Heavy metal waste water continuous treating method and treating device thereof

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...

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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

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