A heavy metal wastewater treatment and recovery system and method

Abstract

The invention discloses a heavy metal wastewater treatment and recovery system, comprising a chelation reaction device, a coagulation device, a sedimentation tank, a filter device, an air flotation tank, a dissolving device, an ion exchange resin and an electrolytic cell. Coagulation device, sedimentation tank, filter device, air flotation tank, dissolution device, ion exchange resin and electrolytic cell are connected in sequence; the sedimentation tank, filter device and air flotation tank are all connected to the dissolution device. The present invention effectively removes heavy metal ions in wastewater, treats them thoroughly, and discharges them up to standards. At the same time, the chelated sediment obtained after wastewater treatment is rapidly dissolved, and heavy metal ions in the solution are adsorbed by ion exchange resins. When the adsorbed heavy metals When the ions reach saturation, the regeneration solution is eluted with a regenerant to obtain a regeneration solution, so that the obtained regeneration solution contains a high concentration of heavy metal ions, and then the regeneration solution is electrolyzed to recover heavy metal ions to ensure effective electrolysis with high recovery efficiency, energy saving and environmental protection.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, in particular to a system and method for treating and recovering heavy metal wastewater. Background technique [0002] With the rapid development of industry, the pollution of heavy metals to water resources is becoming more and more serious, and heavy metal ions have the characteristics of accumulation and non-biodegradability, which cause great harm to ecosystems and human health. [0003] Heavy metals are a class of potentially harmful pollutants in the environment, which cannot be decomposed by microorganisms in the environment. On the contrary, organisms such as fish can be rich in heavy metals, causing heavy metals to accumulate in the environment, and even some heavy metals are under the action of microorganisms It can also be transformed into more toxic organic compounds. The horror of heavy metal pollution lies in the long-term nature of its harm. In the initial stage of he...

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Problems solved by technology

[0012] In this patent, after coagulation and chelation reactions are carried out on wastewater, the obtained chelated sediment enters the electrolytic cell directly, and the heavy metal ions in the chelated sediment are recovered by electrolysis. Since the heavy metal ions have formed stable chelated compounds with the chelating agent, Directly electrolyze it, the electrolysis effect is poor, and the recovery of heavy metals is not complete, and the amount of heavy metal recovery is small, especially when the heavy metal ion recovery is carried out by electrolysis, if the concentration of heavy metal ions is low, concentration polarization will occur, and the current efficiency is low , resulting in the inability to electrolyze low-concentration solutions, etc.

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