Method for removing heavy metal in solid organic waste compost

A technology of organic waste and heavy metals, applied in the direction of organic fertilizers, climate change adaptation, etc., can solve the problems of compost manufacturers' difficulties, shrinkage, and threats to the survival of enterprises.

Active Publication Date: 2010-01-13
安徽徽粮生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the main problem in the production of waste composting is that composting products contain excessive harmful substances (mainly heavy metals), which greatly affects the scope of use of the product (for example, it cannot be used in farmland), and also limits the price of the product. Users are prone to psychological problems. Contradictions have caused great difficulties for compost manufacturers and threatened the survival of enterprises, and caused the stagnation or even shrinkage of the entire industry
This issue is gradually attracting attention, and limited research has focused on changing t

Method used

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  • Method for removing heavy metal in solid organic waste compost

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Comparison scheme
Effect test

Embodiment 1

[0019] Such as figure 1 As shown, the present embodiment adopts the agricultural solid waste compost product 2, and takes 10 kg of the compost product, and its heavy metals are artificially added. After the addition is completed, it is placed on the laboratory pile bed 1. The upper end of the pile bed 1 is provided with a leaching pipe 4 and an exhaust device 3. The bottom part of the pile bed is provided with a filtrate tank 8 and a filter screen 7. The two ends of the filtrate tank 8 are An inlet pipe 9 and a liquid discharge pipe 6 are arranged respectively, and an agitator 5 is arranged in the bed.

[0020] Carry out biological leaching according to the steps stated in the technical scheme of the present invention, through 7d leaching, the removal rates of Zn and Cu are respectively 95% and 89%, which greatly reduces the concentration of heavy metals in the compost product, and the concentration of N and P The loss (in terms of total nitrogen and total phosphorus) <5%, ha...

Embodiment 2

[0022] This embodiment adopts agricultural solid waste composting products, and takes 10kg of composting products, and its heavy metals are artificially added. g / kg of finished compost. After adding heavy metals, the compost product is placed on the laboratory heap bed, and bioleaching is carried out according to the steps of the technical scheme of the present invention. After 14 days of leaching, the removal rates of Cr, Cd, and Pb are respectively 97%, 98%, and 95%. The effect is good, the concentration of heavy metals reaches the standard, and the loss of N and P is less than 10%, which has a slight impact on the fertilizer efficiency of the product. However, after the heavy metal content is greatly reduced, the application range of this compost product can be greatly expanded, and it is still of great importance for improving product quality. significance.

Embodiment 3

[0024] This embodiment adopts urban organic waste composting products, and takes 10kg of composting products, and its heavy metals are contained by itself. After preliminary testing, the types of heavy metals are Zn, Cu, Cr, Cd and Pb, and their contents are respectively 1, 0.8, 0.55, 0.1 , 0.03g / kg compost finished product, this compost product is placed on the heap bed, carries out biological leaching operation according to the technical scheme of the present invention, and each stage removal rate is as shown in the table below:

[0025] Table 1 List of heavy metal removal rates in each time period

[0026] Zn

Cu

Cr

CD

Pb

7d

85

80

43

47

37

14d

97

95

91

92

87

[0027] As shown in Table 1, after 7 days of leaching, various heavy metals have a certain removal rate, and the removal rates of Zn and Cu are significantly higher than the other three heavy metals. The res...

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Abstract

The invention relates to a method for removing heavy metal in solid organic waste compost, which comprises the following steps: (1) adding sulfur powder into solid organic waste compost according to a use amount of 10-150 g of sulfur powder for one 1kg of compost; (2) adding ferrous sulfate heptahydrate solution into the compost; (3) inoculating microorganism compound bacteria including thiobacillus ferrous oxide, thiobacillus thiooxidans, white rot fungi, yeast and penicillium according to a use amount of 1g of compound bacteria for 1 kg of compost; (4) spraying and leaching the inoculated compost which is arranged on a stacking bed and keeping water content in the stacking bed to be not lower than 65 percent; (5) during leaching time of 4-14 days, monitoring the concentration of heavy metal of leaching liquid in real time till the concentration of heavy metal meets the national standard; and (6) adding slaked lime into the compost to adjust pH value to 7 after the leaching is finished. The invention has the advantages that the removal rate of heavy metal in leaching reaches over 90 percent, the lose rate of nutrient elements such as N, P and the like is lower than 5 percent, and the method has simple operation and low running cost.

Description

technical field [0001] The invention relates to a method for removing heavy metals in solid composting products, in particular to a method for removing heavy metals in urban waste composting by adopting biological leaching technology. Background technique [0002] With the improvement of national material and cultural living standards, the output and composition of urban waste are rapidly increasing and changing. At present, my country produces 114 million tons of garbage every year. Urban garbage causes water, soil, and air pollution and the spread of diseases. It has become a social problem that pollutes the environment and plagues human beings. One of the solutions is to make garbage composting. It is a comprehensive resource utilization technology with small investment, low operating cost and high economic benefits. It is a treatment technology that has been widely valued at home and abroad. The potential economic value of the solid waste is in line with my country's sol...

Claims

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Application Information

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IPC IPC(8): C05F9/04A62D3/02A62D101/43
CPCY02A40/20
Inventor 伍永钢王德生张从军
Owner 安徽徽粮生物科技有限公司
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