Method for efficiently purifying municipal sludge heavy metals

A technology for municipal sludge and heavy metals, applied in the direction of biological sludge treatment, etc., can solve the problems of cumbersomeness, difficulty in the industrialization of sludge heavy metal removal, complex copying of equipment, etc., to reduce workload and cost, and facilitate calculation of dosage and operation easy effect

Active Publication Date: 2014-06-25
XIAMEN TASMAN BIO TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

But this set of continuous flow reactor method equipment is complex and cumbersome
[0007] Due to the great differences in the types, contents, and initial pH values ​​of heavy metals exceeding the standard in different sewage plants in different regions, it has brought great difficulties to the removal of heavy metals in sludge, especially for industrialization.

Method used

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  • Method for efficiently purifying municipal sludge heavy metals
  • Method for efficiently purifying municipal sludge heavy metals
  • Method for efficiently purifying municipal sludge heavy metals

Examples

Experimental program
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Embodiment

[0029] 1. Method selection research:

[0030] a) Substrate type and concentration selection experiment: Using the raw sludge of Xiamen Yuandang Sewage Plant as the material, set up Thiobacillus thiooxidans substrate elemental sulfur (5, 10, 20g / L), sodium thiosulfate (10, 20, 40g / L) and Thiobacillus ferrooxidan substrate FeSO4.7H 2 O (10, 20, 40g / L) totaled 9 treatments, carried out heavy metal leaching culture (room temperature 25°C, rotation speed 200r / min), and measured the concentrations of common heavy metals Zn and Cu in the filtrate after 6 days.

[0031] b) Selection experiment of the number of cultures and dosage of bacteria: the more cultures of Thiobacillus oxidans, the higher the concentration. The experiment adopts three cultures and one culture, and the concentrations are 0, 2%, 5%, 10%, 15% %Five grades, ten treatments in total; with 10g / L S as the substrate, heavy metal leaching culture was carried out at room temperature 25°C and rotation speed 200r / min, and ...

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Abstract

The invention discloses a method for efficiently purifying municipal sludge heavy metals. The method comprises the following steps: 1, adding a substrate which is 10-20g / L S to a material raw sludge, carrying out enrichment culturing of sulfur oxide bacilli, adding the obtained sulfur oxide bacilli which are treated as strains to a culturing solution treating the raw sludge as a raw material and the 10-20g / L S as a substrate, carrying out secondary enrichment culturing of the sulfur oxide bacilli, and carrying out enrichment culturing at least three times to make the bacterial solution become a high-concentration sulfur oxide bacillus inoculation solution; and 2, adjusting the concentration of sludge for processing to 1-5%, inoculating by using the sulfur oxide bacillus inoculation solution obtained after at least three-time culturing, adding 10-20g / L S as a substrate, adjusting the pH value to 4, and carrying out leaching culturing at 25-32DEG C for 2-5 days, wherein the inoculation amount is 10-15% of the volume of the sludge for processing. The method allows all standard-exceeding heavy metals to be removed within 4 days to make a fertilizer reach an agricultural standard when the contents of the standard-exceeding heavy metals in sludge are in a range 5.0 times the agricultural standard.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a method for efficiently purifying heavy metals from urban sludge. Background technique [0002] With the acceleration of urbanization and the improvement of sewage treatment rate, the output of municipal sludge is increasing day by day. The sludge production in Xiamen alone in 2007 reached 9.5*10 4 m 3 (moisture content 76%). Most municipal sludge is rich in organic matter and nutrients such as N, P, and K. Farmland reuse is the main way and the best choice for sludge resource utilization, but its heavy metal content has become the biggest obstacle to its application to soil. [0003] Bioleaching is an economical, effective and highly potential method with low operating cost and strong practicability among several existing technologies for removing heavy metals from urban sludge (chemical method, electrochemical method, phytoremediation method, and supercritical fluid ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/02
Inventor 陈丽璇陈菲蔡晓东陈淳
Owner XIAMEN TASMAN BIO TECH
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