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Integrated treatment process for reverse osmosis concentrated water in reuse of reclaimed water through near-zero discharge membrane method

A reverse osmosis concentrated water, near-zero discharge technology, applied in water/sewage treatment, heating water/sewage treatment, oxidized water/sewage treatment, etc., can solve the problems of low reverse osmosis recovery rate and difficult treatment of reverse osmosis concentrated water , to save costs, reduce water evaporation, and reduce waste water discharge

Active Publication Date: 2016-05-04
NANJING UNIV OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to improve the existing technology and address the problems of low reverse osmosis recovery rate and difficult treatment of reverse osmosis concentrated water in the process of reclaimed water reuse, and propose an integrated treatment of reverse osmosis concentrated water near zero discharge membrane method for reclaimed water reuse craft

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  • Integrated treatment process for reverse osmosis concentrated water in reuse of reclaimed water through near-zero discharge membrane method

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Effect test

Embodiment 1

[0027] Recycled reverse osmosis concentrated water in papermaking enterprises, with a TDS of 1500 mg / L and a COD of 60 mg / L, is treated by the technical process of the invention. The reverse osmosis concentrated water is first adjusted to a pH of 8.5 with ammonia water, and the supergravity enhanced ozone oxidation is carried out. The supergravity factor is 20, and the ozone concentration is controlled at 5mg / L. The catalyst is ferrous sulfate, and the amount of catalyst added is 0.01% of the total mass of the reaction system. The reaction residence time was 15 minutes. After the reaction, the TDS of the reaction water is 1680mg / L, the COD is 20mg / L, and then enters the softening unit, adding Na 2 CO 3Carry out reaction softening, control hardness 5mg / L. The softened mixed liquid is settled by gravity, the supernatant enters the ultrafiltration unit, the sediment enters the solid residue treatment, and the separated solid residue waste liquid returns to the precipitation uni...

Embodiment 2

[0029] Recycled reverse osmosis concentrated water in a chemical enterprise has a TDS of 5000 mg / L and a COD of 1000 mg / L, which is treated by the technical process of the present invention. The reverse osmosis concentrated water is first adjusted to pH 13 with KOH, then supergravity enhanced ozone oxidation is carried out, the supergravity factor is 300, the ozone concentration is controlled at 160mg / L, the catalyst is manganese dioxide, and the amount of catalyst added is 1% of the total mass of the reaction system. The reaction residence time was 200 minutes. After the reaction, the TDS of the reaction water is 5000mg / L, the COD is 500mg / L, and then enters the softening unit, adding K 2 CO 3 Reactive softening was carried out to control the hardness to 300mg / L. The softened mixed liquid is settled by gravity, the supernatant enters the ultrafiltration unit, the sediment enters the solid residue treatment, and the separated solid residue waste liquid returns to the precipi...

Embodiment 3

[0031] Recycled reverse osmosis concentrated water in a dyestuff enterprise has a TDS of 2800 mg / L and a COD of 650 mg / L, which is treated by the technical process of the present invention. The reverse osmosis concentrated water is first adjusted to pH 11 with NaOH, and the reverse osmosis concentrated water is subjected to supergravity enhanced ozone oxidation. The supergravity factor is 130, and the ozone concentration is controlled at 15mg / L. The catalyst is nickel sulfate, and the amount of the catalyst added is the total mass of the reaction system. 0.05%, the reaction residence time is 300 minutes. After the reaction, the TDS of the reaction water is 3180mg / L, the COD is 342mg / L, and then enters the softening unit, adding Na 2 CO 3 Reaction softening is carried out, and the hardness is controlled to 100mg / L. The softened mixed liquid is settled by gravity, the supernatant enters the ultrafiltration unit, the sediment enters the solid residue treatment, and the separate...

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Abstract

The invention relates to an integrated treatment process for reverse osmosis concentrated water in reuse of reclaimed water through a near-zero discharge membrane method. According to the invention, the reverse osmosis concentrated water in reuse of the reclaimed water undergoes supergravity-strengthened ozonation; after supergravity-strengthened ozonation, the obtained concentrated water undergoes softening treatment and then enters an ultrafiltration system; after reverse osmosis treatment, ultrafiltered osmosis liquid successively enters electrodialysis and membrane distillation systems for further concentration treatment; waters produced from reverse osmosis, electrodialysis and membrane distillation are delivered to a water supply system for reuse; and finally, concentrated liquid undergoes evaporative crystallization, so that salt slurry and condensate water are obtained, and the condensate water is delivered to the water supply system for reuse. The integrated treatment process provided by the invnetion adopts a supergravity-strengthened ozonation technology to couple with an advanced membrane integrated technology, so recycling rate of the reverse osmosis concentrated water is improved; meanwhile, near-zero discharge of the reverse osmosis concentrated water is realized; and the advantages of advanced process, high efficiency and stable and reliable effects are obtained.

Description

technical field [0001] The invention belongs to the field of environmental protection water treatment, and relates to a treatment process for concentrated water generated in the process of reclaimed water reuse; in particular, it relates to a process for the integrated treatment of reclaimed water with reverse osmosis concentrated water near-zero discharge membrane method. Background technique [0002] With the acceleration of my country's industrialization process, more and more wastewater discharges from papermaking, chemical, dyestuff, pharmaceutical, metallurgical and other industries in the process of production, and more and more corporate water reuse projects have become the majority Basic requirements of the industry. The resulting reverse osmosis concentrated water has a huge amount of water. Due to its high salt concentration, high hardness, poor biodegradability, and high COD, it is difficult to handle with existing processes, and it has become a major problem in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10
CPCC02F9/00C02F1/04C02F2301/08C02F1/52C02F1/78C02F1/4693C02F1/441C02F1/444
Inventor 李卫星沈建良邢卫红徐南平
Owner NANJING UNIV OF TECH
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