Three-stage biodegradation method for treating heavy metals

A biodegradation and heavy metal technology, applied in chemical instruments and methods, biological water/sewage treatment, water/sewage treatment, etc., can solve problems such as incineration, environment, production and life impact, and achieve low cost, convenient operation and management, The effect of large specific surface area

Inactive Publication Date: 2017-12-08
CENT SOUTH UNIV
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  • Application Information

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Problems solved by technology

Most of these wastes are directly discarded, and some are incinerated, which has a great impact on the environment, production and life

Method used

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  • Three-stage biodegradation method for treating heavy metals

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Embodiment

[0016] Example: such as figure 1 As shown, the implementation mode: a "three-stage method" biodegradation method for controlling heavy metals, the steps are as follows:

[0017] 1. The heavy metal wastewater is fed from the bottom of the straw tank, and the flow rate is controlled to ensure an effective adsorption time of 3 hours. In order to improve the adsorption performance of straw, it needs to be chemically modified to increase its active groups;

[0018] 2. The clear liquid flowing out of the straw trough enters the constructed wetland system, and uses its unique substrate-plant-microbial ecosystem to reduce heavy metals in wastewater through adsorption, precipitation and enrichment;

[0019] 3. Then enter the aerobic tank, and further reduce the heavy metal content through the surface complexation, biosorption and flocculation of microorganisms in the activated sludge to meet the discharge standard.

[0020] The heavy metal content in the heavy metal wastewater treate...

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Abstract

The invention discloses a three-stage biodegradation method for treating heavy metals. The three-stage biodegradation method comprises the following steps: 1) allowing discharged heavy metal wastewater to enter a straw tank from the bottom of the straw tank, and properly controlling the flow rate of inflow water so as to ensure 3-hour effective adsorption time; 2) allowing clear liquid flowing out from the straw tank to enter a constructed wetland system, and reducing heavy metals in the wastewater through the adsorption, precipitation, enrichment and other effects of a unique matrix-plant-microbial ecosystem of the constructed wetland system; and 3 ) allowing the wastewater treated by the constructed wetland system to enter an aerobic pond and further reducing the content of heavy metals in the wastewater through the surface complexation, biological adsorption and flocculation effect of microorganisms in activated sludge in the pond. The method adopts waste straw-aquatic plant-microorganism three-stage biodegradation for treatment of heavy metal wastewater and has the advantages of effective utilization of agricultural waste, low cost, thorough treatment of heavy metals, environment friendliness, no secondary pollution, simple process and convenient operation and management.

Description

technical field [0001] The invention relates to the field of heavy metal sewage treatment, in particular to a "three-stage method" biodegradation method for treating heavy metals. Background technique [0002] At present, heavy metal wastewater has a wide range of sources and a large amount of water. Heavy metal wastewater mainly comes from industries such as electroplating, mining, chemical industry, electrolysis, pesticides, medicine, tobacco, paint, and pigments. This type of wastewater has the characteristics of long-term toxic effects and non-biological degradation. It enters the human body through the food chain and accumulates in the human body, causing various diseases and dysfunction, and finally causing serious harm to human health. With the rapid development of my country's industry, a large amount of heavy metal wastewater is discharged, and heavy metal pollution is becoming more and more serious. How to effectively treat and recycle it has become a common concer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
CPCC02F1/286C02F3/12C02F3/32C02F9/00
Inventor 曾伟民石丽娟喻子凌陈桢陈雷李振桦余润兰李交昆申丽刘元东吴学玲
Owner CENT SOUTH UNIV
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