Settling basin for treating high-concentration heavy metal industrial wastewater

Abstract

The invention discloses a settling basin for treating high-concentration heavy metal industrial wastewater that comprises the settling basin and a mud scraper arranged on the settling basin, wherein the mud scraper comprises a rail, a walking device, a lifting mechanism and a mud scraping plate; the walking device comprises walking wheels and a connecting bridge; the mud scraping plate comprises a front mud scraping plate and a rear mud scraping plate; the front mud scraping plate and the rear mud scraping plate are in up-and-down movable connection with each other; the lifting mechanism comprises a first lifting cylinder, a second lifting cylinder, a front fixing rod, a rear fixing rod and a lifting bridge; one end of the first lifting cylinder is connected with connecting bridge while the other end is connected with the lifting bridge; one end of the front fixing rod is connected with the lifting bridge while the other end is connected with the front mud scraping plate; the second lifting cylinder is arranged between the rear fixing rod and the lifting bridge; the rear mud scraping plate is connected with the lower end of the rear fixing rod. The invention has the advantages of excellent mud scraping effect, high speed and capability of thoroughly removing the sludge at the bottom of the settling basin; sludge is difficult to raise and the secondary floating diffusion phenomenon of the sludge is avoided; the heavy metal is effectively flocculated; the secondary pollution of the heavy metal to soil is avoided; the service life is long.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a settling tank for treating high-concentration heavy metal industrial sewage. Background technique [0002] In the sewage treatment system, it mainly includes sedimentation, biochemical, adsorption, neutralization and other processes. Sedimentation is an indispensable sewage purification step, which is used to settle and separate the sludge with finer particles. The sedimentation tank needs to be removed in time after the sedimentation is completed. Sludge, especially the secondary settling tank, otherwise the organic sediment is prone to anaerobic fermentation, resulting in reduced sludge quality and easy floating, and at the same time produces a foul smell, further deteriorating the water quality, such as an increase in the soluble BOD value in the effluent; a decrease in the pH value Wait. The sewage discharge period in the settlement tank is generally 2 days, and the settled...

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Problems solved by technology

[0003] The existing settling tanks have the following problems in the treatment of high-concentration heavy metal industrial sewage: 1. The heavy metal content is high. On the one hand, it is corrosive to the mud scraper, and the mud scraper is easy to corrode and wear; 2. The settled sludge is rich in heavy metals. Direct discharge of sludge will cause secondary pollution to the soil; 3. There is no effective mud scraper on the existing sedimentation tank, resulting in poor mud scraping effect. The mud scraper does not consider the actual characteristics of the sedimentation tank. The water content of the mud is high and the sludge is finer, so the scraper board is easy to stir the settled sludge when scraping, resulting in secondary pollution of the water quality and serious mud lifting; Unfavorable water quality

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