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Dual-circulation two-grade anaerobic digestion system and application thereof

An anaerobic digestion system and anaerobic digestion technology, applied in the field of dual-cycle two-stage anaerobic digestion system, can solve the problems of poor sludge degradation, low gas production, low methane production, etc., and achieve high organic load and removal of organic matter. efficiency, biogas production and high productivity, and the effect of improving operational 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

However, at present, the gas production of sludge anaerobic digestion in my country is small and the gas production is unstable, so it is difficult to apply anaerobic stabilization process to treat it.
[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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  • Dual-circulation two-grade anaerobic digestion system and application thereof
  • Dual-circulation two-grade anaerobic digestion system and application thereof
  • Dual-circulation two-grade anaerobic digestion system and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Take dewatered sludge (water content 77.82%) and thickened sludge (water content 95.44%) from a sewage treatment plant in a certain place to make mixed sludge with water content 88.0% in the sludge blending tank. At this time, its volatile Organic solids accounted for 33.4% of the total solids.

[0066] Such as figure 1 As shown, 2.5 L is pumped into the first-stage anaerobic digestion reactor 3 from the sludge blending tank 6 through the first feed port 31 by the sludge pump every day, wherein the total effective volume of the first-stage anaerobic digestion reactor 3 is 10L, discharge 500mL from the second outlet 33 every day to the heating pretreatment device 1 (reflux ratio is 5%), heat at 120 degrees for 10min, and then circulate through the second inlet 34 into the primary anaerobic digestion reaction device 3. Simultaneously in the secondary anaerobic digestion reactor 5, discharge 5L every day by the first discharge port 32; The 2.5 L feed is circulated back ...

Embodiment 2

[0068] Take dewatered sludge (water content 82.11%) and thickened sludge (water content 96.23%) from a sewage treatment plant in a certain place to make mixed sludge with water content 92.0% in the sludge blending tank. At this time, its volatile Organic solids accounted for 45.2% of the total solids.

[0069] Such as figure 1 As shown, 2.0 L is pumped into the first-stage anaerobic digestion reactor 3 from the sludge adjustment tank 6 through the first feed port 31 every day to the primary anaerobic digestion reactor 3, wherein the total effective volume of the primary anaerobic digestion reactor 3 is 6L, 700mL is discharged from the second outlet 33 every day to the heating pretreatment device (reflux ratio 12%), heated at 100 degrees for 30min, and then circulated into the primary anaerobic digestion reactor 3 through the second inlet 34 middle. Simultaneously, discharge 4L every day from the first outlet 32 ​​to the secondary anaerobic digestion reactor 5; Circulate bac...

Embodiment 3

[0071] Take dewatered sludge (water content 79.23%) and thickened sludge (water content 99.12%) from a sewage treatment plant in a certain place to make mixed sludge with water content 98.0% in the sludge blending tank. At this time, its volatile Organic solids accounted for 60.2% of the total solids.

[0072] Such as figure 1 As shown, 2.0 L is pumped into the first-stage anaerobic digestion reactor 3 from the sludge adjustment tank 6 through the first feed port 31 every day to the primary anaerobic digestion reactor 3, wherein the total effective volume of the primary anaerobic digestion reactor 3 is 10.0L, discharge 2L per day from the second discharge port 33 into the pretreatment device (reflux ratio is 20%), heat at 90 degrees for 60 minutes, and then circulate through the second feed port 34 into the primary anaerobic digestion In reactor 3. Simultaneously, discharge 4L every day from the first outlet 32 ​​to the secondary anaerobic digestion reactor 5; Circulate bac...

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Abstract

The invention belongs to the field of sludge resource treatment and relates to a dual-circulation two-grade anaerobic digestion system and application thereof. The anaerobic digestion system comprises a pre-treatment device (1), a first circulating system (2), a primary anaerobic digestion reactor (3), a second circulating system (4), a secondary anaerobic digestion reactor (5), a sludge mixing and preparing pool (6), a methane tank (7) and a sludge collecting pool (8), wherein the first circulating system (2) is arranged between the pre-treatment device (1) and the primary anaerobic digestion reactor (3); and the second circulating system (4) is arranged between the primary anaerobic digestion reactor (3) and the secondary anaerobic digestion reactor (5). The system provided by the invention is high in treatment efficiency, compact in structure, mutually matched in operation, stable in operation and suitable for being popularized and applied in large, medium and small sewage treatment plants.

Description

technical field [0001] The invention belongs to the field of sludge resource treatment, and relates to a double-cycle two-stage 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 t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
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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