AI SearchAssessment and control of wastewater in meat factories and slaughterhouses
Call Number: AIT Thesis no. EV-91-10 Material type:
SeriesSeries: Asian Institute of Technology. Thesis ; no. EV-91-10Publication details: Bangkok : Asian Institute of Technology, 1991Description: 114 pSubject(s): Online resources: Dissertation note: Thesis (M.Eng.) - Asian Institute of Technology, 1991 Summary: The wastewater quantity, wastewater characteristics, its treatability and pollution load from slaughterhouses were studied. All measurements and analyses were conducted at a Bangkok (Thailand) slaughterhouse. The data collected from VISSAN (a slaughterhouse in Ho Chi Minh City, Vietnam) were analyzed for comparison. In comparison to European data wastewater in both these case studies was of a higher amount (in VISSAN 900 m3/d and in Bangkok slaughterhouse 1660 m3/d) and with more diluted characteristics (CODm = 1200 - 1500 mg/l in VISSAN and 650 - 873 mg/l in the Bangkok slaughterhouse) due to high water consumption and in the Bangkok slaughterhouse also due to much infiltration water. The total waste materials discharged from the slaughtering process into WW streams found by setting up materials balance were relatively high: In Bangkok case study: In VISSAN: Hog 1.3-2.1 kg/head (13.1-20 .5 kg/TLW) Cattle: 4.8-8.8 kg/head (10.5-17.9 kg/TLW) Hogs Cattle: 1.06- 1.73 kg/head (12.7-21.3 kg/TLW) 3.0-4.8 kg/head (15.6 - 22.2 kg/TLW) Anaerobic and aerobic lab-batch tests on detergents and disinfectants used in the Bangkok slaughterhouse showed that at the actual average concentration these s ubstances appeared to be nontoxic for both aerobic and anaerobic biological treatment process. Some of these substances would have negative effects on the wastewater treatment process in case of spillage (NaOCl, Brite, SX- 207, Antibac). Statistical analysis of obtained results indicated that for s uch highly variable wastewater characteristics the necessary number of replicates needed to determine mean values with an error of 10 % with Ü=0.05 was considerably large and not practical (about 50-146 replicates needed). For an error of 20% with Ü=0.1 the sample size needed was about 10-15 replicates. Wilcoxon Two- Sample Test was carried out with composite and grab samples. It is satisfactory to analyze a few composite samples instead of a number of grab samples, which saves time and chemical for analysis.
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A thesis submitted in partial fulfillment of the requirement for the degree of Master of Engineering, School of Environment, Resources and Development
Thesis (M.Eng.) - Asian Institute of Technology, 1991
The wastewater quantity, wastewater characteristics, its treatability and pollution load from slaughterhouses were studied. All measurements and analyses were conducted at a Bangkok (Thailand) slaughterhouse. The data collected from VISSAN (a slaughterhouse in Ho Chi Minh City, Vietnam) were analyzed for comparison. In comparison to European data wastewater in both these case studies was of a higher amount (in VISSAN 900 m3/d and in Bangkok slaughterhouse 1660 m3/d) and with more diluted characteristics (CODm = 1200 - 1500 mg/l in VISSAN and 650 - 873 mg/l in the Bangkok slaughterhouse) due to high water consumption and in the Bangkok slaughterhouse also due to much infiltration water. The total waste materials discharged from the slaughtering process into WW streams found by setting up materials balance were relatively high: In Bangkok case study: In VISSAN: Hog 1.3-2.1 kg/head (13.1-20 .5 kg/TLW) Cattle: 4.8-8.8 kg/head (10.5-17.9 kg/TLW) Hogs Cattle: 1.06- 1.73 kg/head (12.7-21.3 kg/TLW) 3.0-4.8 kg/head (15.6 - 22.2 kg/TLW) Anaerobic and aerobic lab-batch tests on detergents and disinfectants used in the Bangkok slaughterhouse showed that at the actual average concentration these s ubstances appeared to be nontoxic for both aerobic and anaerobic biological treatment process. Some of these substances would have negative effects on the wastewater treatment process in case of spillage (NaOCl, Brite, SX- 207, Antibac). Statistical analysis of obtained results indicated that for s uch highly variable wastewater characteristics the necessary number of replicates needed to determine mean values with an error of 10 % with Ü=0.05 was considerably large and not practical (about 50-146 replicates needed). For an error of 20% with Ü=0.1 the sample size needed was about 10-15 replicates. Wilcoxon Two- Sample Test was carried out with composite and grab samples. It is satisfactory to analyze a few composite samples instead of a number of grab samples, which saves time and chemical for analysis.
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