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Harmless mud processing method for sewage treatment plant

A harmless treatment and sewage treatment plant technology, applied in the direction of dehydration/drying/concentrated sludge treatment, etc., can solve the problems of high energy consumption, secondary pollution, high cost, land occupation, etc., and achieve the purpose of inhibiting bacterial reproduction and even death, Increased mechanical strength, good for growth

Inactive Publication Date: 2012-12-12
湖北中科博策新材料研究院
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although incineration has a good effect on the reduction and stability of sludge, it has problems such as large energy consumption and serious secondary pollution; and the toxic substances and metal ions in the sludge after landfill not only occupy a large area of ​​land, but also cost a lot of money. High, and caused a large area of ​​environmental pollution

Method used

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  • Harmless mud processing method for sewage treatment plant
  • Harmless mud processing method for sewage treatment plant
  • Harmless mud processing method for sewage treatment plant

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Experimental program
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Effect test

Embodiment 1

[0019] 1. Prepare cementitious material, the steps are as follows:

[0020] (1) The weight percentage of building material components is: 50-80% of fluorogypsum, 5%-20% of cement clinker, 5-15% of alkaline ash, 10-20% of water-quenched slag, 5-15% of fly ash, 0.5-3% coagulant; the sum of the weight percentages of the above components is 100%;

[0021] (2) Neutralize the tailings of the AHF reaction process - fluorogypsum to pH > 7, and send it to the silo as the main raw material for standby;

[0022] (3) Cement clinker, alkaline ash, water-quenched slag, and fly ash are sent to the silo for standby;

[0023] (4) Put the above-mentioned raw materials into the hot air drying device according to the ratio through the automatic metering screw to remove the surface water and enter the mixing bin;

[0024] (5) After drying, the mixture enters the grinder and grinds to a fineness > 200 mesh;

[0025] (6) Add a coagulant to the ground mixture, enter the powder mixer and mix evenly...

Embodiment 2

[0042] A method for harmless treatment of sludge in a sewage treatment plant, the steps of which are as follows: adding water-retaining materials to the original sludge to reduce the water content of the sludge to below 65%, and then adding cementing materials externally, under normal temperature and pressure Mix evenly and air dry naturally.

[0043] The mass ratio of the three when mixed is sludge (water content 95%): cementing material: water-retaining material = 100:15-30:0.05.

[0044] The water-retaining material is a high-magnification water-absorbing resin provided by Wuhan Yuancheng Gongchuang Technology Co., Ltd.

[0045] The cementing material is mainly made of industrial fluorine gypsum, supplemented by cement clinker, metallurgical industry alkaline ash, water quenching slag, power industry fly ash, coagulation accelerator and the like. The weight percentage of each component of the cementing material is: 50% fluorogypsum; 10% cement clinker, 12% alkaline ash; 15% ...

Embodiment 3

[0054] The harmless treatment method for sludge in sewage treatment plants, the steps are as follows: add water-retaining materials to the original sludge to reduce the water content of the sludge to less than 65%, then add cementing materials, and mix uniformly under normal temperature and pressure. Stir and dry naturally;

[0055] The mass ratio of the three when mixed is sludge (water content 70%): cementing material: water-retaining material = 100:15-30:0.01.

[0056] The water-retaining materials are polyacrylates and vinyl acetate copolymers.

[0057] The cementing material is mainly made of industrial gypsum, supplemented by cement clinker, metallurgical industry alkaline ash, water quenching slag, power industry fly ash, coagulation accelerator and the like. The weight percentage of each component of the cementing material is: 73.5% of phosphogypsum, 5% of cement clinker, 6% of alkaline ash, 10% of water quenching slag, 5% of fly ash, and 0.5% of coagulant. Described...

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Abstract

Disclosed is a harmless mud processing method for a sewage treatment plant. The method comprises that a water retention material is added based on primary mud, the water content of a mud sample is lowered to below 65%, the a cementitious material is added and mixed, the mixture is stirred and mixed evenly and air dried naturally under normal temperature and pressure, and during mixing, the quality ratio of the mud, the cementitious material and the water retention material is 100:(15-30):(0.01-0.05). The method has the advantages that after the mud is processed, the obtained modified material coats harmful bacteria and noxious heavy metals in the mud, such as chromium, lead and mercury, some industrial gypsum such as fluorine gypsum, phosphorus gypsum, titanium dioxide gypsum and desulfurized gypsum has rich malysite, the industrial gypsum and noxious metal elements are subjected to oxidation reaction or reduction reaction, then the toxicity of the mud is reduced, the noxious metal elements can be converted to metal elements with an innoxious valence state, the cementitious material is in the alkali environment, some metals are subjected to complexation easily, indissoluble subsulfate can be produced, and simultaneously, growth and propagation of bacterium can be inhibited effectively under alkali environment.

Description

technical field [0001] The invention relates to the technical field of waste treatment, in particular to a harmless treatment method for sludge in a sewage treatment plant, which is especially suitable for sludge including residual toxic heavy metals and bacteria after treatment of domestic sewage and industrial sewage. Background technique [0002] An important source of urban environmental problems is domestic and industrial wastewater, and the sludge left after sewage treatment has become a major hidden danger to the urban environment. Sludge belongs to solid waste. According to the Law of the People's Republic of China on the Prevention and Control of Environmental Pollution by Solid Waste: Based on the principle of making full use of solid waste and harmless disposal of solid waste, encourage and support the development of clean production and reduce the generation of solid waste Encourage and support the comprehensive utilization of resources, fully utilize, recycle an...

Claims

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Application Information

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IPC IPC(8): C02F11/14
Inventor 黄澄华叶旭李菁吴荣陈雪娟
Owner 湖北中科博策新材料研究院
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