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Advanced treatment method for waste water

It is a technology for advanced treatment and waste water, which is applied in textile industry waste water treatment, multi-stage water treatment, water/sewage treatment, etc. It can solve the problems of low utilization rate, ultrafiltration or microfiltration backwash discharge water cannot meet the discharge standard, etc. Achieve the effects of reducing treatment costs, improving water resource utilization, and improving system recovery rates

Inactive Publication Date: 2017-09-29
TORAY ADVANCED MATERIALS RES LAB CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problems that the nanofiltration or reverse osmosis concentrated water and ultrafiltration or microfiltration backwash discharge water produced after wastewater reuse treatment cannot meet the discharge standard and the utilization rate is low, it provides a method based on the existing treatment technology. Backflow reprocessing, thereby improving the recovery rate of the sewage reuse system, reducing treatment costs, and an advanced treatment technology that maximizes the utilization of water resources according to reuse requirements

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The amount of water treated in this test is 500m 3 / d, a certain wastewater is treated with aerobic biological treatment and coagulation and sedimentation to obtain primary treatment water, the COD of the primary treatment water is 50mg / L, and the content of macromolecules with a molecular weight greater than 100kDa (ie 100,000 Daltons) is 12% , the B / C value is 0.2, the TDS is 250mg / L, the hardness is 60mg / L, and the sulfate radical is 45mg / L. The primary treatment water is treated with ozone, activated carbon and ultrafiltration to obtain ultrafiltration product water, which is recovered by ultrafiltration The rate is 90%. The ultrafiltration product water is treated by reverse osmosis to obtain reverse osmosis product water. The recovery rate of reverse osmosis is 80%, the desalination rate is 98%, and the COD of reverse osmosis concentrated water is 100mg / L, which cannot be discharged directly. 95% of reverse osmosis concentrated water and 100% of ultrafiltration ba...

Embodiment 2

[0034] The amount of water treated in this test is 500m 3 / d, a certain printing and dyeing wastewater is treated with biochemical treatment and precipitation treatment to obtain primary treatment water. The COD of the primary treatment water is 135mg / L, the content of macromolecules with a molecular weight greater than 100kDa is 5%, the B / C value is 0.10, and the TDS is 400mg / L L, the hardness is 100mg / L, and the sulfate radical is 70mg / L. The primary treatment water is treated with ozone, activated carbon and ultrafiltration to obtain ultrafiltration water. The ultrafiltration recovery rate is 90%. The ultrafiltration water is reverse osmosis After treatment, the reverse osmosis product water is obtained, the reverse osmosis recovery rate is 60%, the desalination rate is 99%, and the COD of the reverse osmosis concentrated water is 180mg / L, which cannot be directly or indirectly discharged. 100% reverse osmosis concentrated water and 90% ultrafiltration backwash discharge wa...

Embodiment 3

[0036] The amount of water treated in this test is 500m 3 / d, a certain printing and dyeing wastewater is treated with biochemical treatment and precipitation treatment to obtain primary treatment water. The COD of the primary treatment water is 135mg / L, the content of macromolecules with a molecular weight greater than 100kDa is 18%, the B / C value is 0.15, and the TDS is 400mg / L L, the hardness is 100mg / L, and the sulfate radical is 70mg / L. The primary treatment water is treated with ozone, activated carbon and ultrafiltration to obtain ultrafiltration water. The ultrafiltration recovery rate is 90%. The ultrafiltration water is reverse osmosis After treatment, the reverse osmosis product water is obtained, the reverse osmosis recovery rate is 60%, the desalination rate is 99%, and the COD of the reverse osmosis concentrated water is 130mg / L, which cannot be discharged directly. 65% of the reverse osmosis concentrated water and 90% of the ultrafiltration backwash discharge wa...

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Abstract

The invention belongs to the field of advanced treatment of waste water. Primary treatment of the waste water is allowed to carry out, so that primary treatment water is obtained, the primary treatment water passes through a pretreatment unit and a membrane treatment unit, so that produced water is obtained, partial nanofiltration and / or reverse osmosis concentrated water and partial microfiltration and / or ultrafiltration backwash discharge water return to the pretreatment unit and pass through the pretreatment unit, and microfiltration and / or ultrafiltration are allowed to carry out, so that secondary treatment water is obtained. Partial secondary treatment water merges with the produced water to obtain reuse water, and the utilization rate of water is improved under the conditions that the recovery rates of the nanofiltration and reverse osmosis are not improved. The secondary treatment water without merging with the produced water merges with the unreturned water to obtain secondary merging water, which can be used in the fields of landscape water and Industrial cooling water. The method fully utilizes the current technologies, and the recovery rate of the system is improved without influencing the service life of a membrane, and the processing cost of every ton of water is reduced, and meanwhile, the nanofiltration or reverse osmosis concentrated water and microfiltration or ultrafiltration backwash discharge water are treated and then reused, sewage charges are reduced, and the utilization rate of the water is improved.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to a technology for advanced wastewater treatment using a membrane method. Background technique [0002] Refractory organic wastewater such as printing and dyeing wastewater is a large discharge of industrial wastewater, and it is difficult to treat. The basic raw materials for dye production include benzene series, naphthalene series, anthraquinone, aniline and benzidine compounds, etc., and are often chelated with metals, salts and other substances during the production process, resulting in difficult wastewater treatment. At present, the treatment methods of refractory organic wastewater such as printing and dyeing wastewater mainly include biological treatment, oxidation (chemical oxidation, photocatalysis, microwave synergy), adsorption, coagulation, and electrochemical methods. In addition, as a new type of separation technology, membrane technology is more and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/30
CPCC02F1/281C02F1/441C02F1/442C02F1/444C02F1/52C02F1/78C02F9/00C02F2103/30C02F2301/08
Inventor 宁文娟黄圣散杨瑜芳
Owner TORAY ADVANCED MATERIALS RES LAB CHINA
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