Deep dehydration method for solidifying fresh sludge through landfill stabilized sludge incineration residue

A technology of sludge incineration and deep dewatering, applied in dewatering/drying/concentrating sludge treatment, etc., can solve the problems of high cost of dewatering agent, difficult deep dewatering treatment, low cost performance, etc. The effect of digging and resource utilization and improving dewatering performance

Active Publication Date: 2014-02-05
上海环保工程成套有限公司
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AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to solve the problems of mining and utilization of existing landfill sludge, high cost of existing sludge dewatering agents, low cost performance, and difficulty in deep dehydration treatment, and to utilize the residual inorganic dehydrating agent content in landfill stabilized sludge High, and after the incineration treatment, the properties are activated and the structure is loose. It provides a deep dehydration method that utilizes the landfill stabilized sludge incineration residue to solidify the fresh sludge.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In this example, the fresh sludge to be treated is the product obtained by concentrating and centrifuging the sludge of a sewage treatment plant in Shanghai, with a water content of 82.7%.

[0024] The landfill stabilized sludge incineration residue used is the residue of sludge incinerated at 900 °C for 1 hour after three years of sanitary landfill in a landfill in Shanghai. Before sanitary landfill, the sludge has undergone the following processes Treatment: Add an inorganic dehydrating agent of 4% of the weight of the sludge to the sludge that has been pre-dehydrated to a moisture content of 83.6%, mix well and then dehydrate deeply, so that the moisture content of the sludge is 59.7%; among them, the inorganic dehydrating agent is A mixture of lime, magnesium oxide and cement prepared in a weight ratio of 1:1:1.

[0025] Specific steps are as follows:

[0026] 1) Add water to the fresh sludge with a water content of 82.7% to adjust the water content to about 90%, a...

Embodiment 2

[0030] The same as in Example 1, except that the addition ratio of landfill stabilized sludge was changed to 25%, the CST of the obtained mixed sludge was reduced to 440.5s, and the moisture content was reduced to 56.2% after pressure filtration. Compared with Example 1, it can be seen that the dewatering performance of sludge is improved to a certain extent with the increase of the addition ratio of landfill stabilized sludge incineration residue, but the improvement range is not obvious.

Embodiment 3

[0032] Same as Example 1, except that the sludge taken is sludge from a sewage treatment plant in Shanghai, with a moisture content of 84.3%, and the landfill stabilized sludge incineration residue used is a landfill in Shanghai that has been buried for 2 years. The residue after the sludge was incinerated at 900°C for 1 hour. The addition ratio of landfill stabilized sludge incineration residue is 20%.

[0033] When adding water to fresh sludge to about 90%, the CST is 4231.3s. After adding 20% ​​landfill stabilized sludge incineration residue, the sludge CST drops to 356.7s, and the dehydration performance is significantly improved. After deep dehydration by filter press , the moisture content of the sludge is reduced to 54.5%, which can meet the needs of subsequent sludge treatment and disposal.

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Abstract

The invention discloses a deep dehydration method for solidifying fresh sludge through landfill stabilized sludge incineration residue. The method comprises two steps of chemical conditioning and modifying: adding water into fresh sludge to be dehydrated into sludge with moisture content of 80%-85%, conditioning into sludge with moisture content of 90%-93%, adding landfill stabilized sludge incineration residue 10%-30% the weight of the sludge, mixing uniformly; mechanical squeezing and deep dehydrating: pumping the conditioned sludge into a plate-and-frame filter press, deep dehydrating for 1 hour under the pressure of 1MPa. The method has the advantages that due to the utilization of the landfill stabilized sludge incineration residue, the capillary water absorption time of the sludge can be obviously shortened, and the dehydration performance of the sludge can be sharply improved; after filter pressing and dehydrating, the moisture content of the sludge is reduced to be less than 60%; the waste is used for processing waste, the dehydration performance of fresh sludge can be greatly improved, and the landfill stabilized sludge is excavated and recycled.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment and resource utilization, and relates to a deep dehydration method for solidifying fresh sludge by utilizing landfill stabilized sludge incineration residues. Background technique [0002] At present, the main methods of sludge treatment and disposal in my country are composting, sanitary landfill, incineration and land utilization. Among them, sanitary sludge landfill has become the most commonly used method for sludge disposal in my country because of its short construction period, low investment, convenient management, and simple operation. However, with the continuous increase of the sewage treatment capacity of my country's sewage treatment plants, the sludge production continues to increase, which makes the land for urban landfills increasingly tight. In order to ensure the sustainable development of sludge landfills, the land occupied by landfill sludge cannot The avoided need to b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14C02F11/12
Inventor 王少波贾廷纲缪幸福邬方良林梅菁米琼赵由才
Owner 上海环保工程成套有限公司
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