Date of Award

Spring 1992

Document Type

Thesis - Restricted

Degree Name

Master of Science (MS)


Civil and Environmental Engineering

First Advisor

Novotny, Vladimir

Second Advisor

Zanoni, Alphonse E.

Third Advisor

Crandall, Clifford J.


On-site water reclamation and reuse systems can be used to solve the water resources shortage problem. Although a direct potable reuse is still not feasible, many nonpotable uses, such as irrigation and toilet flushing, allow reuse. A system for domestic gray wastewater reclamation researched in this project includes sequencing biological batch reactor (SBR) followed by filtration. Wastewater was collected from the kitchen sink, bath tub or shower, bathroom sink and laundry machine. The volume of the reactor used in this research is 4 liters with operation cycle of 24 hours. Three different operating strategies were used for comparison from which the most effective one was 12 hours of aerated fill, 6 hours of reaction, 3 hours of settling, 3 hours of idle and withdrawal. Following SBR, filtration process was used to remove the residual contaminants. There were three different filtration unit processes used: sand, diatomaceous-earth and UF membrane filtration. Among these three filters, the UF membrane filtration was the most effective process. The water quality achieved was as follows: BOD5 was 2 mg/L; TSS, color and fecal coliform were zero; turbidity was less than 0.1 NTU; COD was 50 mg/Land TOC was 12 mg/L. For additional removal of COD and TOC, 300 mg/L activated carbon was added before membrane filtration. The resulting COD was 10 mg/Land TOC was 6 mg/L in the effluent.



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