CN-116768397-B - Integrated device and method for advanced sewage treatment by utilizing advanced oxidation coupling reverse osmosis membrane

CN116768397BCN 116768397 BCN116768397 BCN 116768397BCN-116768397-B

Abstract

The invention discloses an integrated device for advanced treatment of sewage by utilizing advanced oxidative coupling reverse osmosis membrane technology, which achieves the effect of well removing ammonia nitrogen, chloride ions and organic matters by arranging an electrooxidation pond, an ozone oxidation pond and a reverse osmosis membrane pond, does not need to additionally add medicaments, can effectively avoid secondary pollution, has high removal rate, stable operation, convenient management and maintenance, and has excellent economic benefit and environmental protection advantage. The invention also discloses a method for treating sewage by using the device.

Inventors

LI ZIYANG
GE XIAOGUANG
Tan Cuiqian
ZHANG JIANLIANG
Kong Zeren
HUANG SHIXIANG
WANG GELAI
ZENG XINZE

Assignees

广东省交通规划设计研究院集团股份有限公司

Dates

Publication Date: 20260505
Application Date: 20230625

Claims (9)

1. A method for treating sewage by utilizing an integrated device for advanced sewage treatment by using an electrooxidation coupling reverse osmosis membrane technology is characterized by comprising the following steps: a) During the peak period of sewage treatment, sewage in the water storage tank (1) enters the reverse osmosis membrane tank (8) through a third outlet end, concentrated solution generated by the reverse osmosis membrane tank (8) flows back to the ozone oxidation tank (10) through the lift pump (7), the control valve (2) and the flowmeter (3), sewage treated by the ozone oxidation tank (10) flows into the second buffer tank (62), pressurized by the lift pump (7) flows into the reverse osmosis membrane tank (8), filtered by the reverse osmosis membrane tank (8), the generated concentrated solution returns to the ozone oxidation tank (10) again, is subjected to ozone oxidation by the ozone oxidation tank (10), returns to the reverse osmosis membrane tank (8) through the second buffer tank (62), and so on until the sewage treatment is in a non-peak period; b) During the non-peak period of sewage treatment, the concentrated solution generated in the reverse osmosis membrane tank (8) flows back to the electrooxidation tank (4) through the lifting pump (7), the control valve (2) and the flowmeter (3), organic pollutants are thoroughly mineralized by electrooxidation, sewage treated by the electrooxidation tank (4) flows into the first buffer tank (61), the sewage flows into the reverse osmosis membrane tank (8) under pressure through the lifting pump (7), the generated concentrated solution is filtered by the reverse osmosis membrane tank (8), the generated concentrated solution returns to the electrooxidation tank (4) again, the oxidized concentrated solution returns to the reverse osmosis membrane tank through the first buffer tank (61) after being oxidized by the electrooxidation tank (4), and the like until the peak period of sewage treatment, wherein the effluent of the reverse osmosis membrane tank flows into the reclaimed water recycling tank to be used as reclaimed water recycling; wherein utilize advanced oxidation coupling reverse osmosis membrane technique advanced treatment sewage's integrated device includes: The device comprises a water storage tank (1), an electrooxidation tank (4), a power supply (5), an ozone oxidation tank (10), an ozone generator (11), a first buffer tank (61), a second buffer tank (62), a reverse osmosis membrane tank (8), a reclaimed water recycling tank (9) and an automatic control mechanism (13); The water storage tank (1) is provided with four outlet ends, wherein a first outlet end and a third outlet end are respectively connected with the inlet end of the reverse osmosis membrane tank (8) through a pipeline, a second outlet end is connected with the first inlet end of the electrooxidation tank (4) through a pipeline, and a fourth outlet end is connected with the first inlet end of the ozone oxidation tank (10) through a pipeline; a control valve (2), a flowmeter (3) and a lifting pump (7) are arranged on a pipeline connected with the water storage tank (1) and the reverse osmosis membrane tank (8), and a control valve (2) and a flowmeter (3) are arranged on a pipeline connected with the water storage tank (1) and the electrooxidation tank (4) or the ozone oxidation tank (10); The electric oxidation tank (4) is powered by a power supply (5), and the outlet end of the