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Apparatus and method for pretreatment of desulfurization wastewater

A desulfurization wastewater and pretreatment technology, which is applied in the direction of gaseous effluent wastewater treatment, water/sludge/sewage treatment, water softening, etc., can solve the problems of increasing the cost of sedimentation sludge treatment and high pretreatment cost, and avoid sulfuric acid Calcium scaling problem, the effect of less dosage of chemicals and less sludge production

Pending Publication Date: 2017-10-24
DATANG ENVIRONMENT IND GRP
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Problems solved by technology

However, when RO and other membrane treatment processes are used, strict pretreatment of wastewater is required. Due to the high concentration of calcium and magnesium in wastewater and the supersaturated state of calcium sulfate, the cost

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  • Apparatus and method for pretreatment of desulfurization wastewater
  • Apparatus and method for pretreatment of desulfurization wastewater

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with the accompanying drawings, specific implementation methods and examples.

[0033] Such as figure 1 As shown, in one embodiment, the device for desulfurization wastewater treatment provided is arranged as follows according to the flow direction of desulfurization wastewater: including a primary reactor 1, a primary sedimentation tank 2, a secondary reactor 4, a secondary sedimentation tank 5, a primary sedimentation tank A sludge discharge port 3 and a sludge discharge port 6 are respectively provided at the bottom of the pool 2 and the secondary sedimentation tank 6 . By setting up the primary settling tank and the secondary settling tank, the heavy metal sludge can be separated and treated separately, which is beneficial to reduce the cost of sludge treatment.

[0034] In an embodiment not shown in the figure, the desulfurization wastewater can be properly pretreated before entering the reactor ...

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Abstract

The invention provides an apparatus for pretreatment of desulfurization wastewater. The apparatus is provided with, in flowing direction of the desulfurization wastewater, a first-stage reactor, which is provided with a barium hydroxide adding unit and an organic sulfur or sulfide adding unit; and a second-stage reactor, which is provided with a barium salt adding unit. Through optimization on a softening pretreatment process before evaporative crystallization of the desulfurization wastewater, the cost of treating the desulfurization wastewater through the evaporative crystallization is effectively reduced. The invention also provides another apparatus, in which the positions of the organic sulfur or sulfide adding unit and the barium salt adding unit are exchanged. The invention also provides methods, based on the two apparatuses, for achieving the pretreatment of desulfurization wastewater.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a device and method for pretreatment of desulfurization wastewater. Background technique [0002] Coal-fired power generation occupies an important position in my country's energy supply. In order to protect the atmospheric environment, in recent years, most power plants in my country have adopted limestone-gypsum wet desulfurization technology to remove sulfur dioxide in flue gas. The composition of wet desulfurization wastewater from coal-fired power plants is complex, containing high concentrations of suspended solids, supersaturated sulfites, chloride ions, sulfates and various heavy metals. At present, desulfurization wastewater is mainly treated by chemical precipitation method, and some indicators are difficult to reach the standard. Even after the standard treatment, due to the existence of a large amount of sulfate and chloride in the wastew...

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Application Information

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IPC IPC(8): C02F5/02C02F103/18C02F101/20C02F101/10
CPCC02F5/02C02F2103/18C02F2101/20C02F2101/101
Inventor 刘海洋杨春平陈海杰谷小兵江澄宇李叶红
Owner DATANG ENVIRONMENT IND GRP
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