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In the process of construction and development, Ho Chi Minh City is discharging about six types of sludge: 1) sludge from urban wastewater drainage systems; 2) sludge from industrial wastewater drainage system; 3) sludge from the canal dredging activities periodically; 4) sludge from septic tanks; 5) sludge from the water treatment station/plant; 6) sludge from the construction sites. Sludge's components are very different among types of sludge, sludge from the sewer network and canal dredgingdoi:10.4236/jep.2013.412154 fatcat:sknrir2bhvbndbgjroz3hnkaii