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New method for deeply dewatering sludge through bio-leaching process rapid conditioning

A technology of biological leaching and deep dehydration, applied in the field of environmental treatment, can solve the problems of long reaction time and poor dehydration effect, and achieve the effects of easy evaporation, simple process and low operating cost.

Active Publication Date: 2014-07-23
NANJING AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a new method for fast bioleaching deep dehydration in view of the shortcomings of the existing sludge bioleaching deep dehydration method, such as long reaction time and poor dehydration effect in spring and winter

Method used

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  • New method for deeply dewatering sludge through bio-leaching process rapid conditioning

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1 Enrichment, domestication and inoculum preparation of composite microbial flora

[0034] The strains used for sludge bioleaching are thiobacillus thioooxidans TS6, thiobacillus ferrooxidans LX5, Pichia pastoris P.spartinae D13, Geotrichum Galactomyces sp.Z3, and Rhodotorula mucilaginosaR30. Put the above-mentioned strains in their respective medium (Thiobacillus thiooxidans TS6 medium g / L: (NH 4 ) 2 SO 4 0.4, KH 2 PO 4 3.0, MgSO 4 ·7H 2 O0.5, CaCl 2 ·2H 2 O0.25, sulfur powder 10; Thiobacillus ferrooxidans LX5 medium g / L: (NH 4 ) 2 SO 4 3.5, KCl0.119, K 2 HPO 4 0.58, Ca(NO 3 ) 2 ·4H 2 O0.168, MgSO 4 ·7H 2 O0.583, FeSO 4 ·7H 2 O4.42, use 10N H 2 SO 4 Adjust the pH to 2.5; Pichia pastoris D13, red yeast R30 and geotrichum Z3 medium g / L: potato 200, sucrose or glucose 20, use 10N H 2 SO 4 Adjust the pH to 2.5) for culture expansion (placed in a reciprocating shaker at 28°C and shake culture at 180 rpm until the number of bacterial cells reaches 10 8 / ML), and then mix...

Embodiment 2

[0035] Example 2: Biological leaching conditioning of sludge from a municipal sewage treatment plant in Nanjing

[0036] According to the process mentioned in the present invention, according to the process (see attached figure 1 ) Treatment of sludge from a municipal sewage treatment plant in Nanjing. The sewage treatment process of the sewage treatment plant is the activated sludge method. The sludge has not been anaerobic or aerobic digested. Take about 10 tons of concentrated sludge with a solid content of 4.46%, and the basic properties of the liquid sludge are determined to be The pH value is 7.26, the organic matter is 52.9%, and the sludge specific resistance is 1.50×10 13 m kg -1 , It is extremely difficult to dehydrate, and has a foul smell.

[0037] Biological leaching stage: Add the inoculum and the sludge to be treated into the biological leaching reactor according to the volume ratio of the inoculum and the sludge to be treated at 1:9, and add the biological leachin...

Embodiment 3

[0039] Example 3: Biological leaching conditioning of sludge from a sewage treatment plant in Wuxi

[0040] According to the process mentioned in the present invention, according to the process (see attached figure 1 ) Treatment of sludge from a municipal sewage treatment plant in Wuxi. The sewage treatment process of the sewage treatment plant is the activated sludge method. The sludge has not been treated by anaerobic or aerobic digestion. About 10 tons of concentrated sludge from the plant was taken, and the basic property of the liquid sludge was determined to be 7.52. Organic matter is 48.3%, total nitrogen is 4.78%, total phosphorus is 3.00%, high calorific value is 10.4MJ / kg, heavy metals are not exceeded, and the specific resistance of sludge is 2.05×10 13 m kg -1 , It is extremely difficult to dehydrate, and has a foul smell. Before conditioning, the sludge was diluted to a solid content of 2%, 3%, 4% and 5%, and the specific resistance of the sludge was determined to ...

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Abstract

The invention discloses a new method for deeply dewatering sludge through bio-leaching process rapid conditioning. The method comprises the steps of firstly performing bio-leaching conditioning on sludge, namely, directly pumping concentrated liquid sludge of a sewage treatment plant into a bio-leaching reactor which contains special composite microbial community, performing treatment for 1.5-2 days, changing bound water in the sludge into free water which can be removed relatively easily by virtue of the microbial substitution effect, biological oxidation effect and biological acidification effect, dissolving out heavy metals from the sludge at the same time, entering an aqueous phase, killing pathogens in the sludge, then collecting the sludge subjected to bio-leaching in a homogeneous pool, directly transporting to a common-pressure diaphragm chamber type filter press by virtue of a pump, and dewatering, wherein the moisture content of dewatered sludge cake is less than 60%, and no flocculant like PAM (polyacrylamide) is added during the preparation process. The method disclosed by the invention is performed under normal temperature and pressure, and has low cost; the dewatered sludge cake is low in moisture content, odorless, and yellowish-brown in color; and the organic matters, calorific values and nutrients of the dewatered sludge can not be reduced, thus facilitating the subsequent resource utilization.

Description

Technical field [0001] The invention belongs to the field of environmental treatment, and relates to a new method for rapid conditioning of deep dehydration by sludge biological leaching. Background technique [0002] With the development of my country's economy, the acceleration of urbanization and the improvement of environmental quality requirements, my country's sewage treatment industry has developed rapidly in recent years. As of the end of September 2013, a total of 3,501 urban sewage treatment plants have been built in cities and counties nationwide, with a sewage treatment capacity of approximately 147 million cubic meters per day, and more than 100,000 tons of dewatered sludge per day. The moisture content of these sludges is still as high as about 80%. The environmental problems caused by high moisture content have attracted increasing attention. To properly handle such huge sludges, huge infrastructure investment and operating costs are required. The traditional slud...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/02C02F11/12
CPCY02W10/20
Inventor 周立祥
Owner NANJING AGRICULTURAL UNIVERSITY
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