Treatment method of acid heavy metal wastewater

Abstract

The invention provides a treatment method of acid heavy metal wastewater, comprising the following steps of: removing massive impurity of the wastewater by the means that the wastewater passes through grids, and adjusting the pH to 8-9; adding 20-80mg / L heavy metal collecting agent before entering a coagulating floatation tank, and adding 0.5-4.0mg / L biological flocculants before entering the floatation tank; removing organic matter, heavy metal and suspended solids by means of cavitation air floatation; subsiding the water discharged in an air floatation way by a wobble plate, and filtering in a continuous microfiltration device to remove suspended solids and colloid; concentrating air floatation slag by the sludge of a floatation slag tank and a sedimentation tank, putting 20-60mg / L cationic polyacrylamide, and recovering in a drying way; and adding 1320kg of deionized water, 400kg of sodium hydroxide and 380kg of polyethylenimine into the reaction kettle, controlling the temperature of the reaction kettle to be below 25 DEG C, slowly and dropwise adding 1008kg of carbon disulfide, and cooling to room temperature to obtain the heavy metal collecting agent of orange viscous liquid.

Description

technical field [0001] The invention relates to sewage treatment technology in the field of resources and environment, in particular to a systematic treatment process for acidic heavy metal wastewater and the preparation of a heavy metal scavenger. Background technique [0002] As early as the early 1950s, the pollution of heavy metals to the environment had attracted worldwide attention, especially the "Minamata disease" caused by Hg pollution in Japan and the "bone pain disease" caused by Cd pollution, as well as in Japan. After some European countries discovered the serious consequences of heavy metal pollution one after another, people have paid much attention to the research on heavy metal pollution and its prevention and control; Pollution sources are constantly emerging. Due to technical limitations, some wastewater cannot be effectively treated, causing serious pollution to the environment. Therefore, the status quo of heavy metal pollution is extremely severe. Due t...

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Problems solved by technology

However, sodium sulfide is highly toxic, and heavy metals to remove chelates must be used within a narrow pH range; Chinese patent application number is 201110039652.2 The ion exchange method is used for the treatment of wastewater containing heavy metal ions such as copper, nickel, and zinc, and its treatment capacity is small , high toxicity, and heavy metals with recovery value are feasible; but because ion exchange resins are expensive and regeneration requires operating costs, therefore, they are rarely used in general wastewater treatment

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