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System and process for treating THPC-containing wastewater

A treatment system and treatment process technology, applied in the field of comprehensive treatment of flame retardant wastewater, can solve the problems of poor COD and ammonia nitrogen removal, lack of nutrient sources in the biochemical section, etc., to ensure long-term stable operation, strong protection, and removal efficiency high effect

Inactive Publication Date: 2020-09-04
湖北兴发环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a treatment system and process for THPC-containing wastewater, which effectively solves the problem of poor removal of refractory COD and ammonia nitrogen in the traditional oxidation process + biochemical treatment process of this type of wastewater, and the lack of nutrient sources in the biochemical section. And other issues

Method used

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  • System and process for treating THPC-containing wastewater
  • System and process for treating THPC-containing wastewater
  • System and process for treating THPC-containing wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Such as image 3 As shown, a THPC-containing wastewater treatment system includes a regulating tank 1, which is connected to a multi-media filtration device 2, an ultrafiltration device 3, a water softening device 4, a nanofiltration membrane system 5, and an RO membrane system through a pipeline 6 Connected in sequence, the concentrated water outlet of the RO membrane system 6 is connected to the concentrated water collection tank 7 through the pipeline, and the concentrated water collection tank 7 is connected to the evaporation device 8 and the plate heat exchanger 9 through the pipeline in sequence.

[0034] Preferably, the condensate water outlet of the plate heat exchanger 9 is connected to the forward water buffer tank of the nanofiltration membrane system 5 through a pipeline.

[0035] Preferably, the concentrated water discharge port of the nanofiltration membrane system 5 and the regenerated liquid discharge port of the water softening device 4 are connected to the...

Embodiment 2

[0041] The system of Example 1 was used for the treatment process and treatment method of THPC-containing wastewater, and the details are as follows: the THPC-containing wastewater is collected and enters the adjustment tank 1, its pH is 9.8, total phosphorus 63.85mg / L, COD 755mg / L, ammonia nitrogen 152mg / L, The SS 186mg / L is transported to the multi-media filter device 2 by a lift pump to filter, and most of the suspended solids are filtered out. The SS content is 28mg / L, and then it enters the ultrafiltration device 3 for filtration. The ultrafiltration product water SS content is 0.8mg / L, after the ultrafiltration product water enters the buffer tank, it is pumped to the water softening device 4 to remove calcium and magnesium ions, and then pumped to the nanofiltration device 5 for filtration, the operating pressure is 1.8Mpa, the total phosphorus of the nanofiltration product water is 12.7mg / L, COD183 .5mg / L, ammonia nitrogen 129.6mg / L, part of the concentrated water is re...

Embodiment 3

[0043] The system of Example 1 was used to process the THPC-containing wastewater treatment process and treatment method. The THPC-containing wastewater was collected and entered into the regulating tank 1. Its pH was 9.2, total phosphorus 85.5mg / L, COD 683mg / L, ammonia nitrogen 185mg / L, SS 144mg / L Use a lift pump to transport it to the multi-media filter device 2 to filter, filter out most of the suspended solids, the SS content is 15mg / L, and then enter the ultrafiltration device 3 to filter, the ultrafiltration product water SS content is 0.4mg / L, After the ultrafiltration product water enters the buffer tank, it is pumped to the water softening device 4 to remove calcium and magnesium ions, and then pumped to the nanofiltration device 5 for filtration. The operating pressure is 1.6Mpa, the nanofiltration recovery rate is 90%, and the total phosphorus of the nanofiltration product water is 15.2 mg / L, COD137.6mg / L, ammonia nitrogen 141.5mg / L, part of the concentrated water is...

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Abstract

The invention relates to a system and a process for treating THPC-containing wastewater. The system comprises an adjusting tank, the adjusting tank is sequentially communicated with a multi-medium filtering device, an ultrafiltration device, a water softening device, a nanofiltration membrane system and an RO membrane system through pipelines, a concentrated water discharging port of the RO membrane system is connected with a concentrated water collecting tank through a pipeline, and the concentrated water collecting tank is sequentially communicated with an evaporation device and a plate heatexchanger through pipelines. Suspended solids in THPC-containing wastewater are removed through a pre-filtration system, calcium and magnesium hardness is removed through a water softening process, total phosphorus, ammonia nitrogen and COD are removed through an organic membrane combined process, and pollutants are removed from the system by evaporating organic membrane concentrated water. The treatment system is good in stability, high in treatment efficiency and stable in effect, phosphorus-containing sludge is not additionally generated, meanwhile, free ammonia is converted into ammoniumions after sulfuric acid is added according to ammonia nitrogen pollution factors in the wastewater, so that the free ammonia is filtered out through an RO membrane, the removal efficiency of all thepollution factors is high, and the process better meets the energy conservation and emission reduction requirements of the current environmental protection policy.

Description

Technical field [0001] The invention belongs to the field of comprehensive treatment of flame retardant wastewater, and specifically relates to a treatment system and process for wastewater containing THPC. Background technique [0002] THPC, or tetrahydroxymethyl phosphorous chloride, is a commonly used organic flame retardant. It is mainly used for flame retardant treatment of fabrics. It is also used as an additive flame retardant for plastics and paper products. It can also be used in organic synthesis. Due to the wide application of such organic phosphorus flame retardants, the wastewater after flame retardant treatment contains pollution factors such as total phosphorus, COD, ammonia nitrogen, and SS. This type of wastewater treatment has increasingly become a common problem in the flame retardant industry. At present, there are many treatment methods of inorganic phosphorus, including iron salt, aluminum salt, calcium salt, etc., and the removal effect is good, but this ki...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F101/10C02F101/16
CPCC02F9/00C02F1/441C02F1/442C02F1/444C02F1/001C02F1/42C02F2001/425C02F1/04C02F2101/16C02F2101/105
Inventor 袁木平屠宏飞李永刚杨超龙刘超宇郑巍刘舜蔡代周张波
Owner 湖北兴发环保科技有限公司
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