Method for solidifying and cementing tannery sludge containing heavy metals by bacillus pasteurii

A technology of Bacillus pasteurianus and tannery sludge, which is applied in the direction of fixed/solidified sludge treatment, chemical instruments and methods, sludge treatment, etc., to achieve the effects of low treatment cost, wide application range and low leaching amount

Active Publication Date: 2018-10-19
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the reported process of using urease-producing bacteria to treat heavy metals is mainly microbial solidification of heavy metals in the soil, but the use of urease-producing bacteria to solidify and cement tannery sludge containing various heavy metals has not been reported.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Carry out enrichment culture to Bacillus pasteurianus

[0029] Inoculate the Bacillus Pasteurella into the nutrient broth medium, cultivate overnight (12h) in a shaker at 130rpm at a temperature of 30°C to obtain a bacterial solution, and adjust the OD of the bacterial solution by diluting it with deionized water 600 is 1.0;

[0030] The formula of nutrient broth medium is: 1L deionized water, 10g peptone, 1.5g yeast extract powder, 1.5g beef extract and 5g sodium chloride.

[0031] (2) Solidify tannery sludge with Bacillus pasteurianus

[0032] Get 500mL step (1) to dilute the gained bacterial solution, add 10g urea, 1.388g (12.5mmol) calcium chloride, obtain the bacterial solution containing 2% urea and 25mM calcium chloride, then add 50ml of the bacterial solution to 50g leather Carry out sludge solidification treatment in the sludge, solidify at 25°C for 12 days, and add 10ml of nutrient broth medium containing 2% urea and 25mM calcium chloride to the tannery ...

Embodiment 2

[0035] The operating steps are the same as in Example 1. The difference is that step (2) tannery sludge is mixed with 5%, 15%, and 30% of fly ash with different concentration gradients, and the results are as follows:

[0036] After the tannery sludge mixed with 5% fly ash was solidified, the solidified body was subjected to pure water leaching experiments of heavy metals Ni, Cr and Pb, and the results showed that the removal rates of Ni, Cr and Pb were 96.1% and 94.2% respectively , 96.5%.

[0037] After the tannery sludge mixed with 15% fly ash was solidified, the solidified body was subjected to pure water leaching experiments of heavy metals Ni, Cr and Pb, and the results showed that the removal rates of Ni, Cr and Pb were 97.5% and 96.8% respectively , 97.5%.

[0038] After the tannery sludge mixed with 30% fly ash was solidified, the solidified body was subjected to pure water leaching experiments of heavy metals Ni, Cr and Pb, and the results showed that the removal r...

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PUM

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Abstract

The invention provides a method for solidifying and cementing tannery sludge containing heavy metals by bacillus pasteurii. The method comprises the following steps: mixing a bacteria solution of thebacillus pasteurii with tannery sludge to be treated under an aerobic condition, adding urea and calcium chloride into the bacteria solution, and solidifying at 20 to 30 DEG C for 12 to 15 days to finish solidification treatment of the tannery sludge containing heavy metals; generating calcium carbonate precipitate in the presence of the urea and calcium chloride by urease-producing bacteria to fix and cement the heavy metals in the tannery sludge and achieve harmless treatment of industrial waste residue. The method provided by the invention has the advantages of simple process, convenience in operation, obvious effect, low treatment cost, wide application range, freeness from secondary pollution and the like. Through the method provided by the invention, solidification and cementation ofthe tannery sludge containing heavy metals are realized, obtained solidified heavy metals have small leaching amount and high compressive strength, and can be taken as a building material.

Description

(1) Technical field [0001] The invention relates to a method for solidifying and cementing tannery sludge containing heavy metals by using Bacillus pasteurianus, and belongs to the technical field of environmental protection solid waste treatment. (2) Background technology [0002] With the rapid development of the current economy, my country has become a major leather manufacturing and exporting country in the world, and the rapid development of the leather industry has also caused serious environmental pollution. The tanning industry produces about 50 million tons of tanning sludge every year, which contains various heavy metals (chromium, cadmium, nickel, etc.) and organic pollutants. At present, the final disposal methods of tannery sludge mainly include landfill, incineration, on-site stacking, or use as building materials and composting, which will cause serious secondary pollution. [0003] Chromium is the main heavy metal component in tannery sludge, which is seriou...

Claims

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Application Information

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IPC IPC(8): C02F11/02C02F11/00C02F101/20C02F103/24
CPCC02F11/008C02F11/02C02F2101/20C02F2103/24
Inventor 潘响亮张世杰祝鹏烽赵瑶瑶李玉
Owner ZHEJIANG UNIV OF TECH
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