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Novel desulfurization waste water treatment method

A wastewater treatment and new desulfurization technology, which is applied in the direction of gaseous effluent wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. It can solve the problems of heavy metals difficult to meet standards, large amount of sludge, and high cost. , to reduce treatment costs, improve effluent water quality, and avoid system blockage

Inactive Publication Date: 2015-07-29
JIANGSU YUANNENG ENVIRONMENT ENG
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Problems solved by technology

At present, the conventional wet desulfurization wastewater treatment of power plants adopts a single-stage chemical precipitation method. After adding lime milk, flocculants, coagulants, organic sulfur and other chemicals to the wastewater, the solid-liquid separation is carried out in the clarifier. Add hydrochloric acid to adjust to neutrality and then meet the discharge standard. There are some problems in the existing desulfurization wastewater treatment process. Up to the standard, and the cost is high

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Embodiment Construction

[0024] figure 1 Shows the existing treatment process of desulfurization wastewater, the wastewater is treated through neutralization, reaction, flocculation, combined with figure 1 and figure 2 To further illustrate the present invention, a new type of desulfurization wastewater treatment process includes a secondary reaction precipitation process. The process flow is as follows: the wastewater treated by the gypsum cyclone and the vacuum belt dehydrator is collected into the adjustment tank, and after stirring and balancing; The lift pump is pumped from the regulating tank into the first reaction tank of the primary reaction sedimentation tank, and NaOH is added to the wastewater in the first reaction tank to adjust the pH to 10~13, and the waste water overflows into the second reaction tank through the first reaction tank, Lime milk is added to the second reaction tank, and the waste water overflows into the high-load sedimentation tank through the second reaction tank for...

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Abstract

The invention discloses a novel desulfurization waste water treatment method. The novel desulfurization waste water treatment method comprises following steps: waste water is pumped into a first grade reaction sedimentation tank from an adjusting tank using a lift pump, NaOH and lime milk are added so as to remove sulfites, sulfates, and non-metallic suspended matters in waste water, and an obtained sediment 1 is delivered into a sludge buffer tank; waste water is delivered into a second grade reaction sedimentation tank from the first grade reaction sedimentation tank via overflowing, NaOH, a heavy metal chelating agent, and a flocculating agent are added so as to remove heavy metal ions in waste water, and an obtained sediment 2 is delivered into the sludge buffer tank; obtained sludge is subjected to sludge-water separation using a plate-and-frame filter press, an obtained filtrate is delivered back into the waste water adjusting tank, and sludge cake is collected; waste water processed via the second grade reaction sedimentation tank is delivered into a clear water tank, HCl is added so as to adjust pH value to be 7, and then obtained water is discharged or recycled. According to the novel desulfurization waste water treatment method, sludge obtained via sedimentation in the first grade reaction sedimentation tank and the second grade reaction sedimentation tank is delivered into the sludge buffer tank via pipelines, so that system blocking of a processing system caused by large amount of sludge is avoided, and quality of the discharged water is increased.

Description

technical field [0001] The invention relates to the fields of environmental protection and wastewater treatment, in particular to a novel desulfurization wastewater treatment process for treating inorganic mineral sludge and calcified sludge generated from desulfurization wastewater. Background technique [0002] Wastewater produced by wet flue gas desulfurization (limestone / gypsum method) mainly includes suspended solids, supersaturated sulfites, sulfates, heavy metals, and chloride ions. Desulfurization wastewater has the following characteristics: high turbidity, large content of suspended solids, the concentration of suspended solids is as high as 20,000 mg / L, and contains a large amount of heavy metals, sulfates, and sulfites, which are highly corrosive to equipment. The characteristics of desulfurization wastewater itself determine that this type of wastewater is difficult to treat. At present, the conventional wet desulfurization wastewater treatment of power plants ...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F103/18
Inventor 何正新石俊哲郭建军杨菲
Owner JIANGSU YUANNENG ENVIRONMENT ENG
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