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Medicament for reducing moisture percentage in sewage sludge

A technology of moisture content and chemicals, applied in the field of chemicals for reducing the moisture content of sludge, can solve the problems of large restrictions, high equipment investment, high energy consumption, etc., to suppress the generation of odor, reduce the cost of chemicals, and promote stabilization. Effect

Inactive Publication Date: 2009-08-19
朱英
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology can reduce the moisture content of sludge a lot and has high efficiency, but the disadvantages are large energy consumption, high equipment investment and high cost; (2) solar drying technology This technology has the advantages of energy saving, low operating cost, and no pollution to the environment. However, it is limited by natural conditions; (3) After adding chemical conditioning agents, thermal methods, cold-thawing and other pretreatment methods, the technology is mechanically extruded and dehydrated due to its complex process, high cost, and large investment. affect the practical application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The main indicators of sludge in a sewage treatment plant are shown in Table 1.

[0026] Table 1

[0027] index water content PH value Organic content 82％ 8.1 43％

[0028] Add 100kg of sludge to the mixing mixer, then add 4kg of MgO, 0.6kg of KH 2 PO 4 , 0.4kgAl(H 2 PO 4 ) 2 , 0.5kg anhydrous MgCl 2 , turn on the mixing mixer, the stirring speed is 100r / min, after stirring for 2 minutes, the evenly mixed sludge is naturally piled up for maintenance for 24h, the ambient temperature is 25°C, the humidity is less than 70%, and the pile height is 1 meter. After 24 hours, the moisture content of the sludge was measured to be 52%.

[0029] In the present embodiment, in every 100 parts of sludge, the weight and number ratio of the total medicament added is 5.5% of the weight and number ratio of sludge, so the cost is relatively low, and the used medicament cost is only It is 55 yuan.

Embodiment 2

[0031] The main indicators of a paper mill sludge are shown in Table 2.

[0032] Table 2

[0033] index water content PH value Organic content 78％ 7.8 52％

[0034] Add 100kg of sludge to the mixing mixer, then add 4kg of MgO, 0.5kg of KH 2 PO 4 , 0.3kgAl(H 2 PO 4 ) 2 , 0.5kg anhydrous MgCl 2 . Turn on the mixing mixer, the stirring speed is 100r / min, after stirring for 2 minutes, the evenly mixed sludge is naturally piled up for 24 hours, the ambient temperature is 12°C, the humidity is less than 70%, the pile height is 1 meter, and the sludge is measured after 24 hours Moisture content 50%.

[0035] In the present embodiment, in every 100 parts of sludge, the weight and number ratio of the total medicament added is 5.3% of the weight and number ratio of sludge, so the cost is relatively low, and the used medicament cost is only It is 53 yuan.

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Abstract

The invention discloses a medicament, in particular a medicament used for reducing the water content of the sludge. The medicament used for reducing the water content of the sludge consists of the following components in portion by weight: 3 to 5 portions of MgO, 0.3 to 0.8 portion of KH2PO4, 0.2 to 0.4 portion of Al(H2PO4)2, and 0.3 to 0.8 portion of anhydrous MgCl2. The medicament has the advantages that: (1) the medicament has abundant, cheap and easily obtained raw material sources, and lower cost; (2) the medicament has a low dosage and less change to the pH value of the sludge, and simultaneously inhibits the generation of odor; (3) the medicament does not bring about secondary pollution to the sludge, improves the properties of the sludge, and promotes the stabilization of the sludge; (4) the sludge with a reduced water content can be directly used for preparing a fertilizer through granulation, and the fertilizer does not harm the soil and crops; and (5) the compression strength and the shear intensity of the treated sludge both reach the operating requirements of a large-scale sludge landfill machine.

Description

technical field [0001] The invention relates to a medicament, in particular to a medicament for reducing the water content of sludge. Background technique [0002] In our country, sewage treatment is developing and expanding at an unprecedented speed, followed by an increasing amount of sludge. Therefore, how to deal with sludge has become an urgent problem of solid waste pollution in the environment. According to data, the current annual output of urban sludge in my country is 41 million tons, and it is still growing at a rate of 10% every year. In addition, the sludge produced by industrial sewage treatment plants is even larger, and sludge is different from other solids. Waste, its moisture content is high, about 80%. From the actual situation in Beijing, Shanghai, Tianjin, Shenzhen and other places, the treatment and disposal of sludge mainly adopts methods such as sanitary landfill, composting, incineration and agricultural application. Due to the rheology of the sludge,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14
CPCY02W10/37
Inventor 朱英
Owner 朱英
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