Preparation of the KOH-modified Sludge Biochar by Pyrolysis and Adsorption of Eutrophic Water
ZHOU Shufeng
CHEN Chengguang
LIU Yunchu
HU Yi
HU Baowei
Abstract：Biochars were prepared with excess sludge by pyrolysis at hypoxia.The effects of KOH-modified method,pyrolysis temperature and duration on production of sludge biochars were investigated,and adsorption of NH4+-N,PO43--P,COD in simulated eutrophic water by sludge biochars were further discussed.The results showed that by increasing the pyrolysis temperature (over the range from 400 ℃ to 800 ℃) or duration (over the range from 2 hours to 4 hours) the specific surface area of biochars increased,but the pore size decreased.Co-pyrolysis of sludge-KOH was adverse to improving the physicochemical properties of biochars.The amounts of NH4+-N and PO43--P absorbed by sludge biochars which prepared at 600 ℃ was proportional to the adsorption time.It was found that KOH-modified sludge biochars could not absorb NH4+-N in simulated eutrophic water effectively,however,biochars which were prepared by co-pyrolysis of sludgeKOH absorbed PO43--P well.Moreover,the optimum adsorption time for adsorbing COD by eight kinds of biochars basically was3 h.
Keywords：sludgeKOH-modifiedbiocharadsorptioneutrophic water
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 43-49 )