A biological modification method for deep dehydration of sludge

A biological modification and deep dewatering technology, applied in water/sludge/sewage treatment, sludge treatment, sludge treatment, etc., can solve the problem of reducing the content of persistent organic pollutants and heavy metals in sludge, No degradation, low temperature operation limited sludge and other problems, to achieve the effect of short biological modification time, low cost and reducing toxic effects

Active Publication Date: 2019-03-01
长兴瑷晟环保科技有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a rapid biological modification method for deep dehydration of sludge to solve the problems of long processing time, limited low temperature operation and no degradation of persistent organic pollutants in sludge existing in existing sludge biological conditioning methods According to the method of the present invention, the biological conditioning time can be greatly shortened, the content of persistent organic pollutants and heavy metals in the sludge can be reduced, and the operating cost can be reduced. At the same time, the method can be applied to the treatment of anaerobic digested sludge

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  • A biological modification method for deep dehydration of sludge
  • A biological modification method for deep dehydration of sludge

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Embodiment 1

[0043] Example 1: Preparation of enrichment, domestication and inoculum of complex microbial flora

[0044] The microorganisms adopted in the method of the present invention are two kinds of composite microbial flora, which are respectively composite flora 1 and composite flora 2. Both of these two flora are micro-organisms that have been acclimatized at low temperature, and the acclimation temperature is 10-35°C, and they can reproduce and grow rapidly at 10-35°C.

[0045] Composite flora 1 includes Bacillus subtilis, Pseudomonas aeruginosa, white rot fungi and Alteromonas, and was purchased from the German Culture Collection. Above-mentioned bacterial strain is inoculated in respective culture medium, and the formula of the culture medium of Bacillus subtilis, Pseudomonas aeruginosa, white rot fungus and alteromonas is respectively as follows (g / L):

[0046] The culture medium of Bacillus subtilis is: 20g glucose, 15g peptone, 5g sodium chloride, 5g beef extract;

[0047] ...

Embodiment 2

[0056] The invention discloses a biological modification method for deep dehydration of sludge, which adopts the method of biological modification combined with plate and frame filter press to perform rapid deep dehydration treatment on sludge. The method adopts two kinds of composite microbial flora (composite flora 1 and composite flora 2), and adopts two-stage biomodification technology to carry out biological modification treatment to the sludge, and the described method comprises the following steps:

[0057] (1) Enrichment, domestication and preparation of inoculum of complex microbial flora

[0058] With embodiment 1.

[0059] (2) Biological modification of sludge

[0060] According to the 10%-30% of the fresh sludge volume ratio, add the described composite flora 1 sludge inoculum to the bio-modification reactor equipped with fresh sludge, and according to the 3%-8% of the sludge dry matter mass Add microbial modified nutrients at a ratio of %, and react for 3-5 hour...

Embodiment 3

[0069] Example 3 Biological modification of sludge from a sewage treatment plant in Nanjing

[0070] According to the process method mentioned in the present invention, according to figure 1 The process flow shown is for biomodification of sludge from an urban sewage treatment plant in Nanjing. The sewage treatment of the waterworks adopts the activated sludge method, and the sludge has not undergone anaerobic or aerobic treatment. About 10 tons of concentrated sludge containing 3% solids were taken, the organic matter content was determined to be 45%, and the pH value was 7.6. The enrichment, acclimation and inoculum preparation of the complex microbial flora are the same as in Example 1, but in this example the acclimatization temperature is 30°C.

[0071] Biomodification stage:

[0072] Add the complex flora 1 sludge inoculum to the bio-modification reactor equipped with fresh sludge according to 10% of the fresh sludge volume ratio, and add microbial modified nutrients ...

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Abstract

The invention discloses a biological modification method for sludge deep dewatering. The method for conducting plate-frame pressure filtration after biological modification is adopted for deep dewatering treatment of sludge. According to the method, two composite microbial floras are used for biological modification treatment of sludge stage by stage, liquid sludge concentrated in a sewage treatment plant is conveyed to a biological modification reactor containing the composite floras for continuous aeration reaction at 10-35 DEG C, the total stay time of the sludge in the two-segment reactor is 10-25 h, moisture in the sludge is released, lasting organic pollutants in the sludge are degraded, and meanwhile heavy metal in the sludge is released to a liquid phase; then, pressure filtration and dewatering are conducted on the sludge subjected to biological modification, and dewatering is conducted till the water content in sludge cakes is 60% or below under the condition that no flocculant is added. The method can be implemented at normal temperature and normal pressure, cost is low, biological modification time is short, the process is simple, and the method is low in cost and high in application value.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment, in particular to a biological modification method for deep dehydration of sludge. Background technique [0002] In recent years, my country's sewage treatment industry has developed rapidly. By the end of 2015, more than 3,800 urban sewage treatment plants had been built in cities and counties across the country, and the daily sewage treatment capacity reached 15,000m 3 , generating more than 100,000 tons of excess sludge (water content 80%) every day. The excess sludge is a heterogeneous body composed of fragments of organic matter, bacterial cells, inorganic particles, organic and inorganic colloidal particles, etc., which can absorb more than 85% of toxic and harmful substances in sewage. The cost of excess sludge treatment in traditional sewage treatment plants accounts for about 20-50% of the total operating costs of sewage treatment plants, and the investment cost of excess sludge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/02C02F11/122
CPCC02F11/02C02F11/122C02F2303/06Y02W10/20
Inventor 张雪英吴绪军
Owner 长兴瑷晟环保科技有限公司
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