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2. Wastewater? From waste to resource,2020
3. Wastewater engineering: treatment and resource recovery;Tchobanoglous,2014
4. The future distribution and production of global phosphate rock reserves;Cooper;Resour Conserv Recycl,2011
5. National water quality standards for Malaysia parameter Source : EQR2006 national water quality standards for Malaysia;Department of Environment of Malaysia,2014