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\hypersetup{pdftitle={Soil Rehabilitation Potential of Co"=Compost Pellets Made from Municipal Solid Waste and Dewatered Faecal Sludge as Feedstock },pdfauthor={AWS Pushpa Kumara, Felix Thiel, Jayantha Weerakkody, Bandula Ranaweera},pdfsubject={Tropentag 2018: Abstract},pdfkeywords={Biochar, co-compost, dewatered faecal sludge, municipal solid waste},pdfpagemode=None,colorlinks=true}
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\parbox[b]{13.4cm}{\centering \large{\textbf{Tropentag, September 17-19, 2018, Ghent}}\\[1ex] \Large{``Global food security and food safety:\\The role of universities''\\[2ex]}}
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\Large{\textbf{Soil Rehabilitation Potential of Co"=Compost Pellets Made from Municipal Solid Waste and Dewatered Faecal Sludge as Feedstock \footnote{\textbf{Contact Address:} Felix Thiel, Ruhr University Bochum / International Water Management Institute, Inst. of Geography / Rural Urban Linkages, Universitäts str 150, 11222~Bochum, Germany, \mbox{e-mail}: \email{leifgrau@gmail.com}}\\[0.8ex]}}
\normalsize{\textsc{AWS Pushpa Kumara$^{1}$, Felix Thiel$^{2}$, Jayantha Weerakkody$^{1}$, Bandula Ranaweera$^{1}$}}
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\begin{itemize*}
\item[]{\small{\textit{$^{1}$Wayamba University of Sri Lanka, Fac. of Agriculture and Plantation Management, Sri Lanka}}}
\item[]{\small{\textit{$^{2}$Ruhr University Bochum / International Water Management Institute, Inst. of Geography / Rural Urban Linkages, Germany}}}
\end{itemize*}
\index[author]{Pushpa Kumara, AWS}
\index[author]{Thiel, Felix}
\index[author]{Weerakkody, Jayantha}
\index[author]{Ranaweera, Bandula}
\begin{center}
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\textbf{Abstract}
\begin{abstract}
\normalsize{
Solid waste management challenges are felt most keenly in the developing countries as a major consequence of development and modernisation. Sri Lanka as a developing country faces severe issues in managing the daily generated liquid and solid waste. Organic fractions of these waste takes a higher percentage. The organic portions of municipal solid waste (MSW) and co"=composting of dewatered faecal sludge (DFS) is a feasible low"=cost technology which enhances sanitation and waste management. The aim of this research was to evaluate the effect of MSW and DFS co"=compost pellets produced with the addition of mineral fertiliser and biochar on soil chemical and biological properties. Trapezoidal windrow type co"=compost piles were prepared with 18m$^{3}$ volume and \mbox{70\,\%} MSW and \mbox{30\,\%} DFS. Temperature measurements, watering and turning were done as necessary. Weekly samples were collected for chemical analysis. Resulted co"=compost was mechanically pelletized using biochar and mineral fertiliser as additives and used in maize cultivation. 
The experiment was arranged as randomised complete block design using 7 treatments. Soil samples were collected from \mbox{30\,cm} and \mbox{60\,cm} depths to evaluate chemical and biological properties. There was a significant increase in pH values between control treatment (mineral fertiliser) and MWS-DFS co"=compost treatments. The treatment with DFS-MSW-Biochar had the highest EC and organic carbon value suggesting that biochar has the ability to increase EC in soil and act as a carbon sequester. MSW-DFS co"=compost treatments had the highest phosphorous and potassium values. Soil microbial activity was not significantly changed with the application of co"=compost. Further, temperature changes during the co"=composting process, was different from normal composting process, which may be resulted in a variation in feedstock characters. These results conclude that co"=compost help to improve soil pH, EC, organic carbon, phosphorous and potassium with compared to the mineral fertiliser application. Hence, co"=compost produced from MSW and DFS can potentially be used in soil rehabilitation while co"=compost enriched with biochar act as a soil amendment.}

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\noindent \textbf{Keywords:} Biochar, co"=compost, dewatered faecal sludge, municipal solid waste
\index[key]{Biochar}
\index[key]{Co"=compost}
\index[key]{Dewatered faecal sludge}
\index[key]{Municipal solid waste}
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