Multistage countercurrent reaction integration technology and device for synchronous removal of a plurality of heavy metal ions

Abstract

The invention relates to an integration technology for synchronous removal of a plurality of heavy metal ions by use of structure state iron; pretreated heavy metal wastewater is introduced into a structure state iron-vertical multistage reaction system, the suitable reactor stage is adopted according to properties of the wastewater and kinds and concentrations of heavy metals in the wastewater; a medicament and the wastewater are fully contacted and mixed for reaction in a mixing reaction pool in the manner of countercurrent mixing, then the solution enters into a sedimentation tank of a reactor of the stage to achieve solid-liquid separation; after separation, the supernatant is detected, until the supernatant achieves discharge standard, the effluent is discharged; if the effluent does not achieve the discharge standard, the effluent continues to enter into a reactor of next stage for repeated wastewater treatment, until the effluent achieves the discharge standard; the medicament is the structure state iron. The structure state iron-vertical multistage reaction system includes a rapid mixing pool, a slow mixing pool, a pretreatment sedimentation tank and a multistage pretreatment reactor, has the advantages of simple operation, capability of continuously performing multi-stage reaction, small occupation area, high treatment efficiency, and short reaction time, can simultaneously remove the heavy metals, reduces the application cost, and has promotion and application prospect.

Description

technical field [0001] The invention belongs to the field of water pollution control, and in particular relates to a multi-stage countercurrent reaction integrated process and device for synchronously removing various heavy metal ions. Background technique [0002] Heavy metal wastewater mainly refers to the heavy metal-containing wastewater discharged from industrial production processes such as mining industry, machinery processing manufacturing industry, chemical industry, iron and steel and non-ferrous metal smelting. Heavy metal (such as cadmium, nickel, mercury, zinc, arsenic, etc.) wastewater is one of the most serious environmental pollution and one of the most harmful industrial wastewater to humans. It has the characteristics of high toxicity, accumulation, and persistence. Heavy metals discharged into the environment Not easy to be degraded, easy to be bioaccumulated. Serious threat to human health and ecological environment safety. [0003] At present, the meth...

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Problems solved by technology

The unique reduction and adsorption capacity of structural iron enables it to efficiently remove heavy metals in water bodies. The patent (application number: 201410028027.1) "Preparation method and application of an iron-based material for efficient removal of heavy metals in wastewater" mentions that structural iron can The adsorption and reduction of pollutants, precipitation and coagulation, etc., have a significant removal effect, but for the initial conditions of complex water quality (such as pH, heavy metal types, concentration range, etc.), no efficient and low-cost integrated process device has been proposed to synchronize Removes a variety of pollutants

At present, many iron-based materials at home and abroad, such as nano-iron, patina, and ferrous sulfide, have certain research on heavy metal-containing wastewater. Because iron-based materials have different reaction conditions for different heavy metals, it is more difficult for wastewater containing a variety of heavy metals. Difficult to deal with all the standards at once

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