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Sludge dewatering method

A sludge dewatering and sludge technology, which is applied in water/sludge/sewage treatment, sludge treatment, sludge drying, etc., can solve problems such as increased power consumption, reduce treatment costs, reduce capacity, and achieve dewatering efficiency. improved effect

Inactive Publication Date: 2012-03-21
KURITA WATER INDUSTRIES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the electrolyte in the liquid increases, and the amount of electricity required to separate the water increases.

Method used

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  • Sludge dewatering method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Add 5 to 20% by weight (in terms of Fe relative to SS) polyiron sulfate (polyiron) to excess sludge (MLSS 5000mg / L, 7% fibrous content) in food drainage, and stir rapidly for 2 minutes After that, 0.8% by weight (relative to SS) of an amphoteric polymer (Kurita Kogyo Co., Ltd.: クリベスト P350) was added, and the conditioned sludge was conditioned at a low speed for 1 minute, and the conditioned sludge was subjected to mechanical dehydration using a belt press. Part and electro-osmotic dehydration part of the electro-osmotic dehydration device, perform mechanical dehydration under the following conditions, and then perform electro-osmotic dehydration treatment.

[0063]

[0064] Pressure: 1kgf / cm 2 (98kPa)

[0065] Dehydration time: 2 minutes

[0066]

[0067] Pressure: 1kgf / cm 2 (98kPa)

[0068] Power supply: DC40V

[0069] Dehydration time: 20 minutes

[0070] The relationship between the moisture content of the obtained dewatered sludge and the amount of polyiro...

Embodiment 2

[0084] In Example 1, dehydration was performed in the same manner as in Example 1, except that ferric chloride was used instead of polyferric sulfate, and 10% by weight (in terms of Fe) of ferric chloride was added to the SS of the excess sludge for conditioning. As a result of the treatment, the moisture content of the obtained dewatered sludge was 64%.

[0085] From this result, it can be seen that the iron-based inorganic flocculant is not limited to polyferric sulfate, and that ferric chloride is also effective, but polyferric sulfate has a higher effect.

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Abstract

A sludge-dewatering method which makes it possible to dewater even sludge little containing easily dewaterable components such as fibrous substance and sand to a water content of 60% or below through electro-osmotic dehydration, specifically, a method of dewatering sludge generated in the biological treatment of wastewater by the use of an electro-osmotic dehydration apparatus, wherein the sludgeis conditioned by the addition of an iron inorganic coagulant and then dewatered in an electro-osmotic dehydration apparatus. The iron inorganic coagulant is preferably ferric sulfate and the amount thereof added is preferably 5 to 20wt% in terms of Fe based on the SS of the sludge.

Description

technical field [0001] The present invention relates to a method for dewatering sludge produced in biological treatment of industrial wastewater by using an electro-osmotic dewatering device, in particular to a dewatered sludge with significantly reduced water content by improving the conditioning method of sludge before electro-osmotic dewatering Methods. Background technique [0002] Sludge produced in biological treatment of industrial wastewater contains a large amount of water, so it is usually treated as waste after dewatering. Conventionally, dewatering of sludge has used a mechanical dewatering device such as a pressurized dehydrator such as a belt press or a filter press, or a centrifugal dehydrator. Using these dewatering devices, except for some sludges (sludges containing many easily dewaterable components such as fibrous and sand components), the water content cannot be reduced to a sufficiently low level, and the obtained dewatered sludge has a minimum water c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/12B01D21/01B01D35/06C02F11/14C02F11/121C02F11/143C02F11/147C02F11/15
CPCF26B5/005C02F11/121C02F1/4698C02F11/12C02F11/14F26B2200/18F26B5/00
Inventor 增井孝明正冈融
Owner KURITA WATER INDUSTRIES LTD