Performance Evaluation of a Waste Stabilization Pond in a Rural Area in Egypt

Abstract

Abstract:The performance evaluation of the waste stabilization pond (WSP) as a model of domestic wastewater treatment unit in rural area was carried out. The unit comprised of anaerobic, facultative and maturation ponds in two series. The effluents of WSP which are discharged in the drain had the BOD reduced to 109-245 mg L , 44.3% removal). The reduction percentages of total coliform (TC), faecal coliform (FC), E.coli, faecal streptococci (FS), salmonellae and Listeria were 98.8, 95.6, 79.4, 96.8, 97.9 and 89.5% respectively. Also, the removal percentages of coliphage and infectious rotaviruses were 49.03 and 99.66% respectively. Identical sequences of rotaviruses VP-6 detected in the final effluent of the pond and the drain were observed. Euglena variables and Chlamydomonas reinhardii were predominant in anaerobic, facultative and maturation effluents. It has been noticed that pollution affected species diversity of zooplankton; the number of species in facultative pond was 8 species because of high pollution level, whereas in maturation pond increased to 21 species. Also, pollution in anaerobic pond increased density of ciliates (Protozoa) which are known to be bio-indicators of organic pollution. The percent removal of ciliates in the maturation pond was 70%. It is recommended to make some modifications in the design to increase the efficiency of WSP.

Survey on Treatment Ability of Stabilization Pond as a Natural Treatment System in Oil Refinery Wastewaters

“…COD/BOD 5 ratio in the input and output of the system were 2.07 and 2.05, respectively. Moreover, WSP performance in the treatment of the oil refi nery wastewater in different input phenol concentrations was better than that of Ghazy et al [20] study results. In the current study, the removal effi ciencies of COD, BOD 5 , and PO 4 by WSP were 29.63%, 28.38%, and 16.74%, respectively.…”

Waste stabilisation ponds for anaerobic wastewater treatment

“…This trend is analogous to start-up trends observed in high-rate anaerobic processes applied to treatment of domestic wastewater at ambient temperature. While the linearity observed between TCOD removal and time demonstrates that the reactor has yet to reach steady state, the TCOD removal exceeds that observed during WSP studies operated over extended time periods and at higher mean operating temperatures (Ghazy et al, 2008;Picot et al, 2003). Toprak (1993) postulated that 25-40% TCOD removal could be achieved through physical settlement of suspended solids and was thus independent of biological degradation.…”

Prevalence of Rotaviruses Groups A and C in Egyptian Children and Aquatic Environment

“…Rotavirus CC-RT-PCR assay was performed according to Abad et al (1997), El-Senousy et al (2007), and Ghazy et al (2008). The assay was performed on suspensions of infected MA104 cells.…”