Heavy metal complexing wastewater treatment equipment and method

Abstract

The invention discloses heavy metal complexing wastewater treatment equipment and method. The equipment consists of a tail gas absorption part, an electrocatalytic oxidation part and a precipitation part in sequence from top to bottom. The tail gas absorption part comprises a tail gas absorption chamber, a water distribution pipe, a water distribution pipe bearing sieve plate, filler, a filler bearing sieve plate and a first drainage tank. The electrocatalytic oxidation part comprises an electrocatalytic oxidation chamber, an anode plate, a cathode plate, an anode binding post, a cathode binding post, a polar plate bearing sieve plate, a gas distribution pipe, a gas distribution pipe bearing sieve plate and a second drainage tank. The precipitation part comprises a precipitation chamber, awater collecting hopper, a sludge collecting hopper and a third drainage tank. Waste gas generated by electrocatalytic oxidation is treated through the tail gas absorption part, and up-to-standard emission of tail gas is guaranteed; the electrocatalytic oxidation part can synchronously remove a complexing agent and heavy metals in the wastewater; and in a filtering part, sulfide, a heavy metal capturing agent, an inorganic flocculating agent and organic flocculation are not required to be added, so that the metal grade in the heavy metal precipitate is high, and the heavy metal precipitate can be directly recycled.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a heavy metal complex wastewater treatment equipment and method. Background technique [0002] With the development of the metal surface treatment industry, the types and quantities of heavy metal complex wastewater are increasing day by day, among which copper and nickel are the most common heavy metals, and complexing agents include a variety of organic acids, organic amines, ammonia nitrogen and Cyanide, the complexity of the complexation system increases the difficulty of heavy metal treatment, limited by the technical level and treatment cost, the discharge of substandard wastewater will bring serious ecological and environmental problems. [0003] At present, the common heavy metal complex wastewater treatment technologies in China include the following: [0004] a. Precipitation separation method [0005] First, use lime or other alkaline agents (such as sod...

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Problems solved by technology

[0008] Both the precipitation separation method and the oxidation decomposition + precipitation separation method focus on the removal of heavy metals. There are many types of chemicals to be added, the treatment steps are cumbersome, and the amount of sludge generated is huge. The heavy metals in the sludge are of low grade, so it is difficult to utilize them as resources. cause secondary pollution

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