Treatment process for heavy metal wastewater

Abstract

The invention discloses a treatment process for heavy metal wastewater. The process includes the steps of: collecting wastewater by a collection pool, introducing wastewater in the collection pool into an oil separation pool to conduct oil removal, then making the wastewater enter a comprehensive regulation pool, adding a small amount of air and conducting stirring to obtain uniform water quality, bringing the effluent water from the comprehensive regulation pool into a pH regulation pool I, adding liquid alkali to regulate the pH value to 8.0-10.0, letting the effluent water from the pH regulation pool I enter a tubular ultrafiltration membrane system by a concentration groove to undergo a filtration treatment, leading the effluent water from the tubular ultrafiltration membrane system to a pH regulation pool II and adding an acid to perform neutralization, making the neutralized effluent water enter an RO membrane system, carrying out filtration treatment by an RO membrane so as to obtain recyclable effluent water. The tubular ultrafiltration membrane adopted in the invention employs a Duraflow tubular ultrafiltration membrane (DF membrane), and makes use of pressure and speed to achieve solid-liquid separation with no need of a flocculation pool and a reaction pool, so that the land area and the reagent are saved. As the DF membrane has a pore size of less than 0.03 micrometer and a special decontamination ability, clear water can be output after sewage enters the membrane tube, metals, TSS and COD can be removed by as single step, and the effluent water passing the DF membrane can be directly enter the RO membrane system.

Description

Technical field: [0001] The invention relates to a wastewater treatment process, in particular to a heavy metal wastewater treatment process with good purification effect and pollution reduction. Background technique: [0002] Metal pollution refers to environmental pollution caused by heavy metals or their compounds. It is mainly caused by human factors such as mining, exhaust gas discharge, sewage irrigation and use of heavy metal products. Heavy metal pollution is different from the pollution of other organic compounds. Many organic compounds can be purified physically, chemically or biologically in nature to reduce or eliminate their harmfulness. However, heavy metals are enriched and difficult to degrade in the environment. At present, during the mining, smelting and processing of heavy metals in our country, many heavy metals such as lead, mercury, cadmium, cobalt, etc. enter the atmosphere, water, and soil, causing serious environmental pollution, such as mercury wit...

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Problems solved by technology

[0003] In practice, a treatment method for heavy metal wastewater has also been invented. Take the patent number: 200910105943.X published by the State Intellectual Property Office, "A Treatment Method for Heavy Metal Industrial Wastewater" as an example. Type microfiltration, reverse osmosis process for treatment, this treatment method does not require chemical sedimentation tanks to save floor area and reduce investment, but the existing tubular microfiltration membrane cannot achieve 100% filtration, and this filtration method only replaces precipitation The role of ultrafiltration can not play a role

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