|Budget Amount *help
¥2,000,000 (Direct Cost : ¥2,000,000)
Fiscal Year 1997 : ¥1,000,000 (Direct Cost : ¥1,000,000)
Fiscal Year 1996 : ¥1,000,000 (Direct Cost : ¥1,000,000)
1, The role of layrs of charcoal, zeolite, and various soils in MSL,Multi-Soil-Layring, system. Zeolite layr is important for nitrogen removal through enhancement of ammonium ion fixation, nitrification and denitrification. However, Zeolite did not show superior characteristics as a carrier of iron hydroxide for phosphate fixation. Difference of soil species was not dramatic. Long term treatment of relatively high concentration waste showed some difference of soil species. Andisols, Kuroboku soil, showed the best performaance, calyey Ultisols, Red soils, comes the next, sandy Entisols, Masa soil, showed the worst performance among the three soils tested.
2, The MSL system showed the potential to apply high concentration piggery waste water treatment. Optimum aeration reduced the BOD and P dramatically. However, if T-N concentration is higher than 500 ppm, the treatment was not stable and poor. Dilution to T-N less than 100-200ppm was necessary.
3, Long term on-site treatment of domestic
waste water by MSL has been continued 8 years successfully. If aeration is controlled optimum, MSL showed the quality of treated water less than 15ppm of BOD,less than 15ppm of T-N and less than 2ppm of T-P.The simple way to control aeration was established. The on-off of 24hr aeration showed dynamic and systematic changes of Transparency, BOD,SS,T-N,NO3-N,NH4-N,T-P,pH,and ORP.The transparency and pH may be the best simple indicators for on-off aeration management.
4, The MSL system was successfully applied to the treatment of restaurant and toilet waste water treatment at Kasetsart University cafeteria, Bangkok, Thailand. The MSL system showed dramatic improvement of treatment performance comparing traditional soil infiltration system widely used in the region.
5, The, IAP-zeolite, iron ammonium phosphate zeolite was formed during the long term biogenic waste water treatment by MSL The IAP-zeolite showed function as an excellent soil conditioner throug the amendment trials to rice soils and vegetable soils. Less