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Leaching repair system for heavy metal contaminated soil

A technology for polluted soil and remediation system, applied in heavy metal contaminated soil leaching and remediation system, heavy metal contaminated soil leaching and remediation field, can solve the problems of strong toxicity, long remediation period, easy to be absorbed by organisms, etc., to achieve strong removal ability and energy saving High efficiency and good biodegradability

Active Publication Date: 2016-08-24
HUAZHONG AGRI UNIV
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Problems solved by technology

Compared with heavy metal pollution in the atmosphere and water, heavy metal pollution in soil has the characteristics of concealment, accumulation, hysteresis, long repair period, strong toxicity and easy biological absorption.

Method used

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  • Leaching repair system for heavy metal contaminated soil

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Embodiment Construction

[0024] The technical solutions of the present invention will be further specifically described below through the embodiments and in conjunction with the accompanying drawings.

[0025] like figure 1 As shown, the heavy metal contaminated soil leaching repair system includes a rotary drum heavy metal leaching reactor 26, and also includes an agricultural and forestry waste hydrolysis acidification tank 5, and the agricultural and forestry waste hydrolysis acidification tank 5 is connected to the inlet of the first water pump 8, and the first water pump The outlet of 8 is connected to the liquid inlet of the rotary drum heavy metal rinsing reactor 26 through the second flowmeter 14, and the rotary drum heavy metal leaching reactor 26 includes a rinsing product outlet 25 and a polluted soil inlet 15, and the leaching product outlet 25 is below A mud-water mixing tank 27 is provided, and the mud-water mixing tank 27 is connected with the input end of the decanter centrifuge 41 thr...

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Abstract

The invention discloses a leaching repair system for heavy metal contaminated soil. A forestry and agricultural waste hydrolytic acidification tank is connected to a rotary cylinder heavy metal leaching reactor, a mud and water mixing pool is arranged below a leaching product outlet of the rotary cylinder heavy metal leaching reactor, the mud and water mixing pool is connected to a horizontal spiral centrifuge, a liquid outlet of the horizontal spiral centrifuge is connected to a submerged evaporator, the forestry and agricultural waste hydrolytic acidification tank is also connected to an acidizing fluid anaerobic reaction tank, a biogas outlet on the top of the acidizing fluid anaerobic reaction tank is connected to a fuel gas inlet of a hot blast heater, and an air outlet end of the hot blast heater extends to the inner bottom end of the submerged evaporator through an air duct. According to the system disclosed by the invention, organic acid liquor generated by anaerobic fermentation of forestry and agricultural wastes such as kitchen wastes and crop straws is taken as a leaching agent for repairing the heavy metal contaminated soil, has relatively strong scavenging activity to heavy metals, and is good in biodegradability and can improve the soil structure. Furthermore, nutrients such as organic matters, total nitrogen, total phosphorus and effective phosphorus are improved to different extents.

Description

technical field [0001] The invention relates to the technical field of soil heavy metal pollution treatment, in particular to a heavy metal-contaminated soil leaching repair system, which is suitable for heavy metal-contaminated soil leaching and repairing. Background technique [0002] Soil is a natural body composed of various minerals and is a central element in regulating the environment. With the rapid growth of population and the rapid development of industry, a large amount of pollutants are produced, which leads to the soil environment being polluted to varying degrees. [0003] It is estimated that the currently polluted arable land area in China is nearly 20 million hm 2 , accounting for about 1 / 5 of the total area of ​​arable land, of which industrial "three wastes" pollute 10 million hm 2 , the area of ​​farmland sewage irrigation has reached more than 1.3 million hm 2 . Every year, 10 million tons of grain production is reduced due to soil pollution, and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/02
CPCB09C1/02
Inventor 谭中欣刘利云
Owner HUAZHONG AGRI UNIV
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