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Treatment method for high-salt and high-COD (chemical oxygen demand) wastewater

A treatment method and wastewater technology, applied in multi-stage water treatment, water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems of high energy consumption and high production cost, reduce energy consumption, reduce environmental protection pressure, The effect of saving consumption

Inactive Publication Date: 2019-02-12
泰兴锦汇化工有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this invention uses carbonization to treat wastewater and can achieve certain effects, there are still problems of high energy consumption and high production costs in the early stage of distillation and concentration and in the subsequent stage of waste heat utilization.

Method used

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  • Treatment method for high-salt and high-COD (chemical oxygen demand) wastewater
  • Treatment method for high-salt and high-COD (chemical oxygen demand) wastewater
  • Treatment method for high-salt and high-COD (chemical oxygen demand) wastewater

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Embodiment 1

[0044] This embodiment is a treatment method for high-salt and high-COD wastewater, wherein the high-salt and high-COD wastewater is the wastewater produced in the regeneration production of dye intermediates and dilute acids, including disperse dye wastewater, H acid wastewater, sodium chloride solution, sulfuric acid Sodium solution or para-ester wastewater, the present embodiment selects para-ester wastewater, including the following steps:

[0045] (1) Concentrate high-salt and high-COD wastewater by MVR distillation and spray drying to form powder:

[0046] as attached figure 1 As shown, the waste water in this embodiment is pressurized by the feed pump 1 and firstly enters the first plate-type preheater 2, conducts heat exchange with the condensed water generated by the system and heats it to 95-98°C, and then enters the second tube-type preheater The device exchanges heat with the non-condensable gas.

[0047]The material preheated twice enters the crystallizer 6 for ...

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Abstract

The invention relates to a treatment method for high-salt and high-COD (chemical oxygen demand) wastewater. According to the method, the high-salt and high-COD wastewater undergoes MVR (Mechanical Vapor Recompression) distillation and concentration and spray baking, so that powder is formed, and the powder is sent into an oxygen-free splitting carbonization furnace filled up with superheated vaporand heated to 500 DEG C to 650 DEG C by the superheated vapor to undergo splitting and carbonization. The treatment method for the high-salt and high-COD wastewater is optimized, the difficulty of wastewater treatment is decreased, moreover, energy consumption is reduced, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a treatment method for high-salt and high-COD wastewater, in particular to a treatment method for high-salt and high-COD wastewater produced in the regeneration production of dye intermediates and dilute acids. Background technique [0002] At present, there are many conventional treatment methods for production wastewater, including wet oxidation, photocatalysis, oxidation, and electrodialysis. However, these methods have the problems of complex equipment, special materials, difficult quality assurance, expensive medicaments, harsh operating conditions, high energy consumption and secondary pollution. [0003] Patent Document 1 specifically discloses a method and device for carbonizing printing and dyeing intermediate production wastewater with superheated steam. In this method, the production wastewater of printing and dyeing intermediates is concentrat...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F1/04C10B53/00F23G7/06B01D50/00B01D53/50B01D53/56B01D53/60B01D53/62B01D53/68B01D53/70B01D53/78B01D53/83B01D53/75
CPCB01D53/502B01D53/504B01D53/56B01D53/60B01D53/62B01D53/68B01D53/70B01D53/75B01D53/78B01D53/83F23G7/06C10B53/00C02F1/041C02F9/00C02F2301/046C02F2301/08C02F1/66C02F1/52C02F1/001C02F1/38C02F2001/5218B01D50/20
Inventor 赵卫国吴玉生
Owner 泰兴锦汇化工有限公司
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