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A treatment method for dewatered sludge in a domestic sewage treatment plant

A technology for dewatering sludge and domestic sewage, used in dewatering/drying/concentrating sludge treatment, etc., can solve the problems of long maintenance time, low efficiency, and limited sources, and achieve short maintenance time, high strength, and sludge solidification. Simple process effect

Inactive Publication Date: 2011-12-14
SHANGHAI TONGJI CONSTR CO LTD
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Problems solved by technology

The invention adopts a wide variety of raw materials, and the sources are not extensive, the maintenance time is very long, and the efficiency is very low

Method used

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  • A treatment method for dewatered sludge in a domestic sewage treatment plant
  • A treatment method for dewatered sludge in a domestic sewage treatment plant

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Experimental program
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Effect test

Embodiment 1

[0030] A pilot test of sludge solidification treatment was carried out at a large domestic waste landfill in Shanghai.

[0031]In the first step, the three mineral powders of limestone, magnesite and bauxite taken from Chaohu Lake in Anhui Province are mixed according to the weight percentage of 55%: 20%: 25%, and then mixed evenly and then burned. The burning temperature is 1000 ° C. The burning time is 2 hours, and the sludge solidification agent is obtained after cooling. After testing, the weight percentage of each component in the sludge solidifying agent is MgO=10%~30%, Al 2 o 3 =15%~20%, CaO=40%~45%, SiO 2 =4%~8%, Fe 2 o 3 = 2% ~ 3%, SO 3 = 1% ~ 2%, ash = 8% ~ 12%;

[0032] The main components of the above limestone are CaO 82.1%, MgO 0.5%, Al 2 o 3 0.05%, SiO 2 3.6%, Fe 2 o 3 1.25%, SO 3 1.1% and 11.4% ash.

[0033] The main components of the above-mentioned magnesite are MgO 73.5%, CaO 2.2%, SiO 2 9%, Fe 2 o 3 2.5%, SO 3 0.8%, ash 12%.

[0034] The...

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Abstract

The invention relates to a treatment method of dehydrated sludge in a domestic sewage treatment plant. The treatment method comprises the following steps: evenly mixing limestone, magnesia and bauxite which are weighed in a ratio of (40%-60%):(20%-30%):(20%-30%) by weight percent and then firing for 1-2 hours at the temperature of 900 DEG C-1200 DEG C so as to obtain a sludge solidifying agent; adding the sludge solidifying agent in the dehydrated sludge in the ratio of dehydrated sludge to sludge solidifying agent of (90%-95%):(5%-10%) by weight percent, and then stirring; after evenly mixing, paving the mixture obtained in the former step to the thickness of 20-30 cm in the open air, and placing for 48 hours so as to obtain a sludge solidifying body; and finally, performing landfill treatment. According to the invention, the solidifying time is short, and the adding amount of the sludge solidifying agent is less; by using the treatment method, sludge can be modified, and the stabilization of sludge is promoted; the bulking of the sludge solidifying body is small, the stability and mechanical strength of the sludge solidifying body are high, and secondary pollution can not be caused; and the solidifying technological process is simple and convenient for operation, and the investment and treatment costs are low, thus the treatment method in the invention can be widely applied to stabilization, reduction and innocent treatments of dehydrated sludge in a sewage plant.

Description

technical field [0001] The invention relates to a treatment method for dewatered sludge in a domestic sewage treatment plant, and belongs to the technical field of solid waste comprehensive utilization. Background technique [0002] In the process of collecting and treating urban sewage, a large amount of sludge will inevitably be produced (according to statistics, the amount of dry sludge produced in the world may reach 100 million tons a year). The strengthening and improvement of environmental quality requirements make more and more waste water need to be treated. By the end of 2002, there were 537 urban sewage treatment plants nationwide, with a treatment capacity of 13 billion tons. Calculated with a moisture content of 80%, 13 million t / a of dewatered sludge can be produced. According to China's national economic development plan and urban sewage treatment planning in water pollution prevention and control planning: by 2010, the discharge of urban sludge will reach m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/12
Inventor 赵由才宋玉汪宝英万琦甄广印曹先艳
Owner SHANGHAI TONGJI CONSTR CO LTD
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