electric oxidation tank (4) is connected with the inlet end of the first buffer tank (61) through a pipeline; the ozone oxidation tank (10) is provided with ozone by the ozone generator (11), and the outlet end of the ozone oxidation tank (10) is connected with the inlet end of the second buffer tank (62) through a pipeline; A gas flowmeter (12) is arranged on a pipeline connected with the ozone generator (11) in the ozone oxidation tank (10); The outlet ends of the first buffer tank (61) and the second buffer tank (62) are connected with the inlet end of the reverse osmosis membrane tank (8) through a pipeline; The reverse osmosis membrane tank (8) is provided with two outlet ends, wherein one outlet end is connected with the inlet end of the reclaimed water recycling tank (9) through a pipeline, and the other outlet end is connected with the second inlet end of the ozone oxidation tank (10) or the oxidation tank (4) through a pipeline, and is used for refluxing the concentrated solution in the reverse osmosis membrane tank (8) to the ozone oxidation tank (10) or the electric oxidation tank (4); a control valve (2), a flowmeter (3) and a lifting pump (7) are arranged on a pipeline connected with the ozone oxidation tank (10) or the electrooxidation tank (4) of the reverse osmosis membrane tank (8); The control valve (2), the flowmeter (3), the lift pump (7) and the gas flowmeter (12) are all connected with and controlled by the automatic control mechanism (13).
2. The method according to claim 1, wherein the step a further comprises the step of mixing the sewage in the water storage tank (1) into the ozone oxidation tank (10) through the control valve (2) and the flowmeter (3) to mix with the sewage concentrate in the ozone oxidation tank (10), and the step b further comprises the step of mixing the sewage in the water storage tank (1) into the electric oxidation tank (4) through the control valve (2) and the flowmeter (3) to mix with the sewage concentrate in the electric oxidation tank (4).
3. The method of claim 1, wherein in the step a-step b, sewage in the water storage tank (1) enters the reverse osmosis membrane tank (8), the initial transmembrane pressure is regulated to be 1.2-2.0 MPa, and the cross flow speed is regulated to be 7.49-14.99 cm/s.
4. The method of claim 1, wherein the ammonia nitrogen concentration of the sewage in the step a is 5-20 mg/L, the COD concentration is 20-50 mg/L, and the chloride ion concentration is 100-300 mg/L.
5. The method according to claim 1, wherein the current density in the electrooxidation cell (4) in the step b is 10-30 mA/cm 2 , and the electrooxidation time is 30-60 min.
6. The method of claim 1, wherein the pipeline connecting the electrooxidation tank (4) and the first buffer tank (61) is provided with a control valve (2), the pipeline connecting the ozone oxidation tank (10) and the second buffer tank (62) is provided with a control valve (2), the pipeline connecting the first buffer tank (61) or the second buffer tank (62) and the reverse osmosis membrane tank (8) is provided with a control valve (2) and a lifting pump (7), and the pipeline connecting the reverse osmosis membrane tank (8) and the reclaimed water recycling tank (9) is provided with a control valve (2) and a flowmeter (3).
7. The method of claim 1, wherein the electrooxidation cell (4) comprises an electrooxidation Chi Chuankong separator (4-1), an anode (4-2) and a cathode (4-3), the anode (4-2) being connected to the positive pole of the power supply (5), the cathode (4-3) being connected to the negative pole of the power supply (5).
8. The method of claim 1, wherein the ozone oxidation basin (10) comprises a partition board (10-2) and an ozone oxidation Chi Chuankong partition board (10-3), and a catalyst placement area is arranged between the partition board (10-2) and the ozone oxidation Chi Chuankong partition board (10-3).
9. The method according to claim 1, wherein the reverse osmosis membrane tank (8) comprises a membrane module (15), a membrane tank water inlet pipe (14) connected with the water storage tank (1) or the first buffer tank (61) or the second buffer tank (62) is arranged below the membrane module (15), a concentrate return pipe (18) connected with the electrooxidation tank (4) or the ozone oxidation tank (10) is arranged above the membrane module (15), a water drain valve (16) is arranged on the concentrate return pipe (18), and a membrane tank water outlet pipe (17) connected with the reclaimed water recycling tank (9) is also arranged above the membrane module (15).

