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, killing pathogenic bacteria, and low aeration

Active Publication Date: 2010-04-28
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 organic sludge resource recycling treatment method of this embodiment processes 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 pipes, wherein the thickening device 2 used is a thickening tank.

[0048] The reactor 1 is closed. The reactor 1 is divided into a first reaction zone 11 and a second reaction zone 12. The two reaction zones are separated by a partition 13 whose height is lower than that of the four walls of the reactor. Height, and the volume of the second reaction zone 12 is 4 times the volume of the first reaction zone 11; the periphery of the reactor 1 is wrapped with insulation materials; the sludge in...

Embodiment 2

[0067] The sludge processed in this embodiment is summer sludge, and the waste water discharged into the sewage plant in summer has lower COD than other seasons, resulting in a small amount of sludge. The difference between the processing system used and the processing system of Example 1 is that the concentration device 2 used is a centrifugal dehydration device, and the method used is basically the same as that of Example 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 35 g / L to 37 g / L.

[0069] In step ③, the entire organic sludge treatment system is in the normal operation stage, and the second reaction zone 12 discharges 5 / 48 of the total volume of the second reaction zone for the first time, which is the total amount of sludge in the reactor 1. After the sludge is discharged, the transfer pump 53 is turned on to supplem...

Embodiment 3

[0073] This embodiment treats sludge in winter. The treatment system used is different from the treatment system of embodiment 1 in that the thickening device 2 used is a centrifugal dehydration device, and the method used is basically the same as that of embodiment 1. the difference lies in:

[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 with aeration and continuously mixed uniformly. Under the action of microorganisms and agitation, the temperature in the reactor 1 rises continuously, and the temperature in the reactor 1 rises to 45°C on the 5th day , No more rise on the sixth day, open the valve at the vent pipe 11-2 in the first reaction zone and the vent pipe 12-2 in the second reaction zone. Under the action of gravity, both reaction zones discharge 2 / 3 or...

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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 reaction zone 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 recycling organic sludge. Background technique [0002] In the process of urban sewage treatment, a large amount of sludge is inevitably produced. Sludge usually refers to flocs 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, in order to accurately reflect that most sewage sludge has the value of reuse, the World Water Environment Organization changed the name of the sludge to "biosolids". The exact meaning is: "a city rich in organic matter that can be used effectively. Pollutants". [0003] At present, there are three main methods for treating sludge: comprehensive utilization, landfill and incineration. If the method of landfilling is adopted, on the one hand, it will occupy a large amount of valuable land resources, and cause garbage to beco...

Claims

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Application Information

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