Facilities for 2nd level treatment of hospital wastewater include biological treatment facilities for removal of organic substances and a part of nutrients. removes organic substances and a part of nutrients 3rd level treatment removes nutrients and disinfection. Sludge of hospital wastewater treatment plant shall be stabilized, eliminated pathogens prior to off-site transportation. Sludge can be dried in area of hospital wastewater treatment plant. Table 9: Options of technology applicable to hospital wastewater treatment Treatment facility Technological options Simple septic tank Septic tank Baffled septic tank Baffled septic tank with anaerobic filter Bar or fine screen for waste removal Waste removal Mechanically operated screen for waste removal Attached Trickling biological filter growth Submerged biological filter biological Rotating biological contactor treatment Mixed aeration tank Biological Aerated-Lagoon reactors growth treatment in Sequencing batch reactor aerobic or biological Oxidation ditch anaerobic condition treatment Anaerobic - Anoxic - Oxic nutrient (AAO) removal AOAO Other nutrient removal processes Biological Constructed wetland treatment in natural Anaerobic or aerobic or facultative Bio-lake condition Chlorine disinfection Disinfection Ultraviolet disinfection Ozone disinfection Sludge compressing tank Sludge treatment tank Sludge drying facility A hospital wastewater treatment can apply single option or many options of biological treatment, provided that the effluent meet Vietnamese standard TCVN 7382:2004 and the plant is suitable to hospital’s circumstance. 10 Choice of wastewater treatment level by requirements Level of treatment Suspended BOD5 Nitrogen and substances (mg/l) phosphorus (mg/l) 1st level treatment 80 - - 2nd level treatment 25– 80 -
Facilities for 2nd level treatment of hospital wastewater include biological treatment facilities for removal of organic substances and a part of nutrients. removes organic substances and a part of nutrients 3rd level treatment removes nutrients and disinfection. Sludge of hospital wastewater treatment plant shall be stabilized, eliminated pathogens prior to off-site transportation. Sludge can be dried in area of hospital wastewater treatment plant. Table 9: Options of technology applicable to hospital wastewater treatment Treatment facility Technological options Septic tank Simple septic tank Baffled septic tank Baffled septic tank with anaerobic filter Waste removal Bar or fine screen for waste removal Mechanically operated screen for waste removal Biological treatment in aerobic or anaerobic condition Attached growth biological treatment Trickling biological filter Submerged biological filter Rotating biological contactor growth biological treatment Mixed aeration tank Aerated-Lagoon reactors Sequencing batch reactor Oxidation ditch nutrient removal Anaerobic - Anoxic - Oxic (AAO) AOAO Other nutrient removal processes Biological treatment in natural condition Constructed wetland Anaerobic or aerobic or facultative Bio-lake Disinfection Chlorine disinfection Ultraviolet disinfection Ozone disinfection Sludge treatment Sludge compressing tank tank Sludge drying facility A hospital wastewater treatment can apply single option or many options of biological treatment, provided that the effluent meet Vietnamese standard TCVN 7382:2004 and the plant is suitable to hospital’s circumstance. 10 Choice of wastewater treatment level by requirements Level of treatment Suspended substances (mg/l) BOD5 (mg/l) Nitrogen and phosphorus 1st level treatment 80 - - 2nd level treatment 25– 80 -
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