Unlock instant, AI-driven research and patent intelligence for your innovation.

Sludge conditioner, and deep dehydration method by using the same

A sludge conditioning and deep dehydration technology, which is applied in the direction of dehydration/drying/concentrated sludge treatment, etc., can solve the problems of ineffectiveness, large amount of chemical addition, and insignificant conditioning effect, so as to improve dehydration efficiency and filter press performance Improvement, ease of transportation and subsequent treatment and disposal effects

Inactive Publication Date: 2014-05-21
TONGJI UNIV
View PDF8 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems in the prior art that the addition amount of the medicament is relatively large, cannot act on the water inside the cells, and the conditioning effect is not significant, the purpose of the present invention is to provide a sludge conditioner, which is non-toxic and harmless, and the addition amount is relatively low. less, no secondary pollution to the environment, etc.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Grind magnesite with a weight percentage of 40% and limestone with a weight percentage of 60% to form a powder, mix them, put them into a muffle furnace and burn them at 900°C for 1 hour, and cool down to room temperature naturally to make a sludge conditioner. The X-ray fluorescence spectrometer detects the elements therein. In terms of oxides, the weight percentage of MgO in the conditioner is 30%, the weight percentage of CaO is 40%, and the weight percentage of ash is 30%. The ash content is calculated as oxides, including silicon dioxide (24% by weight), ferric oxide (1% by weight), potassium oxide (3.1% by weight), phosphorus pentoxide (1.5% by weight ), aluminum oxide (0.4% by weight).

[0031] The moisture content of the dewatered sludge taken from a sewage plant in Shanghai is 77%, and 50% of the weight of the sludge is added with water to adjust the moisture content of the sludge to 85%. The above-mentioned sludge conditioner is added in an amount of 20% by w...

Embodiment 2

[0033] Grinding 50% magnesite and 50% limestone into powder, mixing them, putting them into a muffle furnace and burning them at 1000°C for 1.5h, cooling down to room temperature naturally, to make a sludge conditioner, X-ray fluorescence spectrometer is used to detect the elements therein. In terms of oxides, the weight percentage of MgO in the conditioner is 45%, the weight percentage of CaO is 30%, and the weight percentage of ash is 25%. The ash content is calculated as oxides, including silicon dioxide (18% by weight), ferric oxide (0.6% by weight), potassium oxide (2.9% by weight), phosphorus pentoxide (3.2% by weight ), aluminum oxide (0.3% by weight).

[0034] The moisture content of the dewatered sludge from a printing and dyeing factory in Jiangyin was 80%, and 30% of the weight of the sludge was added with water to adjust the moisture content of the sludge to 85%. The above-mentioned sludge conditioner is added in an amount of 5% by mass based on the dry weight of ...

Embodiment 3

[0036] Grind magnesite with a weight percentage of 70% and limestone with a weight percentage of 30% into powder, mix them, put them into a muffle furnace and burn them at 950°C for 2 hours, and cool down to room temperature naturally to make a sludge conditioner. The X-ray fluorescence spectrometer detects the elements therein. In terms of oxides, the weight percentage of MgO in the conditioner is 60%, the weight percentage of CaO is 20%, and the weight percentage of ash is 20%. The ash content is calculated as oxides, including silicon dioxide (10% by weight), ferric oxide (0.3% by weight), potassium oxide (2.8% by weight), phosphorus pentoxide (6.7% by weight ), aluminum oxide (0.2% by weight).

[0037] The remaining sludge obtained from the secondary settling tank of a sewage plant in Fuyang has a water content of 92%, and the above sludge conditioner is mixed with a mass percentage of 30% of the dry weight of the sludge. After stirring for 15 minutes, the capillary water...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention belongs to the technical field of comprehensive utilization of solid waste, discloses a sludge conditioner, and a deep dehydration method by using the sludge conditioner. The sludge conditioner provided by the present invention comprises the following components, by weight, 30-60% of MgO, 20-40% of CaO and 20-30% of ash. The preparation method provided by the present invention comprises the following steps: grinding 40-70% by weight of magnesia and 30-60% by weight of limestone into powders, and mixing the powders; conveying the powders to a muffle furnace and burning for 1-2 hours at a temperature of 900-1000 DEG C; naturally cooling to the room temperature to prepare the sludge conditioner. The invention further discloses the deep dehydration method by using the sludge conditioner. The deep dehydration method comprises the following steps: adding the sludge conditioner to sludge, wherein the adding amount of the sludge conditioner is 5-30% of the dry weight of the sludge; stirring for 10-20 minutes; carrying out dehydration for the uniformly-stirred sludge. The sludge conditioner is nontoxic and harmless; with adopting the deep dehydration method by using the sludge conditioner, the water content in the sludge is rapidly reduced to less than 60%.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of solid waste, and relates to a sludge conditioner and a deep dehydration method using the sludge conditioner. Background technique [0002] Sludge is a viscous substance produced in the process of sewage treatment. It is mainly composed of aerobic and anaerobic microorganisms. It has a high content of organic matter and is closely combined with water. Generally, the water content of the sludge in the secondary sedimentation tank of the sewage plant is 97% to 99%, of which the interstitial water accounts for about 70%, the capillary water accounts for about 20%, the adsorbed water is about 7%, and the intracellular water is about 3%. At present, after sedimentation and dehydration of sewage plant sludge, the water content is 75% to 85%. At this time, the water form in the sludge is mainly adsorbed water and intracellular water. Ordinary filter presses and centrifugal dehydrator...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/14
Inventor 赵由才宋玉汪宝英甄广印
Owner TONGJI UNIV