Description

Integrated device and method for advanced sewage treatment by utilizing advanced oxidation coupling reverse osmosis membrane Technical Field The invention belongs to the technical field of sewage regeneration resource utilization, and particularly relates to an integrated device and method for advanced sewage treatment by utilizing advanced oxidative coupling reverse osmosis membrane technology. Background In recent years, due to rapid development of social economy and increasing living standard of residents, human activities require more and more fresh water resources, thereby also causing a large amount of sewage to be discharged, and thus reclaimed water recycling has become one of important ways to know about insufficient water resources. In 1958, china began to put urban sewage treatment and utilization into scientific research subjects. In 1985, the first reclaimed water recycling project in the true sense of China was built in Beijing Cycloacae, and the treatment scale was 120m3/d. In 1992, the project of recycling water to industrial water in the first city of our country was built in large links. In 2002, three standards of urban sewage recycling urban miscellaneous water quality, urban sewage recycling landscape environment water quality and farmland irrigation water quality standard are discharged, and the improvement and upgrading of urban sewage treatment plants to reclaimed water recycling directions are greatly promoted. Reclaimed water is an important component of water resources and is also one of the most widely used water resources. The source of reclaimed water not only needs sewage as a potential water source, but also fully utilizes substances contained in the sewage, so that the comprehensive benefit of sewage recycling is maximized. Reverse osmosis (Reverse osmosis, RO) is a process in which solvent is selectively permeated through a membrane to achieve separation of solvent solutes by using a pressure difference across the semipermeable membrane as an impetus. The membrane pore diameter reaches the nanometer level, and the polymer material has good rejection to salts and has good removal effect on soluble organic matters, high-valence ions (such as Ca 2+、Mg2+ and the like) and low-valence ions (such as Na +、K+ and the like) in water. Has the characteristics of no phase change, low energy consumption, good quality of effluent water and the like. Because the reverse osmosis operation pressure is lower, not only can the soluble organic matters and inorganic ions in the water be removed, but also the trace elements in the water can be reserved, and the excellent purification effect can reduce the environmental risk and the health risk of the reclaimed water. However, handling of concentrates and membrane fouling are controlled to be a continuing concern. The concentrated solution contains various ions and organic matters with high concentration, and the direct discharge can cause environmental pollution. The accumulation of pollutants on the membrane can lead to lower membrane flux, and has serious influence on the water purification efficiency of the membrane, thereby causing a great amount of economic waste. Disclosure of Invention The invention aims to solve the defects in the prior art and provide an integrated device for advanced sewage treatment by utilizing advanced oxidative coupling reverse osmosis membrane technology. The invention also aims to provide a method for continuously treating sewage by using the device. The first object of the present invention can be achieved by a technical scheme that an integrated apparatus for advanced treatment of sewage using advanced oxidative coupling reverse osmosis membrane technology comprises: The device comprises a water storage tank, an electrooxidation tank, a power supply, an ozone oxidation tank, an ozone generator, a first buffer tank, a second buffer tank, a reverse osmosis membrane tank, a reclaimed water recycling tank and an automatic control mechanism; The water storage tank is provided with four outlet ends, wherein a first outlet end and a third outlet end are respectively connected with the inlet end of the reverse osmosis membrane tank through a pipeline, a second outlet end is connected with the first inlet end of the electrooxidation tank through a pipeline, and a fourth outlet end is connected with the first inlet end of the ozone oxidation tank through a pipeline; A control valve, a flowmeter and a lifting pump are arranged on a pipeline connected with the water storage tank and the reverse osmosis membrane tank, and a control valve and a flowmeter are arranged on a pipeline connected with the water storage tank and the electrooxidation tank or the ozone oxidation tank; The electric oxidation pond is powered by a power supply, and the outlet end of the electric oxidation pond is connected with the inlet end of the first buffer pond through a pipeline; The ozone oxidation tank is provided with ozone by the ozone generat