Conditioner for combinedly conditioning sludge and method for dehydrating sludge through utilizing conditioner

A sludge dehydration and combined technology, which is applied in the direction of dehydration/drying/thickened sludge treatment, etc., can solve the problems of high moisture content of factory sludge, high cost of sludge dehydration, large chemical dosage, etc., and achieve improved sludge Dehydration performance, beneficial to subsequent sludge incineration and disposal, and the effect of high organic matter content

Inactive Publication Date: 2013-04-03
NAT ENG RES CENT OF URBAN WATER RESOURCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the problems of high moisture content of ex-factory sludge, large dosage of chemical agents, low calorific value after sludge dehydratio...

Method used

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  • Conditioner for combinedly conditioning sludge and method for dehydrating sludge through utilizing conditioner

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specific Embodiment approach 1

[0010] Specific embodiment one: In this embodiment, a conditioner for combined conditioning sludge is composed of a separately packaged chemical conditioner and a separately packaged physical conditioner, and the individually packaged chemical conditioner is composed of a separately packaged Composed of cationic polyacrylamide CPAM and individually packaged polyaluminum chloride PACl, the individually packaged physical conditioning agent is wood chips, wherein the particle size of the wood chips is 10 mesh to 100 mesh, and the moisture content of the wood chips is <20%.

[0011] The conditioner described in this embodiment reduces the specific resistance of sludge through chemical conditioning, improves sludge dewatering performance, enhances the strength of sludge flocs through physical conditioning, improves the compressibility of sludge cake, and improves sludge Dewatering properties during extrusion.

[0012] The conditioner described in this embodiment reduces the consum...

specific Embodiment approach 2

[0013] Embodiment 2: In this embodiment, the method of sludge dehydration using the conditioner of the combined conditioning sludge of Embodiment 1 is completed according to the following steps:

[0014] 1. Chemical conditioning: first add the pre-dewatered sludge with a moisture content of 90% to 99% into the mixing tank, and then add the individually packaged chemical conditioner to the pre-dehydrated sludge. The packaged chemical conditioning agent is composed of separately packaged cationic polyacrylamide CPAM and separately packaged polyaluminum chloride PACl, and the separately packaged cationic polyacrylamide CPAM and separately packaged polyaluminum chloride PACl are added at the same time Add it to the sludge before dehydration, stir and mix for 1min~5min under the condition of stirring speed of 60rpm~100rpm, stop stirring, and obtain the sludge after chemical conditioning; 2. Physical conditioning: separate packaged physical The conditioning agent is added to the slu...

specific Embodiment approach 3

[0022] Specific embodiment three: the difference between this embodiment and specific embodiment two is that the sludge plate and frame filter press dehydration described in step three is completed according to the following steps: ① one-time extrusion: open the sludge screw pump, Under the condition of 20rpm~60rpm, the conditioned sludge is pumped into the diaphragm plate and frame filter press through the sludge screw pump. With the injection of sludge, the pumping pressure of the sludge screw pump increases from 0Mpa to 0.5Mpa, the pumping time is 0.5h~1h, open the pressure filter water valve of the diaphragm plate and frame filter press to discharge the pressure filter water out of the system, and close the sludge screw pump after the mud feeding is completed, that is, a squeeze is completed; ② Two Secondary extrusion: Turn on the water inlet pump, inject tap water into the diaphragm chamber of the diaphragm plate and frame filter press to dehydrate the sludge with secondar...

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Abstract

The invention relates to a conditioner for combinedly conditioning sludge and a method for dehydrating sludge through utilizing the conditioner, and in particular relate to a conditioner for conditioning the sludge before dehydration and a method for dehydrating the sludge through utilizing the conditioner, belonging to the field of an urban sewage and sludge treatment technology. The conditioner and the method are used for solving the problems of high delivered sludge water content, large pharmaceutical chemicals dosage, low heat value after sludge dehydration and high sludge dehydration cost of the conventional sludge dehydration. The conditioner for combinedly conditioning sludge consists of a separately packaged chemical conditioner and a separately packaged physical conditioner. The method for dehydrating the sludge comprises the following steps: 1, chemical conditioning; 2, physical conditioning; and 3, sludge sheet frame filter pressing and dehydrating to obtain the dehydrated sludge. The conditioner and the method have the advantages that the dehydrated sludge water content is lower than 60%; the chemical conditioning drug dosage is small, the physical conditioning adopts economic wood chips, and the total dosage cost is low; and the dehydrated sludge has high heat value. The conditioner and the method can be used for efficiently dehydrating wastewater and sludge.

Description

technical field [0001] The invention relates to the technical field of municipal sewage sludge treatment, in particular to a conditioning agent for conditioning sludge before dehydration and a method for dehydrating sludge using the conditioner. Background technique [0002] At present, the annual sludge production in my country is 30 million tons (about 8 million tons converted into dry sludge), and it is increasing at a rate of 10% to 15% per year. Most of these sludge are simply landfilled or discarded at will. After properly treated sludge enters the environment, it will directly bring secondary pollution to water bodies and the atmosphere, posing a serious threat to the ecological environment and human activities, and has become an important factor restricting the normal development of my country's water treatment industry. [0003] Sludge is usually pretreated before dewatering. Pretreatment includes chemical conditioning and physical conditioning, and then mechanical d...

Claims

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Application Information

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IPC IPC(8): C02F11/14
Inventor 李圭白丁安梁恒石广济
Owner NAT ENG RES CENT OF URBAN WATER RESOURCE
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