Bio-treatment of saline wastewater generated by using seawater flushing toilets

• Autorzy: Yongzhen P. , Youwei C. , Shuying W. , Haidong W.
• Konferencja: Proceedings of the German-Chinese-Polish Symposium Environmental Engineering
• Języki publikacji: EN

Abstrakty

EN

There is very little known about the feasibility and effectiveness of biological treatment for saline wastewater generated by using seawater for flushing toilets. Therefore we devised experiments to examine the treatment of highly saline wastewater resulting from using seawater for flushing toilets to explore the feasibility of treating saline sewage by biological processes, effects of salinity on bio-treatment system and the behavior of activated sludge system during salinity shock. Lab scale sequencing batch reactors (SBR) were initially operated at low, and then at increasing salt levels. The microbial populations during these experiments were monitored to determine the specific effect of salinity on the various bacterial groups responsible for pollutants removal. The performance of system was evaluated under different operating conditions such as salt concentration. The results indicated that although high salinity inhibited the microbial growth and decrease organic matter degrading velocity and removal efficiency, the saline sewage with blew 20g/L salinity can be treated by biological process. The increasing salt concentration decreased the yield of biological solids and changed the structure of microorganism ecology. High salinity bettered settleability of activated sludge and changed the structure of activated sludge floes. Shock of salinity can cause upset of disposal system not only when increasing influent salinity but when decreasing influent salinity. However, when increasing salinity the elapsed time needed restoring was longer than when decreasing salinity. These research results are attributable to flexibilities of operation in a full-scale treatment plant processing saline sewage.

Słowa kluczowe

EN

flushing toilets with seawater; biological treatment; saline sewage; salinity shock

• Wydawca: Oficyna Wydawnicza Politechniki Opolskiej
• Czasopismo: Zeszyty Naukowe. Inżynieria Środowiska / Politechnika Opolska
• Rocznik: 2003
• Tom: Vol. 291, z. 4
• Strony: 303--309
• Opis fizyczny: Bibliogr. 6 poz., tab., wykr.

Twórcy

autor

Yongzhen P.

• College of Environmental and Energy Engineering, Beijing University of Technology, Beijing, 100022

autor

Youwei C.

• College of Environmental and Energy Engineering, Beijing University of Technology, Beijing, 100022

autor

Shuying W.

• College of Environmental and Energy Engineering, Beijing University of Technology, Beijing, 100022

autor

Haidong W.

• College of Environmental and Energy Engineering, Beijing University of Technology, Beijing, 100022

Bibliografia

• 1. Tokuz R.Y. and Eckenfelder W.W.The Effect of Inorganic Salts on the Activated Sludge Process Performance. Wat. Res. 1979,13:99~104
• 2. Kincannon D.F. and Gaudy A.F..Some Effects of High Salt Concentration on Activated Sludge. WPCF. 1966,38(7): 1148-1159
• 3. Hamoda MF and Al-Atlar. (1995) Effect on High Sodium Chloride Concentrations on Activated Sludge Treatment. Wat.Sci.Tech., 31(9):61-72o
• 4. GW.Lawton and E.V.Eggert,(1966)Some Effect of High Sodium Chloride Concentrations on Trickling Filter Slimes .Sewage Ind.Wastes,29.121-128.
• 5. E.V.Mills and A.B.Wheatland,(1962).Effect of Salinę Sewage on the Performance of Percolating Filters .Water Waste Treatment,9.170-172.
• 6. Doudoroff M.. Experiments on the Adaptation of E. coli to Naci. Gen. Physiol. 1940, 23: 585-611.