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Filtrate recovery system and method

A waste liquid recovery and filtrate technology, which is applied in the direction of chemical instruments and methods, filtration treatment, water treatment parameter control, etc., can solve the problems that cannot be directly discharged, cannot be directly recycled, and the treatment cost is high, so as to reduce the cost of sewage treatment, The effect of reducing the amount of sewage treatment and increasing the product yield

Inactive Publication Date: 2020-05-19
浙江海钛新材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this process, after the product expansion microspheres are separated, 0.5-2% of the product particles and other microsphere mother liquor of a large number of macromolecular substances remain in the filtrate. Due to the complexity of the system components, it cannot be directly recycled. The ammonia nitrogen in the system and COD indicators are high, and cannot be discharged directly, and because the system contains a large amount of inorganic salt dispersant, the treatment cost is high

Method used

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  • Filtrate recovery system and method

Examples

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Effect test

Embodiment 1

[0019] like figure 1 As shown, a waste liquid recovery system is based on a separator 4 for pre-separation of the production mother liquor. The system includes the following components sequentially arranged downstream of the separator: at least 2 primary filtrate switching tanks 1 arranged in parallel, primary cooling 2, ceramic membrane device 3, at least 2 secondary filtrate switching tanks 5, secondary cooler 6, nanofiltration membrane device 7 and recovery water tank 8, at least 2 sets in parallel, the waste liquid outlet of separator 4 is switched with primary filtrate Tank 1 is connected through a pipeline with a control valve 13, the liquid outlet of the primary filtrate switching tank 1 is connected to the primary cooler 2 through a pipeline with a control valve 13 and a primary delivery pump 9, and the outlet of the primary cooler 2 passes through The pipeline with the primary circulation pump 10 is connected to the ceramic membrane device 3, and the clear liquid outl...

Embodiment 2

[0033] A standard formula condition is used to produce microsphere expansion agent, the filtrate separated by 2000 mesh filter cloth is used (centrifugation is more difficult), and the COD in the separated mother liquor is 14890mg / L;

[0034] Take 20L of the filtrate and store it in a steel tank. The steel tank is cooled by a jacket and pumped to a ceramic membrane device for separation. The initial pump outlet pressure is 0.26MPa, the ceramic outlet pressure is 0.18MPa, and the membrane flux is 16.5L / h. When the pump outlet pressure is 0.28MPa, the ceramic outlet pressure is 0.19MPa, and the membrane flux is 13.8L / h, the dense phase is 1.4L, and the clear liquid is 17.3L;

[0035] Dry 1.4L of dense phase, and the weight of the solid is 0.12kg;

[0036] The 17.3L clear liquid obtained by separating the ceramic membrane is stored in the steel tank, the steel tank is cooled by a jacket, and is separated by pumping to the nanofiltration membrane device. The initial pump outlet pr...

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Abstract

The invention relates to a filtrate recovery system and a method. The filtrate recovery system comprises the following components which are sequentially arranged at the downstream of a separator: at least two first-stage filtrate switching tanks arranged in parallel, afirst-stage cooler, a ceramic membrane device, at least two second-stage filtrate switching tanks arranged in parallel, a second-stage cooler, a nanofiltration membrane deviceand arecycled water tank; a waste liquid outlet of the separator is connected with thefirst-stage filtrate switching tanks through a pipeline with a controlvalve;liquid outlets of the first-stage filtrate switching tanks are connected with the first-stage cooler; an outlet of the first-stage cooler is connected with the ceramic membrane device, a clearliquid outlet of the ceramic membrane device is connected with the second-stage filtrate switching tanks,liquid outlets of the second-stage filtrate switching tanks are connected with the second-stagecooler, an outlet of the second-stage cooler is connected with the nanofiltration membrane device, and a clear liquid outlet of the nanofiltration membrane device is communicated with the recycled water tank. By utilizing the switching tanks, the concentration of the filtrate is controlled to change from low to high in one cycle, themembraneflux is integrally improved, and the recovery of productparticles in the filtrate and the recovery and reuse of the filtrate are realized.

Description

technical field [0001] The invention relates to a filtrate recovery system and method, and belongs to the technical field of waste liquid recovery. Background technique [0002] In the process of chemical production, reaction products (solid phase substances) and water phase substances or other dispersion media generally need to be separated by filtration, but the separated filtrate contains a large number of macromolecular substances and some impurities such as product particles that are difficult to separate. The filtrate cannot be directly recovered and recycled, and as sewage treatment, it will cause a lot of waste of water resources, inorganic salts, particulate products, etc., and cause environmental pollution, which does not conform to the concept of circular economy. [0003] Through the study of the filtrate produced by the microsphere expansion agent in which the reaction product is dispersed in the water phase substance or other dispersion medium in chemical produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/02C02F101/30
CPCC02F1/001C02F1/442C02F2101/30C02F2209/08
Inventor 宁鹏董梅魏增吴超
Owner 浙江海钛新材料科技股份有限公司
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