Method for preparing activated carbon through sludge fermentation residues

Abstract

The invention relates to a method for preparing activated carbon through sludge fermentation residues. The method comprises the following steps of 1, mixed strong base pretreatment on sludge, whereinthe remaining sludge is taken, the moisture content of the sludge is adjusted to be 95-98%, a mixed solution of potassium hydroxide and sodium hydroxide is added, and the sludge is subjected to mixedstrong base pretreatment after being heated to 90-95 DEG C; 2, sludge and water separation for a fermentation mixture, wherein the remaining sludge after strong base pretreatment in step 1 is subjected to anaerobic fermentation, and when fermentation is finished, agricultural and forest waste is put in the fermentation mixture to serve as a filter aid; 3, preparation of the activated carbon through the fermentation residues, wherein the fermentation residues after sludge and water separation in step 2 are slowly dried under a low-temperature condition, the dried residues are sent into a carbonizing furnace for high-temperature carbonizing, the carbonized residues are sent to an activator for pelleting activation, the activated residues are sent to an oven for drying, and after drying is finished, the sludge-based activated carbon is obtained. By means of the method, the situation that the agricultural and forest waste is left unused and wasted is reduced, and the problem that it is hard to dispose anaerobic fermentation sludge is solved.

Description

technical field [0001] The invention relates to a method for preparing activated carbon, in particular to a method for preparing activated carbon by using sludge fermentation residue, and belongs to the field of solid waste recycling. Background technique [0002] Surplus sludge is an inevitable by-product of sewage treatment. With the continuous improvement of my country's sewage treatment rate, sludge production has increased year by year. At this stage, my country's annual surplus sludge production has exceeded 50 million tons. The reduction of sludge and resources Globalization has become a difficult problem facing my country's environmental protection industry. Using excess sludge for anaerobic fermentation and converting the rich organic matter in the sludge into high value-added volatile fatty acids (VFAs) is an effective way to recycle sludge. However, it is difficult to separate the sludge from the anaerobic fermentation sludge. , the sludge residue after fermentati...

AI Technical Summary

Problems solved by technology

In the existing research on the preparation of activated carbon from sludge, most of them use dehydrated sludge as raw material and prepare it by adding agricultural and forestry wastes with high carbon content for activation and modification, but no alkaline anaerobic fermentation A technical method for preparing sludge-based activated carbon from the final sludge residue