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External circulation two-stage sludge anaerobic digestion system and application thereof

An anaerobic digestion system and anaerobic digestion technology, applied in the field of sludge resource treatment, can solve the problems that the anaerobic digestion process has not received attention, limit the advantages of anaerobic digestion technology, and the degree of sludge degradation is poor, and achieve a compact structure , high organic load and organic matter removal rate, and the effect of improving operation stability

Inactive Publication Date: 2012-07-18
盐城同济环科固体废物处理处置有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditional anaerobic digestion has the disadvantages of slow reaction, long sludge residence time (30-40 days), large tank volume, low methane production and poor sludge degradation degree, which limit the advantages of anaerobic digestion technology.
In recent years, domestic and foreign scholars have mostly considered how to strengthen the pretreatment method in the research on improving the recovery of biomass by anaerobic digestion of sludge, but the improvement of anaerobic digestion process has not received much attention.

Method used

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  • External circulation two-stage sludge anaerobic digestion system and application thereof
  • External circulation two-stage sludge anaerobic digestion system and application thereof
  • External circulation two-stage sludge anaerobic digestion system and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Take dewatered sludge (water content 77.82%) and thickened sludge (water content 95.44%) from a sewage treatment plant in a certain place and make mixed sludge with water content 88.0% in the sludge blending tank 6. At this time, its volatilization Sexual organic solids accounted for 33.4% of the total solids.

[0062] Such as figure 1 As shown, 2.5 L is pumped from the sludge blending tank 6 through the first feed port 11 to the first-level high-temperature anaerobic digestion reactor 1 by the sludge pump every day, wherein the first-level high-temperature anaerobic digestion reactor 1 is total The effective volume is 10L;

[0063] And discharge 500mL through the pretreatment feed inlet 71 every day to the heating pretreatment device 7 (reflux ratio is 5%), heat at 120 degrees for 10min, and then circulate through the pretreatment outlet 72 and put it into the first-level high-temperature anaerobic digestion reaction device 1;

[0064] At the same time, 2.5L is disc...

Embodiment 2

[0067] Take the dewatered sludge (water content 82.11%) and thickened sludge (water content 96.23%) from a sewage treatment plant in a certain place and make mixed sludge with a water content 92.0% in the sludge blending tank 6. At this time, its volatilization Sexual organic solids accounted for 45.2% of the total solids.

[0068] Such as figure 1 As shown, 2.0L is pumped from the sludge blending tank 6 through the first feed port 11 to the first-level high-temperature anaerobic digestion reactor 1 every day by the sludge pump, wherein the first-level high-temperature anaerobic digestion reactor 1 is total The effective volume is 6L;

[0069] And discharge 700mL through the pretreatment feed inlet 71 every day to the heating pretreatment device 7 (reflux ratio is 12%), heat at 100 degrees for 30min, and then circulate through the pretreatment outlet 72 and put it into the first-level high-temperature anaerobic digestion reaction device 1;

[0070] Simultaneously every day ...

Embodiment 3

[0073] Take the dewatered sludge (water content 79.23%) and thickened sludge (water content 99.12%) from a sewage treatment plant in a certain place and make mixed sludge with a water content 98.0% in the sludge blending tank 6. At this time, its volatilization Sexual organic solids accounted for 60.2% of the total solids.

[0074] Such as figure 1 As shown, 2.0L is pumped from the sludge blending tank 6 through the first feed port 11 to the first-level high-temperature anaerobic digestion reactor 1 every day by the sludge pump, wherein the first-level high-temperature anaerobic digestion reactor 1 is total The effective volume is 10.0L;

[0075] And every day through the pretreatment feed inlet 71 discharge 2L to the heating pretreatment device 7 (reflux ratio is 20%), after heating at 90 degrees for 60min, then circulate through the pretreatment outlet 72 and put it into the first-level high-temperature anaerobic In digestion reactor 1;

[0076] At the same time, 4L is di...

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Abstract

The invention belongs to the field of recycling treatment of sludge and relates to an external circulation two-stage sludge anaerobic digestion system and an application thereof. The system comprises a primary high-temperature anaerobic digestion reactor (1), a circulating reflux system (2), a secondary medium-temperature anaerobic digestion reactor (3), a methane pool (4), a sludge collecting pool (5), a sludge mixing pool (6) and a pretreatment device (7), wherein the circulating reflux system (2) is arranged between the pretreatment device (7) and the primary high-temperature anaerobic digestion reactor (1). The system organically combines the technologies of performing two-stage anaerobic digestion, hydrolyzing organic matters at a high temperature, performing circulating reflux and the like, combines a physical enhanced treatment technology with a microbiological treatment technology, really realizes high-efficiency utilization of organic substrates, can exert highest activity of bacteria in two sections, and improves the operational stability of the whole system.

Description

technical field [0001] The invention belongs to the field of sludge resource treatment, and relates to an anaerobic digestion system and its application. Background technique [0002] my country has built a large number of sewage treatment plants. As of 2009, 1,792 urban sewage treatment plants have been built nationwide, with a treatment capacity of 99.04 million m 3 / d, the average operating load rate is 81.27%. While the construction and operation of these sewage treatment plants have played an important role in the reduction of urban pollution load, the amount of urban sludge, a by-product of the sewage treatment process, is also increasing day by day. At present, the annual production of wet sludge in the country is nearly 30 million tons (water content 80%), and the center of sludge treatment and disposal has shifted from simple landfill to resource-based land use. Before the sludge is used for land use, it is necessary to stabilize the sludge to recover a large amou...

Claims

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Application Information

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IPC IPC(8): C02F11/04
CPCY02E50/343Y02E50/30
Inventor 严媛媛陈汉龙冯雷雨井永萍王朋
Owner 盐城同济环科固体废物处理处置有限公司
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