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Method for deep dewatering sludge

A deep dehydration and sludge dehydration technology, applied in the direction of dehydration/drying/thickened sludge treatment, etc., can solve the limitation of biological treatment or incineration utilization, the decrease of the calorific value of sludge with organic matter content, and the large amount of conditioning chemicals, etc. low cost of chemicals and later landfill disposal, significant volume reduction of sludge, and good dehydration effect

Inactive Publication Date: 2017-03-29
上海广神生态环保科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of adding lime to ferric chloride is that the dosage of the conditioning agent is too large, which increases the dry basis of the sludge. Although the sludge can reduce the volume by about 25%, the dry basis also increases by 25%. The properties of sludge have changed greatly, the content of organic matter and the calorific value of sludge have dropped significantly, and its subsequent biological treatment or incineration is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] The sludge of Shanghai Shidongkou Sewage Treatment Plant is used as the treatment object for deep dehydration. Shanghai Shidongkou Sewage Treatment Plant is located along the Yangtze River in Baoshan District, with a sewage collection capacity of 400,000 m 3 / d, peak sewage volume 6.018m 3 / s, of which industrial wastewater accounts for about 40%, and domestic sewage accounts for about 60%. Sewage treatment adopts the UNI-TANK integrated secondary biological treatment process for nitrogen and phosphorus removal. After the treatment, the tail water reaches the first-level B discharge standard and is discharged into the Yangtze River underwater by the bank.

[0056] This embodiment mainly utilizes the plate and frame filter press type sludge dewatering machine assembled in the pilot test (filtering area 10m 2 ;Theoretical filter chamber volume 0.146m 3 ;Filter plate size 800mm×800mm×60mm: pressing pressure ≤14Bar. According to the regulations and requirements of "Slud...

Embodiment 2

[0088] Processing object is with embodiment 1.

[0089] A method for deep dehydration of sludge, the steps comprising:

[0090](1) Equipment inspection (same as Example 1).

[0091] (2) Prepare polymer flocculant and dehydration aid (same as Example 1).

[0092] (3) Sludge extraction

[0093] 1 m of sludge with a water content of 97.7% and a pH of 6.7 3 Extract it into the sludge conditioning reaction tank and stir at a speed of 40-60r / min ， Mix muddy water evenly.

[0094] (4) Add dehydration aid and polymer flocculant, disperse and react

[0095] ①Addition of dehydration aid

[0096] Add 3.22kg of the dehydration aid prepared in step (2) into the conditioning tank of step (3), with a dosage ratio of 14%, and stir at a speed of 80r / min for 30min until uniformly mixed.

[0097] ② Addition of polymer flocculant

[0098] Add 34.5g of the polymer flocculant prepared in step (2) into the conditioning tank of step (4) ①, the dosage ratio is 1.5‰, and stir at a speed of 30r / ...

Embodiment 3

[0111] Processing object is with embodiment 1.

[0112] A method for deep dehydration of sludge, the steps comprising:

[0113] (1) Equipment inspection (same as Example 1).

[0114] (2) Prepare polymer flocculant and dehydration aid (same as Example 1).

[0115] (3) Sludge extraction

[0116] 1 m of sludge with a water content of 97.7% and a pH of 6.9 3 Extract it into the sludge conditioning reaction tank and stir at a speed of 40-60r / min to make the mud and water evenly mixed.

[0117] (4) Add dehydration aid and polymer flocculant, disperse and react

[0118] ①Addition of dehydration aid

[0119] Add 2.76kg of the dehydration aid prepared in step (2) into the conditioning tank of step (3), the dosage ratio is 12%, and stir at a speed of 40r / min for 30min until the mixture is uniform.

[0120] ② Addition of polymer flocculant

[0121] Add 28.8g of the polymer flocculant prepared in step (2) into the conditioning tank of step (4) ①, the dosage ratio is 1.25‰, and stir...

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Abstract

The invention provides a method for deep dewatering sludge. Dewatering is conducted through plate-frame pressure filtration type sludge dewatering equipment. The method comprises the steps of 1 equipment inspecting, 2 preparing of a polymeric flocculant and a dewatering auxiliary, 3 sludge extracting, 4 dewatering auxiliary and polymeric flocculant adding, dispersing and reacting, 5 sludge pump working, 6 pressure filtration dewatering, 7 sludge discharging, 8 parameter recording and 9 equipment cleaning. According to the method, the adopted polymeric flocculant is a cationic organic polymeric flocculant with a long chain structure, the chain has many active cationic groups which can neutralize negative charges on sludge particles and bond multiple sludge particles simultaneously, and therefore dewatering is promoted; the dewatering auxiliary is high-activity plant fiber and can change and increase the sludge floccule structure and construct a net-shaped skeleton. The water content of the sludge dewatered through the method is lower than 60%, the organic matter contents and the sludge caloric values of the sludge before and after dewatering basically keep invariable, subsequent drying and burning treatment is promoted, and the significant governance advantages are achieved.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to sludge treatment technology, and is a method for deep dehydration of sludge by using high-efficiency compounding agents and auxiliary agents. Background technique [0002] Sewage treatment is one of the important contents of environmental governance. Sludge is an inevitable product of sewage treatment. According to statistics, every 10,000 tons of sewage treated will produce 9 tons of sludge with a moisture content of 80%. By 2013, my country's annual sludge production was about 48.95 million tons, but the safe disposal rate of sludge was less than 5%. This must be paid attention to and has practical and effective methods and means to deal with it. [0003] The sludge involved in this patent application mainly includes the following types: (1) Primary sludge: refers to the sludge produced in the primary treatment process of sewage treatment, that is, the sludg...

Claims

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Application Information

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IPC IPC(8): C02F11/14C02F11/12
Inventor 刘俭时珍宝余洪侠
Owner 上海广神生态环保科技有限公司
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