Extremely-high concentration multi-species heavy metal waste liquid treatment method and apparatus

Abstract

The invention discloses a treatment method of high concentration and multi-class heavy metal waste liquid and the device used for realizing the method, belonging to the technical field of waste water and liquid treatment. The main technology is oxidation-reduction, sedimentation and filtration and magnetic absorption. Firstly, the waste liquid is pumped into the oxidation-reduction pool, and the reagent for the heavy metal ion is put into the oxidation-reduction pool; secondly, the PH value is readjusted after reaction and the water enters into the observation pool; if the effluent water is not up to the standard, the effluent water is reflowed into the oxidation-reduction pool for further treatment; if the concentration of heavy metal ion in the waste liquid exceeds the designed concentration, part of the water in the observation pool is reflowed to maintain the concentration; if the concentration of heavy metal ion exceeds certain value or the ion classes are complicated, the high-efficiency absorption system is started for further absorbing and removing the remained heavy metal ion. The treatment method has the advantages of adopting PLC intelligent reagent feeding system, reducing reagent consumption, deacidizing and depositing Cr<6> in alkali condition, saving consumption of acid and alkali reagent and operation expense, ensuring standard quality of effluent water of the system in extreme condition with novel high-efficiency magnetic adsorbent. The device has the advantages of ability of treating the waste liquid with extremely high concentration and multi-class heavy metal, simple technology, good quality of effluent water, compact arrangement of device and convenient automatic control.

Description

technical field [0001] The invention relates to a method and device for treating waste liquid, in particular to a method for treating waste liquid with extremely high concentration and various types of heavy metals and a device for realizing the method, belonging to the technical field of waste water and waste liquid treatment. Background technique [0002] For a long time, my country's water environment has been facing the dual pressure of water pollution and water resource shortage. my country's per capita water resources are less than 2700m 3 , only accounts for 1 / 4 of the world's per capita water resources, and is listed by the United Nations as one of the 13 most water-scarce countries in the world. In recent years, due to the rapid development of industry, water pollution has become increasingly serious. 82% of rivers in our country have been polluted to varying degrees, and more than 65% of people drink polluted water. Water pollution further exacerbates the shortag...

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Problems solved by technology

The removal methods, precipitation conditions, and solubility products of various heavy metal ions are different, and even some ions will produce chelates after mixing, so that traditional sing

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