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Method for recycling and processing organic sludge as resources

A technology for organic sludge recycling and treatment, applied in sludge treatment, biological sludge treatment, dehydration/drying/concentrated sludge treatment, etc., to achieve the effect of eliminating sludge odor, low aeration, and killing pathogenic bacteria

Active Publication Date: 2012-07-18
JIANGSU UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a recycling method for recycling organic sludge aiming at the defects of the sludge treatment process in the prior art

Method used

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  • Method for recycling and processing organic sludge as resources
  • Method for recycling and processing organic sludge as resources
  • Method for recycling and processing organic sludge as resources

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The recycling and treatment method of organic sludge in this embodiment deals with sludge in spring and autumn.

[0047] See figure 1 The organic sludge treatment system of this embodiment includes a reactor 1, a thickening device 2, a heat exchanger 3, a mechanical dehydration device 4, a sludge conveying device 5, a membrane treatment device 6, a mud pump 71, a circulating water pump 72, a first The sludge return pump 73, the second sludge return pump 74, and corresponding valves and pipelines, wherein the thickening device 2 used is a thickening tank.

[0048] The reactor 1 is closed, and the reactor 1 is divided into a first reaction zone 11 and a second reaction zone 12, separated by a partition 13 between the two reaction zones, and the height of the partition 13 is lower than the height of the four walls of the reactor. Height, and the volume of the second reaction zone 12 is 4 times of the volume of the first reaction zone 11; the periphery of the reactor 1 is ...

Embodiment 2

[0067] What this embodiment deals with is the sludge in summer, and the COD of the wastewater discharged into the sewage plant in summer is lower than that in other seasons, resulting in less sludge. The difference between the processing system used and the processing system of embodiment 1 is that the concentrator 2 used is a centrifugal dehydration device, and the method adopted is basically the same as that of embodiment 1, except that:

[0068] In step ①, the solid content of the concentrated sludge is 7%, the fresh sludge VSS / TSS (volatile suspended solids / total suspended solids) = 58% to 62%, and the VSS concentration is 35g / L to 37g / L.

[0069] In step ③, the entire organic sludge treatment system is in the normal operation stage, and the first discharge of sludge in the second reaction zone 12 discharges 5 / 48 of the total volume of the second reaction zone. The sludge, that is, the total amount of sludge in the reactor 1 After the sludge is discharged, turn on the deli...

Embodiment 3

[0073] What this embodiment handles is the sludge in winter, and the difference between the processing system used and the processing system of embodiment 1 is that the thickening device 2 used is a centrifugal dehydration device, and the method adopted is basically the same as that of embodiment 1. The difference is:

[0074] In step ①, the solid content of the concentrated sludge is 6% to 7%, the fresh sludge VSS / TSS (volatile suspended solids / total suspended solids) = 65% to 75%, and the VSS concentration is 37g / L to 40g / L.

[0075] In step ②, the two reaction zones are filled and aerated, and continuously mixed evenly. Under the action of microorganisms and stirring, the temperature in the reactor 1 continues to rise, and the temperature in the reactor 1 rises to 45°C on the fifth day , no longer rise on the sixth day, open the vent pipe 11-2 of the first reaction zone and the valve at the vent pipe 12-2 of the second reaction zone, under the effect of gravity, both reac...

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Abstract

The invention discloses a method for recycling and processing organic sludge as resources. After the solid content reaches the sludge entering standard by concentrating the sludge, the sludge enters a reactor; the organic sludge carries out the start of thermal digestion in the reactor first, and after the start is finished, the temperature of the sludge in the reactor automatically rises to 48-52 DEG C; after the start stage is finished, the sludge is in the operating stage of the thermal digestion, wherein the sludge is acidulated at high temperature by oxygen hydrolysis in a first reactionzone and is aerobically digested at high temperature in a second reaction zone; and after the temperature of the digested sludge discharged by the second reaction zone in the operating stage is lowered by a heat exchanger, the digested sludge is conveyed into a mechanical dehydrator for mechanical dehydration, and then, the sludge is manufactured into sludge cakes to be conveyed outside. The sludge can be processed by the method to be stabilized and harmless, and a large amount of nutrients, such as nitrogen, phosphorus, potassium and the like in the sludge are reserved, thus the sludge can be used as fertilizer or soil improving additives for safe agricultural use to achieve the purpose of using the sludge as resources.

Description

technical field [0001] The invention relates to a sludge treatment method, in particular to a treatment method for resource recycling of organic sludge. Background technique [0002] In the process of urban sewage treatment, a large amount of sludge will inevitably be produced. Sludge usually refers to floc mainly composed of various microorganisms and organic and inorganic particles. When the sludge is mainly composed of organic matter, it is called organic sludge. In 1995, the World Water Environment Organization changed the name of sludge to "biosolids" in order to accurately reflect that the vast majority of sewage sludge has reuse value. pollutants". [0003] At present, there are three main methods of sludge treatment: comprehensive utilization, landfill and incineration. If the method of landfill is adopted, on the one hand, it will occupy a large amount of valuable land resources, and it will cause mountains of garbage, which will pollute the surrounding environme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/02C02F11/12C05F7/00
CPCY02A40/20Y02P20/129Y02W10/20
Inventor 程洁红周全法尚通明朱南文朱炳龙张锁荣
Owner JIANGSU UNIV OF TECH