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Method and device for realizing zero discharge of desulfurization wastewater

A technology for desulfurization wastewater and zero discharge, applied in chemical instruments and methods, gaseous effluent wastewater treatment, dehydration/drying/thickened sludge treatment, etc., can solve the problems of large floor area, high heat loss, high investment cost, etc. Achieve the effects of small footprint, less equipment, and short process routes

Inactive Publication Date: 2016-03-30
GO HIGHER ENVIRONMENT GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention proposes a method and device for zero discharge of desulfurization wastewater, which overcomes the problems of high investment cost, high energy consumption, high heat loss, complicated operation and large floor area of ​​the prior art

Method used

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  • Method and device for realizing zero discharge of desulfurization wastewater
  • Method and device for realizing zero discharge of desulfurization wastewater

Examples

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Embodiment 1

[0073] Example 1 is a zero-discharge and resource-based treatment process for wet flue gas desulfurization wastewater from a power plant in Hebei, raw water Cl - , Ca 2 + , Mg 2+ , SO 4 2- , NO 3 - , SiO 2 , fluoride and suspended matter concentrations were 12000, 1618.5, 5380, 8000, 300, 250, 125 and 4000mg / L and contained a small amount of heavy metal ions. Ca in desulfurization wastewater after chemical softening and two-stage flocculation-sedimentation treatment 2+ , Mg 2+ , SiO 2 , fluoride, SO 4 2- The removal rates of suspended solids and suspended solids reached 98.6%, 96.9%, 93.5%, 88%, 90% and 99.5% respectively, meeting the water inlet requirements of the MVR evaporator. The effluent from the secondary flocculation and sedimentation unit enters the MVR evaporator for evaporation and crystallization, and the distilled water produced by the evaporator is Cl - and NO 3 - Fresh water with a concentration of less than 200 and 100mg / L is reused in the daily...

Embodiment 2

[0074] Example 2 is a zero-discharge and resource-based treatment process for wet flue gas desulfurization wastewater from a power plant in Hubei, raw water Cl - , Ca 2 + , Mg 2+ , SO 4 2- , NO 3 - , SiO 2 , fluoride and suspended matter concentrations are 16000, 1000, 4000, 4000, 250, 180, 100 and 3500 mg / L respectively and contain a small amount of heavy metal ions. Ca in desulfurization wastewater after chemical softening and two-stage flocculation-sedimentation treatment 2+ , Mg 2+ , SiO 2 , fluoride, SO 4 2- And the removal rate of suspended solids reaches 99%, 98%, 95%, 90%, 91% and 100% respectively, meeting the water inlet requirements of the MVR evaporator. The effluent from the secondary flocculation and sedimentation unit enters the MVR evaporator for evaporation and crystallization, and the distilled water produced by the evaporator is Cl - and NO 3 - Fresh water with a concentration of less than 300 and 100mg / L is reused in the daily production proc...

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Abstract

The invention provides a method and a device for realizing zero discharge of desulfurization wastewater and solves problems of the high energy consumption, the high dosage of chemical agents and the high cost in the prior art. The device for realizing zero discharge of the desulfurization wastewater comprises a pre-sedimentation unit, an adjusting unit, a primary flocculation and sedimentation unit, a softening unit, a secondary flocculation and sedimentation unit, an intermediate water tank unit, an evaporation and crystallization unit, two stages of sludge treatment units and a water producing tank, wherein the softening unit and two stages of flocculation and sedimentation units are arranged in front of the evaporation and crystallization unit so as to remove metal ions, F<-> and hardness of the desulfurization wastewater, water inlet requirements of the subsequent evaporation and crystallization unit are met, and the scaling tendency of the evaporation and crystallization unit is relieved. Meanwhile, the content of salt of the desulfurization wastewater is high, the evaporation and crystallization unit enables the salt of the desulfurization wastewater to form valuable industrial salt, and the desulfurization wastewater is recycled. The method and the device have the benefits as follows: the running cost is low, the energy consumption is low, the quality of produced water is good, the design is reasonable, scaling of the evaporation and crystallization unit is effectively prevented, and meanwhile, the desulfurization wastewater can be recycled.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, in particular to a method and device for zero discharge of desulfurization wastewater. Background technique [0002] The newly promulgated "Water Pollution Prevention and Control Action Plan" puts forward more stringent requirements on the prevention and control of industrial wastewater pollution, the improvement of water use efficiency, the control of the total amount of pollutant discharge, and the control of environmental risks, which makes coal, electric power, steel, chemical industry Key industries such as the need to vigorously promote industrial wastewater recycling technology in order to achieve the goal of "zero discharge". [0003] "Zero discharge" refers to activities that reduce pollutants and energy emissions to zero indefinitely, that is, the industrial wastewater generated by various enterprises in the production process can be reused after appropriate technical treatment, and ...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F11/12C02F11/14C02F103/18C02F101/20C02F101/22
CPCC02F9/00C02F11/122C02F11/14C02F1/048C02F2101/20C02F2101/22C02F2103/18C02F2001/007C02F1/5236C02F1/56C02F1/66C02F5/08C02F2301/08
Inventor 陈福泰李廷英张桂英
Owner GO HIGHER ENVIRONMENT GRP CO LTD
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