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Heavy metal waste water continuous treating method and treating device thereof

A treatment method and a technology of a treatment device, applied in water/sewage treatment, multi-stage water/sewage treatment, neutralized water/sewage treatment, etc., can solve the problem of difficult recovery of heavy metal residues, difficulty in meeting discharge standards, secondary pollution of the environment, etc. problems, to achieve the effects of small footprint, low operating costs and energy consumption, and good water quality

Inactive Publication Date: 2010-02-10
KUSN HUAKE INST OF BIOPOLYMER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, chemical agents such as polyaluminum chloride, polyacrylamide, ferric chloride, and sodium sulfide are generally used as flocculants and coagulants. These agents are relatively toxic and will cause secondary pollution to the environment.
The concentration of heavy metal ions in the clean water obtained after treatment is still high, and the pH value of the water is alkaline, the water quality is poor, and it is difficult to meet the national discharge standards; the sludge obtained through preliminary solid-liquid separation is centrifuged, and it takes Chemical coagulants and precipitants are added, so the heavy metal residues obtained after solid-liquid separation are often difficult to recover
[0004] In the prior art, there are many devices and equipment for heavy metal wastewater treatment, which occupy a large area and consume a lot of energy, and most of them only transfer pollutants

Method used

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  • Heavy metal waste water continuous treating method and treating device thereof
  • Heavy metal waste water continuous treating method and treating device thereof

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Embodiment Construction

[0024] The present invention is further illustrated below by way of examples.

[0025] as attached figure 1 And attached figure 2 As shown, the heavy metal-containing wastewater enters the treatment device of the present invention from the wastewater inlet 17, and first completes the pretreatment in the wastewater storage tank 3. This pretreatment step includes adjusting the pH value of the wastewater and flocculating using a biological flocculant to settle metal ions in the wastewater. Therefore, the waste water storage tank 3 includes a liquid alkali storage tank 4 , a flocculant storage tank 6 and an electric mixer 5 . A pH value detection and feedback device is set at the bottom of the waste water storage tank 3, and according to the detected pH value of the waste water, lye is added from the liquid alkali storage tank 4 to the waste water stored in the waste water storage tank 3, Adjust the pH of the wastewater to 6.5-7.0. The γ-polyglutamic acid biological flocculan...

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Abstract

The invention provides a continuous processing method of heavymetal wastewater for obtaining clean water with high water quality and recovering heavy metals and a processing device thereof. The processing method first adopts bio-flocculant to flocculate the heavymetal wastewater during the pretreatment; one part of supernatant separated after flocculation is filtered by a filtering device which adopts Gamma-poly glutamate complex film as a filter element so as to obtain the clean water which can be directly discharged while the other part of the supernatant wrapped with sludge of the filter element enters a solid-liquid separation step; a vertical plate and frame filter press is employed to carry out the solid-liquid separation on the sludge separated out after the pretreatment and filtration, and the separated heavy metal slag is recovered and reused while the separated effluent is again treated with filtration. The clean water obtained by the treatment of the invention has high waterquality; the heavy metal slag is easy to be recovered; the bio-flocculant used is nonpoisonous and degradable and the environment-friendly Gamma-poly glutamate complex film with biodegradability canbe reused through backwashing technique.

Description

technical field [0001] The invention relates to a continuous treatment method for heavy metal wastewater and a treatment device thereof. Background technique [0002] The heavy metal wastewater treatment method in the prior art generally includes the following steps: pretreating the wastewater, adjusting the pH, and adding a flocculant and a coagulant to make the heavy metal ions in the wastewater settle down in solid form to obtain a supernatant and a sedimentation solution. The supernatant and sediment are further separated into solid and liquid by filtration and centrifugation to obtain clean water and heavy metal residues. [0003] In the prior art, chemical agents such as polyaluminum chloride, polyacrylamide, ferric chloride and sodium sulfide are generally used as flocculants and coagulants. These agents are relatively toxic and will cause secondary pollution to the environment. The concentration of heavy metal ions in the clean water obtained after treatment is stil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/02C02F1/62C02F1/66C02F1/52C02F9/14
Inventor 郭大磊吴自荣孙玉华
Owner KUSN HUAKE INST OF BIOPOLYMER
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