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A preparation method of sludge biochar permeable brick with high adsorption performance
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A biochar, high adsorption technology, applied in adsorption water/sewage treatment, water/sludge/sewage treatment, sludge detoxification, etc. The problem of low sludge utilization rate, etc., achieves the effect of strong adsorption capacity, not easy to break and loss, and prevention and control of groundwater pollution
Active Publication Date: 2020-01-21
HENAN INST OF ENG
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[0006] In view of the above situation, in order to solve the defects of the prior art, the purpose of the present invention is to provide a preparation method of sludge biochar permeable bricks with high adsorption performance, which can effectively solve the problem of sludge production of conventional building bricks and single bricks. The sludge content is low, and the sludge utilization rate is low; at the same time, due to the high moisture content and organic matter content in the sludge, the strength of using sludge alone or sludge biochar to make bricks is not enough, and it is difficult to meet the needs.
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Embodiment 1
[0028] 1) After dehydration treatment of urban sewage treatment plant sludge or water dredging sludge, add 0.05mol / L ethylenediaminetetraacetic acid solution and 0.1mol / L humic acid solution, and the amount of eluent per 1kg of sludge is 2L , to remove some heavy metals by leaching;
[0029] 2) Plate and frame press filter the sludge treated with leaching agent, then add fly ash or blast furnace slag, and mix according to the mass ratio of sludge: fly ash or blast furnace slag at a ratio of 15:1;
[0030] 3) Granulation and drying, made into granules with a particle size of 5mm, air-dried naturally, or dried in a dryer, and the moisture content is reduced to below 10%;
[0031] 4) Place the dried material in step 3) in a pyrolysis device, raise the temperature to 600°C under anaerobic conditions, and after firing for 4 hours, cool down to 27°C to obtain sludge biochar;
[0032] 5) Take waste fabric according to 2% of the volume of 7mm crushed stone aggregate, and cut it into ...
Embodiment example 2
[0039] Implementation case 2, the preparation of permeable bricks for water body slopes. The main function of this type of permeable bricks is water purification and exchange, and does not need to have high strength. Therefore, the proportion of biochar can be increased to about 33.33% when installing the mold, and the mold should be installed according to the ratio of biochar: concrete = 1:2, and the thickness of the concrete layer on the brick surface can be reduced to 1cm.
[0040] The addition of waste fabrics in the present invention can make the connection between sludge biochar particles more tightly, improve the strength of sludge biochar bricks, and reduce the crushing and loss of sludge biochar. The purpose of plate and frame filter press is to Heavy metals activated by leaching agent or chelated are removed from the sludge. The concrete material made of crushed stone aggregate, strip fabric and cement ensures the pressure resistance and strength of the permeable bric...
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Abstract
The invention relates to a preparation method of a sludge biocharcoal water permeable brick with high adsorption performance, which can effectively solve the problems of the conventional building brick produced by sludge that the sludge content of the single brick is low, the sludge utilization rate is low, and the strength of the brick produced independently by sludge or sludge biochaircoal is insufficient. According to a technical scheme, the preparation method comprises the following steps: after dewatered sludge is rinsed to remove partial heavy metal, the dewatered sludge is press filtered by virtue of a plate frame, then coal ash or blast furnace slag is added and uniformly mixed, after being granulated and dried, the mixture is pyrolysed at a high temperature to obtain the sludge biocharcoal, crushed stone aggregates are mixed with processed waste fabric, the stirred concrete and the biocharcoal are loaded into a mold together and then pressurized, molded, demolded and maintained, thus obtaining the sludge biocharchaol water permeable brick. The biochaircoal water permeable brick prepared by the method of the invention can prevent heavy metal nitrogen, phosphorus, organic pollutants and the like in direct surface runoff from being migrated into underground water and from polluting the underground water, and the method is an innovation for synergistic treatment and recycling of waste.
Description
technical field [0001] The invention relates to the technical field of preparation of permeable bricks, in particular to a method for preparing sludge biochar permeable bricks with high adsorption performance. Background technique [0002] The amount of sludge produced by my country's sewage treatment plants is about 30 million tons per day, and a large amount of sludge will also be produced during the treatment of black and odorous water bodies. Because of its high water content and high heavy metal content, its safe disposal is a huge problem . [0003] Biochar is a product of biomass pyrolysis under high temperature conditions. It has a porous structure and a stable carbon source with specific functional groups. It has a strong adsorption capacity for most pollutants. It is generally used as an adsorbent, sewage treatment and soil remediation material. [0004] Permeable brick is a commonly used material in the process of black and odorous water treatment and sponge city ...
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