Method for removing heavy metal Cd from river sediment

A technology for river sediment and heavy metals, applied in sludge treatment, biological sludge treatment, etc., can solve the problems of lack, harm to human health, large energy consumption, etc., and achieve simple process, low implementation cost and good treatment effect Effect

Inactive Publication Date: 2011-11-02
CHONGQING UNIV
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Problems solved by technology

The disadvantage of this technology is that soil organic matter and structural water are easily destroyed, and it takes a lot of energy to drive away soil moisture
This method has a certain effect, solidifying heavy metals in situ, greatly reducing the cost, but it also has certain limitations: it only changes the existing form of heavy metals in the soil, and it is not well understood about the long-term stability of the soil and its impact on the ecosystem. research in...

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  • Method for removing heavy metal Cd from river sediment
  • Method for removing heavy metal Cd from river sediment

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Embodiment Construction

[0019] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0020] The present invention is firstly the cultivation and acclimation of sulfur bacteria and the preparation of bioleaching inoculum, absorbing 10ml of strain samples from coal mine pit water and pit mud, adding 30ml 9k liquid culture medium, and starting to cultivate under the condition of 30°C, when the solution Turn into reddish brown, absorb 10ml of supernatant and add 90ml of 9k liquid medium, culture again under the same conditions, transfer like this 5 times, the time until reddish brown appears changes from original 5d to 1d, and domesticated ferrous oxide is obtained Sulfur bacteria inoculum (hereinafter referred to as inoculum).

[0021] 9K medium is composed of A component and B component, the pH value after mixing is 2.5, A component includes (NH 4 ) 2 SO 4 3.0g, KCl 0.1g, K 2 HPO 4 0.5g, MgSO 4 ·7H 2 O 0.5g, Ca...

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Abstract

Relating to a municipal solid waste disposal technology, the invention provides a method for removing heavy metal Cd from river sediment by microbial leaching, and the method of the invention aims to provide a solution to the problems of severe heavy metal Cd pollution in urban river sediment and utilization restriction of dredged sediment in agriculture and forestry. The method is realized by: adding a proper amount of cultured and acclimated inoculation liquid into a reaction system, and keeping a substrate at a concentration of 30g/L, the inoculation liquid in a volume ratio of 5%, the dissolved oxygen at a concentration of 7.5-9.0mg/L and the temperature in a range of 25-32DEG C, and regularly supplementing the moisture evaporated in a reactor. The method of the invention employs microbial leaching so as to make the removal rate of heavy metal Cd reach 16%-18%.

Description

technical field [0001] The invention relates to a method for treating heavy metals in river bottom mud, in particular to a technical method for removing heavy metal Cd in dredged bottom mud by biological leaching. [0002] Background technique [0003] River sediment (sediment) pollution is an important environmental problem in the world. Pollutants enter the water body through atmospheric deposition, wastewater discharge, rainwater leaching and scouring, and finally deposit in the bottom mud and gradually enrich, the bottom mud is gradually polluted, and finally the bottom mud becomes a pool of pollutants. After effectively controlling the external pollution sources of the river, when the water environment changes, the nitrogen and phosphorus nutrients, heavy metals and refractory organic matter deposited in the sediment will be re-released into the water body, affecting the water quality of the overlying water body. Form "secondary pollution". In addition, bottom mud is...

Claims

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Application Information

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IPC IPC(8): C02F11/02
CPCY02W10/20
Inventor 刘国涛彭绪亚李建华刘斌袁荣焕
Owner CHONGQING UNIV
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