Automatic sludge dewatering system and method

A sludge dehydration and sludge technology, which is applied in the direction of dehydration/drying/concentrated sludge treatment, etc., can solve the problems of large influence of natural conditions, large floor area, and reduced moisture content, and achieve low cost of chemicals and short processing time , good dehydration effect

Pending Publication Date: 2018-12-14
TIANJIN ENEW ENVIRONMENTAL PROTECTION ENGCO LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

The main structure of the natural drying method is the sludge drying field, a flat land surrounded and separated by earth embankments. If the soil has poor water permeability, a thin layer of gravel and sand can be laid, and a drainage pipe is set up to reduce the waste by infiltration and evaporation. The water content of the sludge exiled to the field, the infiltration process is completed in about 2 to 3 days, and the water content can be reduced to about 85%. After that, it mainly depends on evaporation, and it can be reduced to about 75% after a few weeks. This method has a long dehydration cycle. , covers a large area, and is greatly affected by natural conditions

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0055] Turn on the sludge inlet pump, and the sludge solution with a water content of 97.5% in the sewage plant will be pumped into the No. Hydrochloric acid solution, the dosing amount is 3.3ml / 100ml, the pH of the sludge solution after dosing is 1, react for 20min, after the reaction, pump the sludge solution in the No. 1 reaction tank into the No. 2 reaction tank, and the No. 1 reaction The lower limit of the liquid level of the tank is 0. When the sludge solution in the No. 1 reaction tank is emptied, the sludge inlet pump is turned on again; when the liquid level of the No. Pump calcium carbonate solution into the No. 2 reaction tank, the dosing amount is 1.8ml / 100ml, the pH of the sludge solution after dosing is 8, and react for 40 minutes. After the reaction, pump the sludge solution in the No. 2 reaction tank into the buffer In the tank, the lower limit of the liquid level of the No. 2 reaction tank is 0. When the sludge solution in the No. 2 reaction tank is emptied, ...

Embodiment 2

[0057] The sludge solution with a moisture content of 98% in the sewage plant is pumped into the No. 1 reaction tank. When the liquid level of the No. 1 reaction tank is higher than the preset upper limit, the sludge inlet pump is turned off. When the liquid level of the No. 1 reaction tank is lower than the preset At the lower limit, turn on the mud inlet pump again; pump dilute sulfuric acid solution into the No. 1 reaction tank, the dosing amount is 1.1ml / 100ml, the pH setting upper limit of No. 1 reaction tank is 5, and the lower limit is 4, and the sludge solution The residence time in the No. 1 reaction tank is 15min; the sludge in the No. 1 reaction tank is pumped into the No. 2 reaction tank. When the liquid level of the No. 2 reaction tank is higher than the preset upper limit, the No. 1 discharge pump is closed. When the liquid level of the No. 2 reaction tank is lower than the preset lower limit, turn on the No. 1 discharge pump again; pump calcium oxide solution int...

Embodiment 3

[0059] The sludge solution with a moisture content of 97% in the sewage plant is pumped into the No. 1 reaction tank. When the liquid level of the No. 1 reaction tank is higher than the preset upper limit, the sludge inlet pump is turned off. When the liquid level of the No. 1 reaction tank is lower than the preset At the lower limit, open the mud inlet pump again; pump dilute sulfuric acid solution into the No. 1 reaction tank, and the dosing amount is 2ml / 100ml. The residence time in No. 1 reaction tank is 30min; the sludge in No. 1 reaction tank is pumped into No. When the liquid level of the No. reaction tank is lower than the preset lower limit, the No. 1 discharge pump is turned on again; the calcium oxide solution is pumped into the No. 7.5, set the lower limit as 6.5, the residence time of the sludge solution in the No. The moisture content of the dehydrated sludge was determined to be 62%.

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Abstract

The invention provides an automatic sludge dewatering system and method. The automatic sludge dewatering system comprises a sludge inlet pump, an acidifier storage tank, a neutralizer storage tank, areaction tank No. 1, a pH value online monitor No. 1, a liquid level meter No. 1, a reaction tank No. 2, a pH value online monitor No. 2, a liquid level meter No. 2, a buffer tank, a dewatering device, and an automatic module control system. The automatic sludge dewatering system is directed at the characteristics of high moisture content and difficulty in dewatering of sludge, automatically controls chemical addition and dehydration of sludge, improves sludge dewatering effect and achieves sludge reduction.

Description

technical field [0001] The invention relates to the field of sludge treatment, in particular to an automatic sludge dewatering system and method. Background technique [0002] Sludge is a by-product of sewage treatment, with a large output and high moisture content. The composition of sludge is complex, and its solid content is high in organic matter. It contains nutrients such as nitrogen, phosphorus, and potassium, and also contains pollutants such as heavy metals and pathogenic microorganisms. After proper treatment, it can be used as a resource. However, due to the high moisture content of sludge, its output is huge. Generally, the moisture content of undehydrated sludge is about 97%, and the moisture content of dehydrated sludge is about 85%. When the sludge moisture content drops from 97% to 85%, the sludge volume decreases by 80%. Therefore, sludge dewatering is the most effective treatment method for sludge reduction. [0003] Sludge dewatering methods include nat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14C02F11/12
CPCC02F11/12C02F11/14
Inventor 王学科焦海亮吴建光
Owner TIANJIN ENEW ENVIRONMENTAL PROTECTION ENGCO LTD
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