Alkaline tower wastewater treatment system and treatment method

A wastewater treatment system and wastewater treatment technology, applied in the direction of gaseous effluent wastewater treatment, water/sewage treatment, water/sewage multi-stage treatment, etc., can solve problems such as high discharge pressure, achieve increased salt content, wide applicability, good economical effect

Pending Publication Date: 2020-09-11
SHAANXI BEIYUAN CHEM GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the TDS content in the advanced treatment wastewater is above 20g / L, and the CODcr content is also above 1000mg / L, so the discharge pressure is still very high

Method used

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  • Alkaline tower wastewater treatment system and treatment method

Examples

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Effect test

Embodiment 1

[0035] A calcium carbide polyvinyl chloride enterprise uses a low-mercury catalyst to synthesize vinyl chloride monomer. The salt content of the alkali washing tower wastewater is about 20%, and the wastewater contains a large amount of organic matter and mercury. The CODcr content is above 2000mg / L, and the mercury in the wastewater The content is 0.1-1ppm. The alkali washing tower wastewater treatment system realizes the separation of salt, organic matter and mercury in the wastewater. The main components of the crystalline salt are sodium carbonate and sodium chloride after being calcined, which can be used to remove calcium ions in the primary brine process. After being treated by the biochemical system, the waste water can be reused to configure lye or other processes.

Embodiment 2

[0037] The waste water from the alkali washing tower of a coal-to-ethylene enterprise adopts this waste water treatment system after degreasing. The salt content of the waste water is about 15%, and the CODcr content of the waste water is above 10,000 mg / L. After low-temperature evaporation and crystallization, the separation of salt and organic matter is realized. , sell the crystalline salt to chlor-alkali enterprises, and the waste water will be reused after being treated by the biochemical system.

Embodiment example 3

[0039] An enterprise's high-salt organic wastewater adopts this wastewater treatment system, which realizes the separation of salt and organic matter in wastewater, and the cost of wastewater treatment is lower than that of MVR.

[0040] After heat exchange, the waste water from the alkali washing tower enters the low-temperature evaporation and crystallization equipment for countercurrent contact and mass transfer with the flue gas discharged from the thermal power plant. The waste water is continuously circulated to achieve evaporation and crystallization. Sodium is converted into sodium carbonate, and the mixed salt is reused in the primary brine treatment system. The evaporated water vapor contacts the cooling water for mass transfer and heat exchange, and the waste water is reused after being treated by the biochemical system.

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Abstract

The invention discloses an alkaline tower wastewater treatment system, which comprises a heat exchange system; the heat exchange system is connected with a low-temperature evaporative crystallizationsystem, the low-temperature evaporative crystallization system is respectively connected with a cooling system and a calcining system, the cooling system is connected with a biochemical system, and the calcining system is connected with a primary brine treatment system. The invention also discloses a wastewater treatment method, which comprises the following steps: firstly, performing heat exchange between wastewater and a low-temperature heat source, and then performing heat exchange and evaporative crystallization with flue gas in a low-temperature evaporative crystallization system; performing heat exchange on the water vapor obtained after waste gas mass transfer and heat transfer with cooling water, and then feeding the treated water into a biochemical system to be used as productionwater; calcining the crystalline salt to remove impurities in the salt to obtain mixed salt, and dissolving and filtering the mixed salt to remove calcium ions in a primary brine system. The wastewater chemically reacts with CO2, SO2 and the like in the flue gas, so that the salt content of the wastewater is increased, and the evaporation capacity of the wastewater is further increased through reaction heat release; according to the system, the high-salt organic wastewater can be separated into crystalline salt and organic wastewater, and further treatment and recycling are facilitated.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and in particular relates to an alkali washing tower waste water treatment system and a treatment method thereof. Background technique [0002] In the calcium carbide polyvinyl chloride industry, the chlorine ion content of the VCM alkali washing tower wastewater is about 50g / L, and the Na 2 CO 3 The content of mercury is below 5%, the content of NaOH is 10-15%, the content of CODcr is above 2000mg / L, and the content of mercury in waste water is 0.1-1ppm. At present, the wastewater treatment process mainly includes acid neutralization, sodium sulfide precipitation to remove mercury, and advanced treatment of mercury adsorption resin. After the wastewater is treated by this process, the mercury content is below 3ppb, and the mercury content meets the discharge standard. However, the TDS content in the advanced treated wastewater is above 20g / L, and the CODcr content is also above 1...

Claims

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Application Information

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IPC IPC(8): C02F9/14C01D7/12C02F101/20C02F101/30C02F103/18
CPCC02F1/048C02F1/10C02F1/16C02F3/34C01D7/123C02F2103/18C02F2101/30C02F2101/20
Inventor 徐向平熊磊王江涛高世军慕毅韩慧珏刘勇
Owner SHAANXI BEIYUAN CHEM GROUP
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