Treatment of wastewater from cafeteria by multi-soil layering system
1997
Tasnee Attanandana | Suphakan Luanmani | Banyat Saitthiti | Suthep Thongpae (Kasetsart Univ., Bangkok (Thailand). Faculty of Agriculture. Dept. of Soil Sceince)
Treatment of the wastewater from cafeteria at Bangkhen Campus, Kasetsart University with and without dilution by Multi-Soil Layering System was studied. The component of the Soil Multi-Layering System was Pak Chong soil series mixed with iron scrap and pelletized jute or corncob or kenaf at the ratio of 75:15.5:12.5. The mixture was filled up in the 15*50*100 cm models as brick-like pattern. Charcoal was put on the top of the mixture layer, Zeolite, sand or limestones was inserted between each layer. Wastewater was discharged continuously from the top of the model through the system by gravitational force. Wastewater and treated water were collected every two week for chemical analysis. The results revealed that the combination of sand+kenaf and sand+corncob had the most effects to reduce 52-77, 82-83, 92-93, 69-78, 98 and 100 percent of suspended solid, BOD, COD, total N, total P and dissolved P, respectively, but clogging was observed in this two treatments. The combination of zeolite+corncob was effective to reduce 42, 55, 79, 75, 70, and 92 percent of suspended solid, BOD, COD, total N, total P, and dissolved P, respectively with the hydraulic loading rate of 519 l square m/d. While the combination of zeolite+kenaf could remove 46, 53, 80, 74, 84 and 92 percent of those pollutants with 446 l square m/d. When the wastewater was diluted 4 times, the removal percentage of the pollutants were lower compared to the study of undiluted wastewater.
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