Process method for heavy metal wastewater treatment

A technology of wastewater treatment and process method, which is applied in water/sewage treatment, neutralized water/sewage treatment, reduced water/sewage treatment, etc. Easy to block and other problems, to solve the plate passivation, reduce the frequency of system maintenance, ensure smooth and stable effect

Inactive Publication Date: 2016-12-14
CHANGSHA HASKY ENVIRONMENTAL PROTECTION TECH DEV CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, although this process method has many application advantages compared with other heavy metal wastewater treatment methods, there are still some types of heavy metal wastewater in the actual application process. It is easy to block the follow-up process pipeline, and the effect of the follow-up flocculation and sedimentation system is unstable, etc.

Method used

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  • Process method for heavy metal wastewater treatment
  • Process method for heavy metal wastewater treatment

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Embodiment 1

[0040] A process method for heavy metal wastewater treatment of the present invention, such as figure 1 As shown, the heavy metal wastewater used is the pretreated production wastewater of a lead-zinc smelting enterprise, mainly including the acidic heavy metal wastewater clear liquid after lime neutralization and pretreatment. The process method comprises the following steps:

[0041] (1) Send the pretreated heavy metal wastewater supernatant (that is, the heavy metal wastewater pretreatment supernatant) into the intermediate pool, and the intermediate pool clear liquid is 50m 3 The amount of water per hour is discharged into the electrochemical equipment for electrochemical reaction. The SS in the clear liquid is ≤200mg / L, the pH is 7~11, the total amount of heavy metals is ≤100mg / L, and 1.7m 3 / min of air for intermittent aeration, each intermittent aeration air charge is 2 times the amount of wastewater treatment by electrochemical equipment, that is, the volume ratio of ...

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Abstract

The invention discloses a process method for heavy metal wastewater treatment. The process method comprises the following steps: performing electric-chemical reaction on pretreated heavy metal wastewater clear liquid, performing intermittent aeration in the reaction process, performing settling separation on the obtained product, removing iron-containing solid residues, performing aeration reaction on the obtained turbid liquid, adding a coagulant for coagu-flocculation reaction into the obtained mixed liquid so as to form and settle alum floc, performing solid-liquid separation, recycling or performing up-to-standard discharge on the obtained supernate, and performing aftertreatment on the obtained bottom mud, thereby completing treatment on heavy metal wastewater. The process method disclosed by the invention is good in heavy metal treatment effect, the polar plate passivation problem can be effectively solved, the polar plate utilization rate is high, and the process operation is stable and smooth.

Description

technical field [0001] The invention belongs to the technical field of heavy metal wastewater treatment, and in particular relates to a process method for heavy metal wastewater treatment. Background technique [0002] Electrochemical wastewater treatment technology, as an environmentally friendly water treatment technology, is currently widely used in the field of heavy metal wastewater treatment. This technology has simple process, small footprint, good operation effect, low cost, and has a good effect on the removal of heavy metals. It can effectively remove heavy metal ions in water and make them completely discharge up to the standard. It can be used to remove cadmium, arsenic, and antimony. , copper, zinc, mercury, silver, nickel and other heavy metal ions, the electrochemical system can combine heavy metal ions into solid particles in the most stable way through electrolytic coagulation, electrolytic air flotation and electrolytic redox , precipitated from the water ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F101/20
CPCC02F1/461C02F1/467C02F1/469C02F1/56C02F1/66C02F1/70C02F1/72C02F9/00C02F11/12C02F11/121C02F2001/007C02F2101/20
Inventor 蒋晓云徐先锋
Owner CHANGSHA HASKY ENVIRONMENTAL PROTECTION TECH DEV CO LTD
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