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

A technology of excess sludge and porous ceramics is applied in the field of environmental technology and building materials, which can solve the problems of limited sludge volume and limited heavy metal processing capacity, and achieve the effects of low cost, good economic and environmental benefits, and simple process.

Active Publication Date: 2021-03-16
芽米科技(广州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A method for preparing foam liquid and porous ceramic filter material from excess sludge is to take 2000g of fresh excess sludge with a water content of 82%, add 2000g of 0.2mol / L sulfuric acid solution and 100g of nanometer calcium titanate powder solid, stirred and reacted for 30 minutes, then added 400g of diatomaceous earth, stirred evenly, heated to keep a slight boiling reaction for 20 minutes, cooled to room temperature, left to react for 12 hours, and filtered with suction to obtain liquid A and solid A; (2) the solid Wash A with water until it is neutral, add a sodium hydroxide solution equal to the mass of solid A with a concentration of 0.2 mol / L, mix well, heat and keep a slight boil for 30 minutes, cool to room temperature, and filter with suction to obtain liquid B and solid B, and liquid A Mix with liquid B, stir and react completely, adjust the pH value to 6 with sulfuric acid solution and sodium hydroxide solution, let it stand for 12 hours, and filter w...

Embodiment 2

[0019] A kind of method that utilizes excess sludge to prepare foam liquid and porous ceramic filter material is to take fresh excess sludge with a moisture content of 82% 2000g, add 2000g of 0.2mol / L sulfuric acid solution and 20g of nanometer calcium titanate powder solid, stirred for 20 minutes, then added 200g of diatomaceous earth, stirred evenly, heated to keep a slight boiling reaction for 15 minutes, cooled to room temperature, left to react for 12 hours, and filtered to obtain liquid A and solid A; (2) the solid Wash A with water to neutrality, add a 0.2 mol / L sodium hydroxide solution with the same mass as solid A, mix well, heat and keep boiling slightly for 60 minutes, cool to room temperature, and suction filter to obtain liquid B and solid B, and dissolve the liquid Mix A and liquid B, stir and react completely, adjust the pH value to 7 with sulfuric acid solution and sodium hydroxide solution, and after standing for 12 hours, filter with suction to obtain solid C...

Embodiment 3

[0021] A kind of method that utilizes excess sludge to prepare foam liquid and porous ceramic filter material is to take fresh excess sludge with a moisture content of 82% 2000g, add 2000g of 0.2mol / L sulfuric acid solution and 20g of nanometer calcium titanate powder solid, stirred and reacted for 60 minutes, then added 1000g of diatomaceous earth, stirred evenly, heated to keep a slight boiling reaction for 60 minutes, cooled to room temperature, left to react for 12 hours, and filtered to obtain liquid A and solid A; (2) the solid Wash A with water until it is neutral, add 1.2 times the mass of solid A in a sodium hydroxide solution with a concentration of 0.2mol / L, mix well, heat and keep boiling slightly for 15 minutes, cool to room temperature, and suction filter to obtain liquid B and solid B. Mix A and liquid B, stir and react completely, adjust the pH value to 6 with sulfuric acid solution and sodium hydroxide solution, and after standing for 12 hours, filter with suct...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/02C04B38/10C04B38/08C04B33/132C04B33/13C04B28/00
CPCB01J20/02C04B28/00C04B33/131C04B33/1321C04B38/08C04B38/106C04B2111/40C04B2201/20C04B2201/32C04B2201/50C04B2235/3236C04B2235/6562C04B2235/6567C04B2235/661C04B2235/77C04B2235/96C04B2235/9607C04B38/0074C04B38/009C04B16/0633C04B22/068C04B38/02C04B38/0067Y02P40/60
Inventor 张东李艳陈伟张思宇
Owner 芽米科技(广州)有限公司
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