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Riverway high-water-content sludge dewatering method

A technology with high water content and sludge, applied in the direction of water/sludge/sewage treatment, water/sewage treatment, chemical instruments and methods, etc., can solve the problem of affecting the storage and utilization efficiency of sludge, high water content, and unable to meet the high content of rivers Requirements for high-efficiency and rapid treatment of water volume and sludge, etc., to ensure storage and utilization efficiency, improve dehydration rate, and meet the effects of efficient and rapid treatment

Pending Publication Date: 2020-08-21
TIANJIN ZHENJIN ENG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the silt cleared from the river is rich in inorganic substances, its water content is too high to meet the needs of production, and it needs to be dehydrated
However, the dehydration rate of the high water content sludge in the current river channel is not high during the dehydration process, which affects the storage and utilization efficiency of the sludge, and cannot meet the efficient and rapid treatment requirements for the high water content sludge in the river channel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0035] As preferably, the preparation method of the modified sludge dewatering agent in the step (4) is characterized in that it comprises the following steps: first 10-17 parts of calcium oxide, 10-13 parts of ferric chloride, 5- Add 25 parts of modified starch, 6-12 parts of diatomaceous earth, 14-20 parts of volcanic rock, 0.2-0.8 parts of bentonite, 0.1-1 part of talc powder and 0.3-0.9 parts of chitosan into the polymerization kettle, and stir magnetically for 35- After 40 minutes, add 10-17 parts of gelatin and 1-4 parts of polyacrylamide, react for 2-2.5 hours, evaporate to dryness, and make powder to obtain a modified sludge dehydrating agent.

[0036] As preferably, the mixer in the step (4) adopts a V-type mixer.

[0037] As a preference, the sludge dewatering device in the step (5) adopts any one of a plate and frame dehydrator, a belt press filter dehydrator, a centrifugal dehydrator and a screw press dehydrator.

[0038] As preferably, the pressing pressure of th...

Embodiment 1

[0042] A method for dewatering sludge with high water content in a river course, the steps are:

[0043] (1) Use the crushing mechanism in the dredger to break up the silt at the bottom of the river, then use the suction mechanism in the dredger to suck the silt onto the dredger, and transfer the silt to the silt storage tank for standing, spare;

[0044] (2) After the silt is stratified, the upper layer of mud is separated from the lower layer of silt;

[0045] (3) Add the lower layer of sludge to the reaction tank, and add microbial flocculant NOC-1 to pretreat the sludge that needs to be dehydrated. The weight ratio of microbial flocculant NOC-1 to the lower layer of sludge added to the reaction tank is 1:1000, and fully stir for 30 minutes to mix homogeneously, mixture 1 is obtained;

[0046] (4) Add modified sludge dewatering agent to the mixture obtained in step (3), and use a V-type mixer to fully stir for 24 minutes to mix evenly to obtain mixture 2, add mixture 2 to...

Embodiment 2

[0053] A method for dewatering sludge with high water content in a river course, the steps are:

[0054] (1) Use the crushing mechanism in the dredger to break up the silt at the bottom of the river, then use the suction mechanism in the dredger to suck the silt onto the dredger, and transfer the silt to the silt storage tank for standing, spare;

[0055] (2) After the silt is stratified, the upper layer of mud is separated from the lower layer of silt;

[0056] (3) Add the lower layer of sludge to the reaction tank, and add microbial flocculant PF101 to pretreat the sludge that needs to be dehydrated. The weight ratio of microbial flocculant PF101 to the lower layer of sludge added to the reaction tank is 1:500, fully stir for 55 minutes and mix evenly to obtain a mixture one;

[0057] (4) Add modified sludge dehydrating agent to the mixture obtained in step (3), and use a V-type mixer to fully stir for 40 minutes to mix evenly to obtain mixture 2, add mixture 2 to the sludge...

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Abstract

The invention provides a riverway high-water-content sludge dewatering method. The method comprises the following steps: breaking sludge at the bottom of a riverway by using a sludge breaking mechanism in a dredger, transferring the sludge into a sludge storage tank, and standing for later use; separating upper-layer sludge from lower-layer sludge; preprocessing sludge needing to be dewatered to obtain a first mixture; adding a modified sludge dewatering agent to obtain a second mixture, and carrying out preliminary dewatering on the second mixture; carrying out secondary dewatering treatment,and separating again; mixing the sludges, and separating sludge and water; carrying out purification treatment on the separated water; and mixing the sludges to form a compact sludge cake. The invention provides the feasible dewatering process for dewatering the high-water-content sludge in the riverway; by adding a flocculating agent and the modified sludge dewatering agent and cooperating witha sludge dewatering device and a high-pressure squeezer for multiple times of dewatering treatment, the dewatering rate is effectively increased, the storage and utilization efficiency of sludge is guaranteed, and meanwhile the efficient and rapid treatment requirement of high-water-content sludge of the riverway is met.

Description

technical field [0001] The invention relates to the technical field of river silt treatment, in particular to a method for dewatering river silt with high water content. Background technique [0002] Silt has a natural moisture content higher than the liquid limit, and the void ratio is mostly greater than 1.0; the dry density is small, only 0.8-0.9 g / cm3, and river siltation has affected the normal performance of various functions such as flood control, drainage, irrigation, water supply, and navigation. In order to ensure the normal function of the river and promote the rapid and sustainable development of the economy and society, it is necessary to carry out dredging and dredging of the river. Although the silt cleared from the river is rich in inorganic substances, its water content is too high to meet the needs of production, and it needs to be dehydrated. However, the dehydration rate of high water content sludge in the current river channel is not high during the deh...

Claims

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Application Information

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IPC IPC(8): C02F11/121C02F11/122C02F11/123C02F11/125C02F11/127C02F11/148C02F1/44C02F11/12C02F11/02
CPCC02F11/121C02F11/148C02F11/122C02F11/123C02F11/127C02F11/125C02F1/441C02F11/12C02F11/02
Inventor 周雨晖吴波陈珉葛建龙张妍开刘建民梁静波
Owner TIANJIN ZHENJIN ENG GRP
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