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Method for treating dehydrated sludge of domestic sewage treatment plant

A technology for dewatering sludge and domestic sewage, applied in water/sludge/sewage treatment, sludge treatment, chemical instruments and methods, etc. High problems, to achieve the effects of low capital investment and treatment costs, short curing time, and simple curing process

Inactive Publication Date: 2008-09-03
上海明诺环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the curing agent is cement, lime, etc., the curing time is as long as 5 to 6 days; in addition, the addition of a large amount of curing agent leads to high alkalinity of the solidified body, which affects the soil quality in the landfill area; there is also dust during operation Big, big secondary pollution

Method used

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  • Method for treating dehydrated sludge of domestic sewage treatment plant
  • Method for treating dehydrated sludge of domestic sewage treatment plant

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Sludge solidification treatment in a large domestic waste landfill in Shanghai.

[0021] The dewatered sludge comes from a domestic sewage treatment plant in Shanghai, with a moisture content of 73.3% and a compressive strength of 8.3kPa.

[0022] The composition and weight percentage of curing agent are: MgO is 80%, MgCl 2 20%. MgO is industrial-grade light or heavy magnesium oxide powder, with an effective content of 75%; MgCl 2 For industrial grade, the effective content is 46%. Mix the curing agent in the storage tank, and then enter the powder silo for use.

[0023] The dewatered sludge is stored in the sludge storage tank, and then the dewatered sludge measured in the above ratio is sent into the waiting bin by a hoist according to dewatered sludge: curing agent = 95%: 5% by weight. Add the curing agent in the powder silo to the dewatered sludge. Then mix and stir the dewatered sludge and curing agent for 3 minutes in a mixing mixer, and then discharge the ma...

Embodiment 2

[0025] In addition to the composition and weight percentage of the curing agent: MgO is 85%, MgCl 2 15%; Dewatered sludge: solidifying agent=92%: except 8% weight percentage, all the other are identical with embodiment 1. The properties of the solidified sludge are listed in Table 1.

Embodiment 3

[0027] In addition to the composition and weight percentage of the curing agent: MgO is 75%, MgCl 2 25%; Dewatered sludge: curing agent=88%: except 12% by weight, all the other are identical with embodiment 1. The properties of the solidified sludge are listed in Table 1.

[0028] Table 1 Properties of solidified sludge

[0029]

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Abstract

The invention relates to a method for treating dewatered sludge in a domestic sewage treatment plant. The water ratio of the dewatered sludge is not more than 80 percent. MgO and MgCl2 are taken as curing agents. The usage amount can be taken according to the weight percentage, namely, MgO: MgCl2=(75 per cent-85 per cent):(15 per cent- 25 per cent); then, the curing agents are added into the dewatered sludge, the adding amounts of the curing agents are taken according to the weight percentage of the dewatered sludge and the curing agent, namely, the dewatered sludge: the curing agents=(92 per cent-95 per cent):(5 per cent-8 per cent); then the dewatered sludge is evenly mixed with the curing agents and blended, and maintains for one to two days, and the solidified sludge with the water ratio lower than 60 percent is obtained and conforms to the Standard for Pollution Control on the Landfill Site of Municipal Solid Waste (GB16889-2008) of the land fill disposal; finally, the solidified sludge undergoes the land fill disposal. The invention has the advantages of simple process, convenient operation and low cost; the solidified sludge has good impermeability, leach resistance, dryness and wetness resistance, freeze-thaw resistance and sufficient mechanical strength; the invention can perform stabilization, quantity-reducing and harmlessness treatment to the dewatered sludge, and is convenient for the realization of the sludge recycling.

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). With the strengthening and improvement of environmental quality requirements, more and more wastewater needs to be treated. By the end of 2002, there were 537 urban sewage treatment plants nationwide, with a treatment capacity of 13 billion. Calculated with a moisture content of 80%, 13 million t / a of dewatered sludge can be produced. According to the urban sewage treatment plan in China's national economic development plan and water pollution prevention plan: by 2010, the discharge of urban sludge will reach more than 12 million ...

Claims

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Application Information

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IPC IPC(8): C02F11/00
Inventor 宋玉马建立王海峰章明
Owner 上海明诺环境科技有限公司
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