed pump starts to feed water, and then the activated sludge, which is taken from the nearby sewage treatment plant, is added to the aerobic tank. The aeration period is 3 days, and the carbon source is added at the same time.
2020100706 05 May 2020 (2) Observe the growth of activated sludge. When the concentration of sludge in the aerobic tank reaches 2000-3000mg L-l, the water will flow out, and a certain amount of denitrifying bacteria will be added to the anoxic tank to improve the nitrification reaction capacity of the system;
(3) The equipment enters and exits the water, replenishes the bacteria at any time. When SV be maintained at about 30%, the installation operates normally.
Results and discussion
Table 1 Characterization of the wastewater before and after treatment.
sample CODcrCmgL1) NH^-Nfing-L1) TPimg-L1) SSfmg-L'1)
1 Feed 813 57.9 11.3 120
Effluent 21 0.512 0.820 16
Removal efficiency% 97.4 99.1 92.7 86.7
2 Feed 243 60.1 10.4 108
Effluent 20 0.616 0.792 11
Removal efftciency% 91.8 99.0 92.4 89.8
3 Feed 481 136 21.7 142
Effluent 21 5.840 0.784 10
Removal efficiency% 95.6 95.7 96.4 93.0
4 Feed 142 42.4 6.54 67
Effluent 5 0.484 0.416 6
Removal efficiency% 96.5 98.9 93.6 91.0
5 Feed 465 91.2 16.7 85
Effluent 10 0.892 0.908 12
Removal efficiency% 97.8 99.0 94.6 85.9
6 Feed 129 52.6 5.23 63
Effluent 24 3.030 0.780 10
Removal efficiency% 81.4 94.2 85.1 84.1
Discharge standard(lB) 60 8(15) 1 20
2020100706 05 May 2020
Analysis
The process achieved good removal efficiency of 81.4%-97.8% of CODcr, 94.2%-99.1% ofNH4+-N, 85.1%-96.4% ofTP, and 84.1%-93.0% of SS, which allowed the effluent quality to meet the IB standard (GB 18918-2002) (e.g., COD, NH4+-N, TP and SS no higher than 60, 8, 1, 20 mg-L·1, respectively)
The study examined the performances of the integrated MBR for rural wastewater reclamation. It was found that in the system 81.4%-97.8% of CODcr, 94.2%-99.1% of NH4+-N, 85.1%-96.4% of TP, and 84.1%-93.0% of SS could be removed, and the treated water quality succeeded to meet the IB standard of Discharge standard of pollutants for municipal wastewater treatment plant(GB 18918-2002). The MBR treatment process provides stable and high quality product water and has low emission amount of sludge. This integrated sewage purification installation has its distinct advantages of high treatment efficiency, ease of construction, and small footprint, thus saving land use and construction costs, which is extremely important for rural areas where limited footprint and financial issues exist. So this novel type of MBR is promising in the foreseeable future.
Table 2 below shows the main parameters of this MBR
Table 2 The main parameters of the installation:
2020100706 05 May 2020
Serial number item factor remark
Integrated sewage purification installation Capacity:5-200ton d_1; Full- automatic PCL control, water pump and water level linkage control; Intelligent alarm; No personnel required.
1 Integrated sewage tank The box material can be divided into carbon steel and glass steel; Carbon steel needs to be anticorrosive paint: epoxy coal asphalt paint.
2 MBR membrane module Flat sheet membrane, membrane pore size: 0.1 pm; Membrane material: polyvinylidene fluoride (PVDF); water production: 400 -bOOLp’d1.
3 Centrifugal pump Self-priming centrifugal pump is selected according to the water production.
4 Vortex air pump The high-pressure vortex air pump is selected according to the required aeration of the membrane module.
5 Level controller Controlling the water level of the membrane pool and the water level of the clearwater holding tank
6 Electronic control system Full- automatic PCL control; Telemonitoring.

Claims (3)

  1. WHAT WE CLAIM IS:
    1. A membrane bioreactor system for rural decentralized wastewater treatment, characterized in that: the equipment has the characteristics of miniaturization and integration, suitable for decentralized treatment of rural sewage, and the quality of the effluent water is high, which can be reused.
  2. 2. According to system of claim 1, wherein integrate new ultrafiltration membrane technology and biological simulation technology; according to the quality and fluctuations of the water, the use of flat membranes has improved the membrane flux by more than 30%, and the contact angle has been reduced to below 70 degrees, optimizing the energy consumption of the equipment and the remaining pollution; very little mud.
  3. 3. According to system of claim 1, wherein backflow can be carried out by air stripping, which converts air energy into reflux liquid kinetic energy, which reduces the sludge return pump in the process; this technology saves 30% energy consumption compared with traditional processes, and reduces equipment failure rate.
AU2020100706A 2020-05-05 2020-05-05 A membrane bioreactor system for rural decentralized wastewater Ceased AU2020100706A4 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113307368A (en) * 2021-05-27 2021-08-27 公安县佳源水务有限公司 Backflow device used in oxidation ditch
CN113666576A (en) * 2021-08-23 2021-11-19 武汉亦非凡建筑工程有限公司 Ecological reconstruction method for rural domestic sewage discharge port
CN114291891A (en) * 2021-12-27 2022-04-08 图方便（苏州）环保科技有限公司 Sewage treatment method based on MBR (membrane bioreactor)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113307368A (en) * 2021-05-27 2021-08-27 公安县佳源水务有限公司 Backflow device used in oxidation ditch
CN113666576A (en) * 2021-08-23 2021-11-19 武汉亦非凡建筑工程有限公司 Ecological reconstruction method for rural domestic sewage discharge port
CN114291891A (en) * 2021-12-27 2022-04-08 图方便（苏州）环保科技有限公司 Sewage treatment method based on MBR (membrane bioreactor)

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