Electric flocculation method and device for recovering and processing desulfurized wastewater

A technology for desulfurization wastewater, recycling and treatment, applied in water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc. It can solve the problem of increasing flue gas humidity or HCl content, low temperature corrosion of electrostatic precipitators, and high investment. problem, to achieve the effect of wide processing range, good processing effect and high processing capacity

Active Publication Date: 2010-09-01
华电水务工程有限公司
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, some power plants in the United States use the flue gap between the electrostatic precipitator and the air heater to heat and evaporate the desulfurization wastewater. The wastewater evaporates into water vapor and enters the flue, and the solid particles are removed by the electrostatic precipitator. Increased flue gas humidity or HCl content will cause low-temperature corrosion to the electrostatic precipitator. In addition, too much desulfurization wastewater may af

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  • Electric flocculation method and device for recovering and processing desulfurized wastewater
  • Electric flocculation method and device for recovering and processing desulfurized wastewater
  • Electric flocculation method and device for recovering and processing desulfurized wastewater

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Embodiment 1

[0084] Embodiment 1 of the present invention: a method for electrocoagulation recovery and treatment of desulfurization wastewater: desulfurization wastewater is collected into the electrocoagulation reactor, and a sensitizer is added to the electrocoagulation reactor by a medicament addition system at a rate of 0.2 kg / ton of water (water Commonly used sensitizers in the treatment field, purchased from the market), the pH value in the reactor is controlled at 5-8, the working pressure is 0.2-0.5Mpa, the working water temperature

[0085] 10-20°C; then use the inclined plate to strengthen the air flotation device for solid-liquid separation, add polyacrylamide (PAM) 2PPM to the solid-liquid separation system through the chemical addition system, the air-water ratio of the air flotation device is 11:1, and the separation Area surface load 8 ~ 12m 3 / (h.m 2 ); the separated clarified effluent is returned to the ash flushing system of the power plant, and the sludge is transporte...

Embodiment 2

[0093] Embodiment 2 of the present invention: the method for electrocoagulation recovery and treatment of desulfurization wastewater: desulfurization wastewater is collected into the electrocoagulation reactor, and a sensitizer (purchased on the market) is added to the electrocoagulation reactor by 0.2 kg / ton of water through the medicament addition system ), the PH value in the reactor is controlled at 4-9, the working pressure is 0.1-0.6Mpa, and the working water temperature is 5-15°C; then the inclined plate is used to strengthen the air flotation device for solid-liquid separation, and the chemical addition system is added to the solid-liquid separation system Add polyacrylamide (PAM) 2PPM, the air-water ratio of the air flotation device is 10:1, and the surface load of the separation area is 5.4-10m 3 / (h.m 2 ); the separated clarified effluent is directly discharged, the sludge is transported to the sludge treatment system for dehydration, and the effluent of the sludge ...

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Abstract

The invention discloses electric flocculation method and device for recovering and processing desulfurized wastewater. The electric flocculation method for recovering and processing desulfurized wastewater comprises the following steps of: collecting desulfurized wastewater to enter an electric flocculation reactor, then, carrying out solid-liquid separation, recovering the separated clear effluent water in a clinker-flushing system of an electric power plant or directly discharging the separated clear effluent water, conveying the sludge to dewater in a mud-processing system, and returning the effluent water of the mud-processing system to a water intake system. Compared with the prior art, the electric flocculation technology is adopted to substitute a complicated chemical method for recovering and processing the desulfurized wastewater, can effectively remove pollutants in the wastewater, reaches a heavy metal processing rate up to 95-99 percent, a chlorine-processing rate over 80 percent and removal rates of ammonian, and the like over 90 percent, greatly shortens the processing time, improves the processing efficiency and saves the investment cost. Moreover, the electric flocculation processing device has small size, extremely small floor occupation, good environmental-protection performance and low cost without additional flocculating agents.

Description

technical field [0001] Technical field: The present invention relates to a method and device for electrocoagulation recovery and treatment of desulfurization wastewater, which belongs to the technical field of wastewater treatment. Background technique [0002] Flue gas desulfurization is currently the only large-scale commercial application of desulfurization in the world, and it is the main technical means to control sulfur dioxide pollution. Limestone-gypsum method is currently the most widely used flue gas desulfurization method, which can efficiently remove sulfur dioxide in flue gas. The wastewater generated from the boiler flue gas wet desulfurization (limestone / gypsum method) process mainly comes from the gypsum dehydration and cleaning system. The impurities contained in wastewater mainly include suspended solids, supersaturated sulfite, sulfate and heavy metals, many of which are the first category of pollutants that are strictly controlled in the national environ...

Claims

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Application Information

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IPC IPC(8): C02F1/463C02F103/18
Inventor 韩买良沈明忠
Owner 华电水务工程有限公司
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