Sludge treatment method and sludge foaming lightweight concrete produced therefrom and use

Abstract

The invention discloses a sludge treatment method, as well as sludge foamed lightweight concrete produced through the method and application thereof. In the method, sludge produced by sewage treatment first reacts with quicklime so as to form sludge hydrated lime; then the sludge hydrated lime is mixed with cement and water so as to form sludge concrete; foaming agent produces foam by utilizing a foaming system of a foaming machine; and the foam is mixed with the sludge concrete. The sludge treatment method can directly obtain the sludge foamed lightweight concrete. The sludge foamed lightweight concrete has a plurality of functions, which can be used as a filling material, a heat insulating material, a walling material, a sound insulation material, a mine tunnel filling material, an artificial landscape manufacturing material, a road recovery material, a pipe base filling material and the like. The sludge treatment method is low in cost and friendly to environment, can directly produce the sludge foamed lightweight concrete with a plurality of functions, and not only solves the sludge treatment problems in the sewage treatment industry, but also ensures the full utilization of the sludge.

Description

technical field [0001] The present invention relates to a method for treating and recycling sludge and the products produced by the method and its application. Specifically, the present invention relates to a method for producing lightweight foamed concrete from sludge produced by sewage treatment and using the The lightweight foamed concrete produced by the method and the application of the lightweight foamed concrete. Background technique [0002] Sewage treatment is the process of concentrating impurities in sewage into a semi-solid form and then separating them from the fluid. The separated paste concentrate is sludge. Sludge treatment has always been a difficult problem in the sewage treatment industry. Sludge treatment equipment accounts for about 40%-60% of the infrastructure investment of sewage treatment plants, and about 50% of the cost of sewage treatment plants is sludge treatment costs. [0003] The traditional sludge treatment method is to firstly dehydrate an...

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Problems solved by technology

Such treatment method has the following disadvantages and difficulties: (1) because the sludge is pasty, and the moisture content of the original sludge is as high as more than 95%, multiple dehydration and drying must be carried out, requiring expensive dehydration and drying equipment and huge Energy consumption, and requires a huge treatment site; (2) Incineration of sludge will seriously pollute the air; (3) Because the sludge contains a variety of heavy metals and other toxic and harmful substances, after landfill, these heavy metals and toxic and harmful substances will seep into (4) The dehydrated and dried sludge is incinerated and landfilled as waste, which not only fails to recycle the sludge, but also causes huge dehydration, drying, incineration, landfill and other costs and expenses Undoubtedly a serious waste

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