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

A technology for heavy metal ions and heavy metals, which is applied in the fields of water/sewage multi-stage treatment, fluid flow condition water treatment, multi-stage water treatment, etc. problem, to achieve the effect of high efficiency of drug use, fast reaction speed, and wide range of pH application.

Active Publication Date: 2015-02-04
TONGJI UNIV
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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 ty...

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

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Embodiment 1

[0030] The reference patent for the preparation of FHC in the present invention (Application No.: 201410028027.1) "Preparation method and application of iron-based material for efficient removal of heavy metals in wastewater", wherein the molar ratio of Fe(II) to Fe(III) is 4:1, The synthesized structured iron suspension is sealed and stored in a medicine tank. In the multi-stage countercurrent reaction integrated process device, industrial wastewater of various heavy metals is synchronously treated. Structural iron is the main functional unit material. The contact time of a single stage is 20-60min. The countercurrent mixing method is used to fully contact and react the medicament and wastewater. , to exert the adsorption and reduction performance of structural iron with high efficiency. Due to the long reaction time between metal pollutants such as arsenic and selenium and structural iron, the simultaneous removal of various heavy metal pollutants can be effectively achieved...

Embodiment 2

[0035] Take a copper mine factory wastewater effluent stock solution, the water quality pH is in the range of 9.3-9.5, which mainly contains heavy metal ions Cu 290-300mg / L, Ni 190-200mg / L, Pb 35-40mg / L, As 40-45mg / L, Se 8-10mg / L. First, pretreat the wastewater: add a certain amount of PAC coagulant to the fast stirring tank 4, stir quickly for 3-5 minutes to mix the added coagulant evenly in the solution, and the waste water enters the slow stirring tank 5, and slowly stir for 10- After 12 minutes, the sediment in the wastewater is coagulated into flocculation. After the flocculation is completed, the wastewater enters the pretreatment sedimentation tank 6 and settles statically for 20-30 minutes to obtain a clarified supernatant. Pretreatment can remove some dissolved substances, reduce some pollutants in wastewater, reduce the influence of interfering substances on subsequent reactions and the discharge of sludge.

[0036] In this example, the concentration of heavy metals...

Embodiment 3

[0039] The effluent stock solution of a smelter was taken, the pH of the water was in the range of 10.0-10.2, which mainly contained heavy metal ions Cu 70-75mg / L, Ni 50-55mg / L, Cr 10-12mg / L, Cd 15-17mg / L, Pb 20-22mg / L, As 2-3mg / L. First, pretreat the wastewater: add a certain amount of PAC coagulant and stir in the fast stirring tank for 3-5 minutes, so that the added coagulant is mixed evenly in the solution, and the wastewater enters the slow stirring tank and stirs for 10-12 minutes to make the wastewater in the The sediment condenses into flocs. After the flocculation is completed, the agitation is stopped, and the wastewater enters the pretreatment sedimentation tank, and the sedimentation is static for 20-30 minutes to obtain a clear supernatant. Pretreatment can remove some dissolved substances, reduce some pollutants in wastewater, reduce the influence of interfering substances on subsequent reactions and the discharge of sludge.

[0040] In this example, the initial...

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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...

Claims

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Application Information

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IPC IPC(8): C02F9/04
CPCC02F1/52C02F9/00C02F2101/20C02F2301/00C02F2301/02C02F2301/08C02F2305/04
Inventor 张亚雷吴德礼陈英代朝猛储华强
Owner TONGJI UNIV
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