Sludge-based biochar and preparation method and application thereof, and acetic acid modified sludge-based biochar and preparation method and application thereof
A biochar and sludge technology, applied in chemical instruments and methods, radioactive purification, other chemical processes, etc., can solve the problems of odor treatment cost, easy corruption of surplus sludge, and large land resources, and achieve low cost, Easy industrial application, fast processing effect
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[0028] The invention provides a method for preparing sludge-based biochar, comprising the following steps: using an activator solution to first impregnate and activate dehydrated excess sludge, and then sequentially perform drying, roasting and acid leaching to obtain sludge-based biochar .
[0029] In the present invention, the source of the dewatered excess sludge is preferably excess sludge obtained from sewage treatment in a sewage treatment plant. In the present invention, the excess sludge is preferably dehydrated, dried and crushed to obtain dehydrated excess sludge. In the present invention, the dehydration and drying temperature is preferably 80-110°C, more preferably 90-100°C, and most preferably 105°C; the present invention has no special limitation on the dehydration and drying time, and can ensure that the dehydration The moisture content of the excess sludge can be 10-30%, specifically such as dehydration and drying for 12-24 hours. In the present invention, th...
Embodiment 1
[0049] Dry the excess sludge after dehydration from the sewage treatment plant at 105°C for 24 hours, pass through a 120-mesh sieve after grinding, and obtain the dehydrated excess sludge;
[0050] Mix the obtained dehydrated excess sludge with 3mol / L KOH solution at a mass ratio of 1:1.5, soak and activate at room temperature for 24 hours to obtain activated sludge;
[0051] Drying the activated sludge at 80°C until the water content is 60% to obtain dried activated sludge;
[0052] The dry activated sludge is placed in a quartz boat, the quartz boat is placed in a muffle furnace, the temperature of the muffle furnace is raised to 350°C at a heating rate of 5°C / min, and roasted under nitrogen for 40min; The charcoal is ground and passed through a 120-mesh sieve; the ground biochar is washed several times with acetone, and then washed with distilled water at 75°C until the washing solution is neutral to obtain crude biochar;
[0053] The crude biochar was soaked in hydrochlor...
Embodiment 2～28
[0055] The sludge-based biochar was prepared according to the method of Example 1, and the experimental conditions of Examples 1-28 are shown in Table 1.
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