Combined chemical conditioning method for deep drying of dehydrated sludge

A dewatered sludge and combined technology, which is applied in the direction of dewatering/drying/thickening sludge treatment, oxidation treatment sludge, etc., can solve the problems of ecological environment hazards and large land occupation, and achieve pollution reduction, reduction of usage, and flow sex good effect

Active Publication Date: 2016-06-08
BENGBU QIRUN ENVIRONMENTAL ENG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Dewatered sludge is rich in organic matter, salt, a large amount of phosphorus, nitrogen and other substances in sewage, as well as toxic and harmful substances such as virus microorganisms, parasite eggs, and heavy metals. Land, and with the infiltration of leachate and the spread of bacteria in the air, it causes considerable harm to the ecological environment

Method used

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Examples

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Comparison scheme
Effect test

Embodiment 1

[0030] The present invention provides a combined chemical conditioning method for deep drying of dewatered sludge, which includes the following steps:

[0031] a) Take 100kg of dewatered sludge and place it in the reactor. The measured pH value of the dewatered sludge is 6.85 and the moisture content is 80.67%, and the absolute amount of sludge is calculated; add water to the reactor to dilute the dewatered sludge and turn it on at the same time Stir, the stirring rate is controlled at 150 rpm, so that the water content of the diluted dehydrated sludge is 92%; then add 10% by mass concentrated sulfuric acid to the reactor until the pH of the dehydrated sludge is 5, and continue to stir 10 minutes;

[0032] b) Add potassium ferrate to the reaction kettle. The dosage of potassium ferrate is 0.1% of the absolute dry sludge. Potassium ferrate is added in the form of a solution with a mass percentage concentration of 0.5% and a pH value of 9, at 200 Stir for 5 minutes at a rate of revo...

Embodiment 2

[0037] The present invention provides a combined chemical conditioning method for deep drying of dewatered sludge, which includes the following steps:

[0038] a) Take 100kg of dehydrated sludge and place it in the reactor. The pH value of the dehydrated sludge is 6.93 and the moisture content is 79.28%, and the absolute dry sludge content is calculated; add water to the reactor to dilute the dehydrated sludge and turn it on at the same time Stir, the stirring rate is controlled at 150 rpm, so that the water content of the diluted dewatered sludge is 90%; then add 10% by mass concentrated sulfuric acid to the reactor until the pH of the dewatered sludge is 4, and continue to stir 10 minutes;

[0039] b) Add potassium ferrate to the reactor. The dosage of potassium ferrate is 0.3% of the absolute dry sludge. Potassium ferrate is added in the form of a solution with a mass percentage concentration of 1% and a pH of 10, with a concentration of 200 Stir for 5 minutes at a rate of revo...

Embodiment 3

[0044] The present invention provides a combined chemical conditioning method for deep drying of dewatered sludge, which includes the following steps:

[0045] a) Take 100kg of dewatered sludge and place it in the reactor. The pH value of the dewatered sludge is measured to be 7.02 and the moisture content is 81.47%, and the absolute dry sludge content is calculated; add water to the reactor to dilute the dewatered sludge and turn it on at the same time Stir, the stirring rate is controlled at 150 rpm, so that the water content of the diluted dehydrated sludge is 93%; then add 10% by mass concentrated sulfuric acid to the reactor until the pH value of the dehydrated sludge is 4.55, and continue to stir 10 minutes;

[0046] b) Add potassium ferrate to the reaction kettle. The dosage of potassium ferrate is 0.5% of the absolute dry sludge. Potassium ferrate is added in the form of a solution with a mass percentage concentration of 2% and a pH of 11, with a concentration of 200 Stir ...

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PUM

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Abstract

The invention discloses a combined chemical conditioning method for deep drying of dehydrated sludge. The method comprises steps as follows: to-be-treated dehydrated sludge is diluted with water, so that the moisture content of the dehydrated sludge is 90%-93%, strong acid is added to adjust the pH value to range from 4 to 5 after dilution, then potassium ferrate with the adding amount accounting for 0.1%-0.5% of that of absolutely dried sludge amount is added in the form of a solution with the mass percent concentration of 0.5%-2% and the pH value of 9-11, and oxidation treatment is finished after stirring for full reaction; then poly-aluminum chloride salt with the adding amount accounting for 4%-10% of that of absolutely dried sludge amount is added for coagulation treatment; then calcium hydroxide with the adding amount accounting for 0.3%-1% of that of absolutely dried sludge amount is added to adjust the pH value to range from 6 to 7, finally, poly-quaternary ammonium salt with the adding amount accounting for 0.1%-0.3% of that of absolutely dried sludge amount is added for filtration aiding, and chemical conditioning is finished. Through optimized combination of dilution, acidification, oxidation, coagulation, flocculation, filtration aiding and the like, the effect of bound water on sludge can be reduced, indexes including specific resistance of sludge, compressibility, hydraulic characteristic and the like can be improved, the proportion of releasable free water can be effectively increased, and the sludge dehydrating effect can be improved.

Description

Technical field [0001] The invention relates to the field of dehydrated sludge treatment, in particular to a combined chemical conditioning method for deep drying of dehydrated sludge. Background technique [0002] Sludge is a product in the process of sewage treatment. Generally, the treated sludge (dewatered sludge) discharged from urban sewage treatment plants is a semi-solid substance with a water content of 75-85%, which is mainly composed of organic debris, bacterial cells, and inorganic The composition of particles, colloids and agents used for flocculation is a complex mixture. The dewatered sludge is rich in organic matter, salt and a large amount of phosphorus, nitrogen and other toxic and harmful substances in the sewage, as well as virus microorganisms, parasite eggs, heavy metals and other toxic and harmful substances. Land, and with the infiltration of leachate and the spread of bacteria in the air, it causes considerable harm to the ecological environment. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14C02F11/06
CPCC02F11/06C02F11/14
Inventor 徐重建李国亮康婷婷杨璇
Owner BENGBU QIRUN ENVIRONMENTAL ENG TECH CO LTD
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