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Treatment system for removing heavy metals in wastewater

A treatment system and heavy metal technology, applied in water/sewage treatment, multi-stage water/sewage treatment, biological water/sewage treatment, etc., can solve problems such as high cost, long development time of chemical precipitation method, and consumption of large doses of chemicals , to achieve the effect of saving cost, saving dosage and low cost

Pending Publication Date: 2022-06-21
浙江台州津源环境科技有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The adsorption method produces a lot of solid waste, and the biological method cannot treat heavy metals with a higher concentration, while the membrane separation technology only concentrates the heavy metals, but does not actually remove or fix the heavy metals, and still needs to deal with the membrane dope
[0005] Therefore, the chemical precipitation method is the main mature treatment process, which converts heavy metal ions in water into low-solubility heavy metal compounds through chemical reactions, and then uses filtration to remove heavy metal compounds in the aqueous solution. The chemical precipitation method has a long development time and a mature process , usually the neutralization method uses sulfide precipitation, but consumes a large amount of chemicals and is expensive

Method used

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  • Treatment system for removing heavy metals in wastewater
  • Treatment system for removing heavy metals in wastewater
  • Treatment system for removing heavy metals in wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0045] The influent water quality of a certain electroplating wastewater is shown in Table 1. It has a relatively high sulfate concentration, while the COD concentration is relatively low. COD: sulfate = 1:2 (mass ratio), and the amount of backflow water and the amount of influent water are kept at 1: 1 (volume ratio), add glucose as a carbon source, after mixing COD: sulfate = 2.8 (mass ratio), maintain the anaerobic reactor, the sludge concentration is 10.5g / L, pH is maintained at about 8.2, the reaction The temperature is 32℃, the hydraulic retention time of the anaerobic biochemical reactor is 24 hours, PVDF hollow fiber membrane is used, the membrane pore size is about 0.04μm, the membrane flux is 5L / h, and the aeration intensity is maintained at 60m 3 / m 2 h. The degassing tower uses sodium hydroxide as the lye. The sulfide solution after lye absorption is directly added and mixed with raw water to remove Ni ions and Cu ions. After precipitation of heavy metals in the...

Embodiment 2

[0049] The influent water quality of a certain electroplating wastewater is shown in Table 2, the sulfate concentration is 3400 mg / L, COD: sulfate = 1:1.5 (mass ratio); the amount of reflux water and the influent water are kept at 1:1 (volume ratio), adding Sugar and sugar are added as carbon source. After mixing, COD:sulfate = 3.5 (mass ratio), maintain the anaerobic reactor, the sludge concentration is 8.4g / L, the pH is maintained at about 7.6-8.0, the reaction temperature is 32 ℃, and the anaerobic reactor is maintained. The hydraulic retention time of the oxygen biochemical reactor is 24 hours, PVDF hollow fiber membrane is used, the membrane pore size is about 0.04 μm, the membrane flux is 5L / h, and the aeration intensity is maintained at 60m 3 / m 2 h. The degassing tower uses sodium hydroxide as the lye. The sulfide solution after lye absorption is directly added and mixed with raw water to remove Ni ions and Cr ions. After the heavy metals are precipitated in the mix...

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Abstract

The invention relates to a treatment system for removing heavy metals in wastewater. The system comprises a heavy metal reaction tank (1), a solid-liquid separation tank (2), an anaerobic biological reaction tank (3) and a degassing tower (4) which are circularly connected, the system further comprises a gas storage tank (5) connected with the degassing tower (4) and a membrane tank (6) circularly connected with the anaerobic biological reaction tank (3), and the membrane tank (6) is connected with the gas storage tank (5) and the degassing tower (4). The heavy metal reaction tank (1) is provided with a wastewater inlet for introducing heavy metal-containing wastewater, an alkali liquor inlet for introducing an absorption liquid in the degassing tower (4) and a reaction liquid outlet for introducing a reaction liquid into the solid-liquid separation tank (2). Compared with the prior art, the method has the advantages that addition of sulfide is avoided, and heavy metal and organic matter COD are removed at the same time.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a treatment system for removing heavy metals in waste water. Background technique [0002] The main source of heavy metal pollution is industrial pollution, followed by traffic pollution and domestic waste pollution. Most industrial pollution is discharged into the environment through waste residue, waste water and waste gas, and is enriched in humans, animals and plants, thus causing great harm to the environment and human health. [0003] The treatment technology of heavy metal ions in water is mainly divided into four categories: physical chemical method, adsorption method, microbial method and membrane separation technology. [0004] The adsorption method produces a lot of solid waste, and the biological method cannot handle high concentrations of heavy metals, and the membrane separation technology only concentrates the heavy metals, and does not actually remove or fix the h...

Claims

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Application Information

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IPC IPC(8): C02F9/14B01D53/52B01D53/78C02F101/20C02F101/10
CPCC02F9/00B01D53/52B01D53/78C02F3/28C02F3/345C02F1/5236C02F1/5245C02F1/56C02F1/44C02F2101/20C02F2101/101
Inventor 王蕾
Owner 浙江台州津源环境科技有限公司
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