Treatment of landfill leachate with reverse osmosis. (Water Quality and Treatment 02:00 PM, Saturday, April 5, 2003 Brewer/Frost Science 138 Dr. Yung-Tse Hung-Presiding).

Hung, Yung-Tse ; Javvaji, Rama Krishna ; Lo, Howard H. 等

3:00

This paper describes the study of landfill leachate by reverse osmosis process (RO). The objective of the study was to determine the treatment efficiency of landfill leachate by membrane processes. Three different types of landfill leachate studied included one leachate from a conventional landfill and two leachates from a biodegradable waste site. Dense, composite RO membrane used in the study had 99% NaCl retention at 0.5 wt % NaCl, 4 Mpa, and 15 UC. A linear correlation was found between flux and conductivity for leachate from both the conventional landfill and the biodegradable waste cell. The flux was between 3 and 48 L/[m.sup.2]/h. Membrane fouling by CaC[O.sub.3] caused reduction of flux. By adjusting pH to below 6.5 membrane fouling was reduced and the flux of leachate from biodegradable waste cell could be maintained above 35 L/[m.sup.2]h. The RO membrane removed more than 98% of COD (chemical oxygen demand), and N[H.sub.4]-N from leachate from both the conventional landfill and the biodegradable waste. The salt concentration and also the osmotic pressure were very high for leachate from the cell containing special waste. The flux was too low for effective RO treatment for this type of leachate.

YUNG-TSE HUNG Y.HUNG@CSUOHIO.EDU AND RAMA KRISHNA JAVVJI JRAMAKRISHNA123@REDIFFMAIL.COM, CIVIL AND ENVIRONMENTAL ENGINEERING DEFT HOWARD H. LO H.LO@CSUOHIO.EDU, DEFT OF BIOLOGICAL GEOLOGICAL AND ENVIRONMENTAL SCIENCE, CLEVELAND STATE UNIVERSITY, CLEVELAND OH 44115-2214.