A method for preparing foam liquid and porous ceramic filter material from surplus sludge

Abstract

The invention discloses a method for preparing foam liquid for foam concrete and porous ceramic filtering material with a heavy metal adsorption function for water treatment by utilizing residual sludge. The invention relates to comprehensive utilization of the residual sludge and preparation of a water treatment material. The method comprises the following steps of: (1) taking fresh residual sludge, adding sulfuric acid solution and nano-calcium titanate powder, performing a stirring reaction, then adding diatomite, performing a heating reaction, and carrying out solid-liquid separation to obtain liquid A and solid A; (2) adding sodium hydroxide solution into the solid A, performing a heating reaction, carrying out solid-liquid separation to obtain liquid B and solid B, mixing the liquid A and the liquid B, regulating a pH value to 5 to 8, and carrying out solid-liquid separation to obtain solid C and the foam liquid; (3) carrying out ball-milling on the solid B and the solid C, and carrying out mixing, forming, drying and calcining to obtain a porous ceramic material which can be used as a heavy metal adsorbent or the ceramic filtering material with the heavy metal adsorption function. The method is simple in process and high in stability; when the residual sludge is processed and utilized, the foam liquid and the ceramic filtering material are obtained; the method is low in cost, has no secondary pollution and has excellent economic benefits and environmental benefits.

Description

technical field [0001] The invention belongs to the field of environmental technology and building materials, and in particular relates to a method for preparing foam liquid for foam concrete and porous ceramic filter material with the function of absorbing heavy metals by using excess sludge. [0002] technical background [0003] Sewage treatment plants will produce a large amount of excess sludge while biochemically treating wastewater. The sludge contains a large amount of toxic and harmful substances, which must be treated and disposed of in a timely manner. At present, the treatment and disposal methods of excess sludge mainly include landfill, incineration and composting. The landfill method requires a large amount of land, and there are also potential safety hazards; the incineration method consumes a lot of energy and easily produces harmful waste gases such as dioxins; and the harmful substances in the sludge cannot be completely removed during composting, and these...

AI Technical Summary

Problems solved by technology

These ceramsite filter materials and firing materials all use non-renewable resources such as clay as binders; although sludge ceramsite filter materials can use part of the sludge, the amount of added sludge is limited

At the same time, in the practical process of water treatment, heavy metals and organic matter coexist in wastewater in many cases. Although biochemical methods can remove organic matter well, the treatment capacity for heavy metals is limited. Functional ceramic filter material can solve this problem

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