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Preparation and method for drying sludge through deep dehydrating

A kind of sludge, high-level technology, applied in dewatering/drying/concentrating sludge treatment, energy and wastewater treatment, etc., can solve the problems of amazing investment, limited heat dependence, and difficult to achieve general promotion.

Inactive Publication Date: 2011-11-02
ZHEJIANG JIEFENG ENVIRONMENTAL PROTECTION TECH ENG COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although some waste heat is available under certain conditions, this dependence on heat is very limited, because all walks of life are currently saving energy and reducing emissions, and there is less and less waste heat to rely on
On the other hand, if you bring your own heat source, the investment is even more amazing
Therefore, some individual examples in the market are only special cases, and it is difficult to achieve general promotion.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] The amount of sludge to be treated is 1,000 tons (about 1,000 cubic meters), and the moisture content of the sludge is 99%. Add chemicals: 2 kg of cationic polyacrylamide, 250 kg of polyferric sulfate, 500 kg of quicklime and 250 kg of shale mineral powder.

[0058] (1) Preliminary dehydration of sludge gravity concentration:

[0059] After being treated by the sewage treatment plant, 1,000 cubic meters of sludge with a moisture content of 99% is introduced into the gravity concentration tank, and cationic polyacrylamide with an ion degree of 30% is added to the delivery pipeline, mixed through the pipeline, pumped up and sent to the gravity tank. In the concentration tank, the amount of cationic polyacrylamide added is 2 kg, and the sludge is subjected to preliminary solid-liquid separation in the gravity concentration tank. After concentration, the water content of the sludge is 96%, and the volume of the sludge is 250 cubic meters

[0060] , to achieve preliminary...

Embodiment 2

[0073] Example 2 : The amount of sludge to be treated is 1,000 tons (about 1,000 cubic meters), and the moisture content of the sludge is 99%. Add chemicals: 5 kg of cationic polyacrylamide, 500 kg of polyferric sulfate, 2,000 kg of quicklime and 500 kg of shale mineral powder.

[0074] (1) Preliminary dehydration of sludge gravity concentration:

[0075] After being treated by the sewage treatment plant, 1,000 cubic meters of sludge with a moisture content of 99% is introduced into the gravity concentration tank, and cationic polyacrylamide with an ion degree of 30% is added to the delivery pipeline, mixed through the pipeline, pumped up and sent to the gravity tank. In the thickening tank, the amount of cationic polyacrylamide added is 5 kg, and the sludge is subjected to preliminary solid-liquid separation in the gravity thickening tank. After concentration, the water content of the sludge is 94%, and the volume of the sludge is 167 cubic meters. Quantification, the se...

Embodiment 3

[0089] Example 3 : The amount of sludge to be treated is 1,000 tons (about 1,000 cubic meters), and the moisture content of the sludge is 99%. Add chemicals: 10 kg of cationic polyacrylamide, 1,500 kg of polyferric sulfate, 3,750 kg of quicklime and 1,500 kg of shale mineral powder.

[0090] (1) Preliminary dehydration of sludge gravity concentration:

[0091] After being treated by the sewage treatment plant, 1,000 cubic meters of sludge with a moisture content of 99% is introduced into the gravity concentration tank, and cationic polyacrylamide with an ion degree of 30% is added to the delivery pipeline, mixed through the pipeline, pumped up and sent to the gravity tank. In the concentration tank, the ionicity of cationic polyacrylamide is 30%, and the amount of cationic polyacrylamide added is 2 kg. The sludge is subjected to preliminary solid-liquid separation in the gravity concentration tank. After concentration, the water content of the sludge is 92%. The volume is...

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Abstract

The invention relates to a preparation and a treatment method, and especially relates to a preparation and a method for drying sludge through deep dehydrating. The preparation comprises: 0.000002 to 0.00001 parts of an organic polymeric flocculants, 0.00025 to 0.0025 parts of a coagulating modifier, 0.0005 to 0.00375 parts of a sterilizing deodorant, and 0.00025 to 0.0025 parts of a nucleating converting agent. The method comprises the following steps: a sludge gravity thickening initial dehydrating step, a sludge regulating step, a mechanical press-filtrating step, and a filtrate refluxing step. With the preparation and the method provided by the present invention, sludge deep dehydrating processes can be carried out in series, processing efficiency can be improved, and energy consumption can be reduced. The controllability of the method is high. With the method, recycling is realized.

Description

technical field [0001] The invention relates to a formula and a treatment method, in particular to a formula for highly dehydrating and drying sludge and a preparation method thereof. Background technique [0002] The so-called sludge refers to the terminal waste of sewage treatment plants. These sludges contain a large number of microorganisms, pathogens, emit stench, and some also contain heavy metals. The general policy of my country's sludge treatment and disposal is "reduction, safety, resources change". To properly deal with the problem of sludge disposal, the first step is to reduce the water content. If the sludge moisture is reduced from 97% to 40%, the capacity reduction rate can reach 0.05. For incinerated sludge, since every kilogram of water fed into the furnace for gasification and incineration requires about 800-1000 kcal of heat internally, no matter what type of furnace it is, this is a hard indicator. If the water in front of the furnace is reduced, the he...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14
CPCY02W10/37
Inventor 求汉军应国庆
Owner ZHEJIANG JIEFENG ENVIRONMENTAL PROTECTION TECH ENG COMPANY
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