Method for removing heavy metals in soil by taking kitchen waste organic acid fermentation liquors as repairing agents

A technology of food waste and fermentation liquid, which is applied in the field of soil remediation to achieve good biodegradability

Inactive Publication Date: 2016-12-21
上海环境工程技术有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to seek a low-cost soil heavy metal remediation agent and solve the resource problem of food waste fermentation liquid, the present invention aims to provide a method for remediating heavy metal pollution in soil by using food waste organic acid fermentation liquid

Method used

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  • Method for removing heavy metals in soil by taking kitchen waste organic acid fermentation liquors as repairing agents
  • Method for removing heavy metals in soil by taking kitchen waste organic acid fermentation liquors as repairing agents
  • Method for removing heavy metals in soil by taking kitchen waste organic acid fermentation liquors as repairing agents

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Embodiment 1

[0026] Take the kitchen waste squeezed from a school canteen in Shanghai, remove hard objects such as bones, plastic bags, chopsticks and other sundries, weigh 200g and mix it with tap water at a ratio of 1:1 by weight and grind it with an electric mixer to obtain food waste The slurry is poured into a 500mL serum bottle, and the serum bottle stopper is connected to the injection needle to form a micro-oxygen environment. Set up fermentation 1d, 2d, 3d, 4d, 5d, 7d, 9d, a total of 7 fermentation groups, and set 3 parallel samples in each group. The serum bottle was placed in a constant temperature incubator, and the temperature was controlled at 25°C. After reaching the fermentation time, the fermentation bottle was taken out to obtain 7 groups of fermentation liquids in total. During the fermentation period, the volatile organic acid (VFA) concentration of the fermentation broth was measured by gas chromatography GC, and the pH change of the fermentation broth was measured by...

Embodiment 2

[0029] Select the fermented liquid fermented for 5 days, mix it with the soil according to the solid-to-liquid ratio of 1:5, 1:10, 1:20, 1:50, and 1:100, and place the mixed solution in a BS-S air bath constant temperature oscillator to control The temperature is 25°C and the vibration is at a speed of 150r / min. The mixed solution was taken at regular intervals, and then digested with concentrated nitric acid / perchloric acid system for 2 hours, and the concentration of heavy metals was determined by ICP-OES. Such as image 3 As shown, the solid-liquid ratio of 1:20-1:50 can basically meet the requirements, and the removal rate of Cd, Cu, and Zn heavy metals can reach more than 70% within 6h-12h, and the removal rate of lead can also reach more than 20%. .

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Abstract

The invention discloses a method for removing heavy metals in soil by taking kitchen waste organic acid fermentation liquors as repairing agents. The method comprises the following steps of: (1) removing hard substances such as bones, and sundries such as plastic bags and chopsticks in kitchen wastes, then mixing the kitchen wastes with running water in a weight ratio of (1:1)-(1:3) and crushing the mixture with an electric blender to obtain kitchen waste slurry; (2) placing the obtained kitchen waste slurry in an anaerobic fermentation tank, culturing at the constant temperature of 15-35 DEG C for 5-10 days, then taking out, centrifuging at 3000-4000 r / min got 10-20 min, filtering a supernatant to obtain a fermentation liquor storing solution, placing the fermentation liquor storing solution in a refrigerator at 4 DEG C to be stored for later use; and (3) mixing and oscillating heavy metal contaminated soil and the fermentation liquor storing solution obtained in step (2) according to different solid-to-liquid ratios. The method has the beneficial effects that 1, the used fermentation liquors have complicated components, contain a large number of functional groups such as hydroxyl (-OH), carboxyl (-COOH), amino (-NH2) and the like and have a certain removal effects for most heavy metals; 2, the used heavy metal repairing agents are low in price, easy to obtain and suitable for mass production.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to a method for removing heavy metals in soil by using organic acid fermentation liquid of kitchen waste as a remediation agent Background technique [0002] With the acceleration of China's industrialization, the phenomenon of "poisonous land" caused by industrial emissions and factory relocation has become more and more prominent, which has aroused widespread concern from the state and society. At present, the remediation of heavy metal-contaminated soil mainly adopts physical chemical technology and phytoremediation technology. According to its action process and mechanism, physicochemical technology mainly includes chemical solidification, soil leaching and electrodynamic restoration, and phytoremediation technology includes plant stabilization, plant volatilization and plant extraction. The treatment cost of phytoremediation is low, but the treatment perio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 陈浩泉戴世金赵由才黄健高乐於君石
Owner 上海环境工程技术有限公司
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