Method for removing low-concentration heavy metal by embedding heat-inactivation activated sludge with sodium acetylide

A low-concentration heavy metal, activated sludge technology, applied in chemical instruments and methods, water/sludge/sewage treatment, water/sewage treatment, etc. Large-scale operation and other problems, to achieve the effect of strong adsorption of mixed heavy metals, simple immobilization process and good pore structure

Inactive Publication Date: 2005-11-30
JIANGSU PROVINCIAL ACAD OF ENVIRONMENTAL SCI
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Problems solved by technology

These traditional methods have a common disadvantage: when used to treat low-concentration heavy metal wastewater with a content of 1-100 mg / L, the operating costs and raw material costs are relatively high, which is not economically cost-effective
However, several or more metal ions often coexist in water, and the wastewater treatment reactor is an open system, so it is difficult to use pure microorganisms
More importantly, organisms in a dispersed state cannot be operated on a large scale due to fine particles, low mechanical strength, and difficulty in solid-liquid separation.

Method used

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  • Method for removing low-concentration heavy metal by embedding heat-inactivation activated sludge with sodium acetylide

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Embodiment Construction

[0022] As can be seen from Fig. 1, the specific implementation method of the method of the present invention is:

[0023] 1. Heavy metal wastewater treatment

[0024] The fixed bed reactor consists of two reactors 4-1 and 4-2 running in parallel, alternately performing adsorption and regeneration operations. In the fixed-bed reactor, the spherical adsorbent (CA) is filled in the fixed-bed reactor in a fixed-bed manner, and the wastewater containing heavy metals is slowly pumped into the bed from the bottom to the top of the storage tank 1, and the adsorbent and the heavy metal ions The wastewater undergoes dynamic adsorption, and the adsorbed wastewater enters the storage tank 5 . Determination of the residual amount of various heavy metals in the water.

[0025] 2. Desorption of heavy metal ions

[0026] The fixed-bed reactor after adsorption is switched with a three-way valve, and then the hydrochloric acid eluent from the eluent storage tank 6 is used for elution regener...

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Abstract

The low concentration heavy metal removal method by sodium alginate embedding heat-activated activated sludge, which pertains to heavy metal waste water disposal method, comprises the following steppes: treating the activated sludge from municipal sewage plant with scouring, centrifugal separation and drying under pressurization to deactivate it; embedding it with sodium alginate(CaCl2) to get immobilization calcium alginate ball(CA); filling fixed reactor with CA in certain density; continuously treating low concentration waste water containing mixing heavy metal such as Cd2+, Pb2+, Cu2+ and Zn2+; and selectively washing CA ball by hydrochloric acid to get mixing heavy metal adsorbed on CA ball. Heavy metal is retained while sorbent material revived to reuse. The invention has the advantages of high efficiency and economical and practical property.

Description

technical field [0001] The invention relates to a method for removing Cd-containing activated sludge by embedding heat-inactivated activated sludge with sodium alginate 2+ , Pb 2+ 、Cu 2+ , Zn 2+ The method for treating low-concentration heavy metal wastewater belongs to the metal wastewater treatment method. Background technique [0002] Industrial wastewater containing heavy metal ions mainly comes from machinery processing, mining industry, smelting of steel and non-ferrous metals, textile, printing and dyeing, chemical fiber and other industries. The heavy metal wastewater containing lead, chromium, nickel, copper, etc. produced by these industries is highly toxic, which not only poses a threat to aquatic organisms, but also can eventually endanger human health through the food chain. With the development of electroplating, tanning, dye and anti-corrosion industries, the pollution of heavy metals to the human body is becoming more and more serious. Therefore, how to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/62
Inventor 吴海锁夏明芳李国平张利民张爱茜
Owner JIANGSU PROVINCIAL ACAD OF ENVIRONMENTAL SCI
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