| dc.description.abstract | This study was carried out to inspect the suitability of 5 methods to produce
phosphorus-based products using sewage sludge as an alternative to the rock
phosphate demand to produce phosphate fertilizers. The considered methods are
supercritical water gasification of sewage sludge, struvite precipitation,
thermochemical treatment of sewage sludge, wet chemical treatment of sewage
sludge and electro dialysis of sewage sludge. These methods are compared with
each other to determine best method using 11 different criteria selected in Sri
Lankan context. The comparison was carried out using a multi-criteria decision
making (MCDM) technique called TOPSIS under 3 different scenarios which
assigned different values to the criteria in environmental, economic and fertilizer
suitability aspects. An analysis was carried out regarding results of the MCDM to
determine the best method, and struvite precipitation was selected as the best
method in Sri Lankan context to recover the phosphorus in wastewater. | en_US |
