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Pretreatment method for remaining RO concentrated water obtained after double-membrane desalination recycling of PTA sewage

A technology of pretreatment and concentrated water, applied in water/sewage treatment, biological water/sewage treatment, neutralized water/sewage treatment, etc. High concentration and activity, good hydraulic conditions, and the effect of improving biodegradability

Inactive Publication Date: 2016-12-07
EAST CHINA ENG SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] The purpose of the present invention is to solve the problem of poor biodegradability of RO concentrated water produced in the reuse process of PTA production wastewater and difficulty in direct biochemical treatment

Method used

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  • Pretreatment method for remaining RO concentrated water obtained after double-membrane desalination recycling of PTA sewage
  • Pretreatment method for remaining RO concentrated water obtained after double-membrane desalination recycling of PTA sewage

Examples

Experimental program
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Effect test

Embodiment 1

[0058] A kind of PTARO concentrated water treatment technology is completed according to the following steps:

[0059] (1) Fenton oxidation treatment unit: The homogeneously adjusted wastewater is lifted into the Fenton fluidized bed, and sulfuric acid is added to the water outlet of the lift pump to adjust the pH of the wastewater to 3-4. The Fenton fluidized bed is equipped with 4 internal circulation pumps (2 for use and 2 for standby). Add ferrous sulfate heptahydrate solution to the outlet pipes of two of the circulating pumps, and add hydrogen peroxide to the pressure water pipes of the other two circulating pumps (ferrous sulfate heptahydrate: 27.5% hydrogen peroxide mass ratio 1:1) . The design influent COD of PTA RO concentrated water is about 200mg / L, the designed effluent COD is reduced to 150mg / L, the dosage of 27.5% hydrogen peroxide is 0.35kg / ton of wastewater, and the dosage of ferrous sulfate heptahydrate is 0.35 kg / ton of waste water. When the Fenton fluidi...

Embodiment 2

[0067] The difference between this embodiment and the first embodiment is that the COD concentration of the RO concentrated water in step (1) is 300 mg / L. Others are the same as the specific method one.

Embodiment 3

[0069] The difference between this embodiment and specific embodiment one or two is that the Fenten fluidized bed described in step (1) can be replaced by a Fenton oxidation reaction pool, the reaction time of the Fenton oxidation reaction pool is not less than 1.5h, and various medicaments are injected The amount needs to be increased. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a pretreatment method for remaining RO concentrated water obtained after double-membrane desalination recycling of PTA sewage. The method is used for solving the problem that downstream garden type terminal sewage plant standard treatment cannot reach the standard for discharge due to the fact that remaining RO concentrated water obtained after existing PTA sewage recycling is difficultly subjected to direct biochemical and deep treatment. The method is technically characterized in that two pretreatment technologies of Fenton oxidation and hydrolysis acidification are organically combined, optimal design is performed through two technological types, the operation cost of Fenton oxidation is lowered, and the hydrolytic acidification treatment efficiency is also improved. Advanced oxidation and biological pretreatment are organically combined better. The technology is mainly applied to the field of petrifaction and similar industrial wastewater treatment.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment in the environmental protection industry, and in particular relates to a pretreatment method for residual RO concentrated water after double-membrane desalination and reuse of PTA sewage. Background technique [0002] Purified terephthalic acid (PTA) is one of the important bulk organic raw materials. It is widely used in various aspects of the national economy such as chemical fibers, light industry, electronics, and construction. Its downstream extension products are mainly polyester fibers, commonly known as polyester, It is the main raw material for the textile industry. The PTA industry has entered the peak period of capacity expansion since 2011. By 2014, the domestic PTA production capacity was about 43.35 million tons. In the past two years, due to excessive market pressure and sluggish downstream demand, the production capacity has decreased. [0003] A large amount of PTA prod...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F103/36
CPCC02F1/52C02F1/66C02F1/722C02F3/00C02F9/00C02F2001/007C02F2103/36C02F2305/026
Inventor 叶建忠梅红司旭东
Owner EAST CHINA ENG SCI & TECH
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