Selected maturity properties of composts obtained from all three treatments (dry weight basis) (mean ± standard deviation): Dewatered fresh sewage sludge þ wheat straw (DFSS þ WS or Control), Dewatered fresh sewage sludge þ wheat straw þ lime (DFSS þ WS þ L), Dewatered fresh sewage sludge þ wheat straw þ lime þ biochar (DFSS þ WS þ L þ B).