A preparation method of sludge biochar permeable brick with high adsorption performance
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
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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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