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Resource pretreatment technology for desulfurization waste water hardness ions

A technology for desulfurization wastewater and hardness ions, which is applied in gaseous discharge wastewater treatment, multi-stage water treatment, water/sewage multi-stage treatment, etc. And other issues

Active Publication Date: 2016-10-12
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the structure of the patented treatment process is relatively simple, its treatment effect on desulfurization wastewater is not very good, and related wastewater will still be generated, which cannot truly meet the requirements of zero discharge.

Method used

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  • Resource pretreatment technology for desulfurization waste water hardness ions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] like figure 1 The specific steps of the desulfurization wastewater resources integrated pretreatment process shown are as follows:

[0039] The desulfurization wastewater discharged from the boiler flue gas wet desulfurization unit is collected in the desulfurization wastewater tank 6, and then enters the pre-coagulation tank 7, where neutralizer A (lime) and coagulant aid (polydimethyldiallyl chloride Ammonium) is added into the pre-coagulation tank 7 from the coagulation dosing tank 8, and the pH value in the wastewater is controlled to be about 7. After mixing evenly, it enters the pre-sedimentation tank 9 to realize solid-liquid separation. After solid-liquid separation, the particles at the bottom of the pre-sedimentation tank 9 are returned to the cyclone 4 in the flue gas desulfurization unit by the first return pump 10 , and the supernatant flows into the first softening tank 11 .

[0040] Sodium hydroxide and lime are added in a ratio of 1:10, and the compound...

Embodiment 2

[0046] A desulfurization wastewater hardness ion resource pretreatment process, specifically comprising the following steps:

[0047] The desulfurization wastewater discharged from the boiler flue gas wet desulfurization unit is collected in the desulfurization wastewater tank 6, and then enters the pre-coagulation tank 7, where neutralizer A (lime) and coagulant aid (polydimethyldiallyl chloride Ammonium) is added into the pre-coagulation tank 7 from the coagulation dosing tank 8, and the pH value in the wastewater is controlled to be about 9. After mixing evenly, it enters the pre-sedimentation tank 9 to realize solid-liquid separation. After solid-liquid separation, the particles at the bottom of the pre-sedimentation tank 9 are returned to the cyclone 4 in the flue gas desulfurization unit by the first return pump 10 , and the supernatant flows into the first softening tank 11 .

[0048] Sodium hydroxide and lime are added in a ratio of 1:2, and the compound softener compo...

Embodiment 3

[0054] The desulfurization wastewater discharged from the boiler flue gas wet desulfurization unit is collected in the desulfurization wastewater tank 6, and then enters the pre-coagulation tank 7, where neutralizer A (lime) and coagulant aid (polydimethyldiallyl chloride Ammonium) is added into the pre-coagulation tank 7 from the coagulation dosing tank 8, and the pH value in the wastewater is controlled to be about 8. After mixing evenly, it enters the pre-sedimentation tank 9 to realize solid-liquid separation. After solid-liquid separation, the particles at the bottom of the pre-sedimentation tank 9 are returned to the cyclone 4 in the flue gas desulfurization unit by the first return pump 10 , and the supernatant flows into the first softening tank 11 .

[0055] Sodium hydroxide and lime are added in a ratio of 1:5, and the compound softener composed of coagulant aid (polydimethyldiallyl ammonium chloride) is mixed uniformly in the first dosing box 12 After that, it is ad...

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Abstract

The invention relates to a resource pretreatment technology for desulfurization waste water hardness ions. The resource pretreatment technology includes the following steps that desulfurization waste water from a flue gas desulfurization unit is conveyed into a pre-coagulating precipitate unit, suspended matter, SO4<2-> and F<-> in the desulfurization waste water are removed after coagulation, and then the waste water sequentially passes through a first softening precipitate group to remove Mg<2+> and generate magnesium hydrate, passes through a second softening precipitate group to remove Ca<2+> and generate ettringite and passes through a third softening precipitate group to remove Ca<2+> and generate calcium carbonate which is recovered as a desulfurizing agent. Compared with the prior art, various hardness ions can be effectively removed, precipitates such as magnesium hydrate, ettringite and calcium carbonate are recovered and used, the resource degree of pollution ions is high, and waste water and sludge are hardly discharged.

Description

technical field [0001] The invention relates to the technical field of environmental protection and rational utilization of water resources, in particular to a pretreatment process for desulfurization wastewater hardness ion resource utilization. Background technique [0002] Sulfur dioxide (SO 2 ) is one of the important causes of acid rain formation. Control thermal power plant SO 2 Emissions are controlled SO 2 The key to pollution. In the process of wet flue gas desulfurization, in order to maintain the balance of substances in the slurry circulation system of the desulfurization device, prevent the chloride ions in the flue gas from exceeding the specified value, and ensure the quality of the by-product gypsum or magnesium sulfate, a certain amount of desulfurization wastewater must be discharged from the system. Desulfurization wastewater from thermal power plants has low pH, high content of suspended solids and small particles, Ca 2+ , Mg 2+ with SO 4 2- It ha...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/14C02F103/18
CPCC02F1/56C02F9/00C02F2001/007C02F2101/101C02F2101/14C02F2103/18C02F2301/08
Inventor 周振窦微笑张伟任之豪李雪洁陈晓慈蒋路漫
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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