Identification of Bacteria in Wastewater Essay example -- Scientific R

The analytical techniques for direct detection, enumeration, isolation and identification many different types of pathogenic bacteria in wastewater and accompanying sludge require well-trained technicians. Also it's usually are unpredictable, difficult, hugely expensive, costly and time-consuming procedures. The task would be enormous if one contemplates the monitoring of hundreds of pathogens and parasites on a routine basis in water and wastewater treatment plants, receiving waters, soils and others environmental samples (Lucero-Ramirez, 2000 and Bitton, 2005). To avoid these problems, Toze (1997) reported that the indicator microorganisms are indicators of fecal pollution used to determine the relative risk of the possible presences of microbial pathogens. Indicator organisms are also used as models for the behavior of pathogens e.g. to determine the efficiency of treatment processes. In this study the bacterial load of the effluent samples examined in this study was summarized in Table 1. There are no significant differences between geometric means of TBC and TC cell number in all samples collected from STP1, STP2 and STP3. The log10 CFU /100 mL of TC of effluent samples collected from STPs was significantly different from the log10 of FC and enterococci cell number (P ≠¤0.05 as determined by ANOVA). The geometric mean values for the TC ranged from 6.12 to 5.39 log10 CFU /100 mL. Enterococci levels in treated effluent at STP1 were significantly less than STP2 and STP3. According to data collected from STPs under study, STP2 is specific for treated of the domestic sewage coming from medical centers, while STP1 treated the wastewater coming from laboratories that operate on the experiences of pharmaceutical in the educationa... ...tion complies with the WHO guidelines for unrestricted irrigation regarding the FC content (≠¤1000 CFU/100 mL or 3 log10 CFU/100 mL). According to Alcalde et al., (2003) the effluent which has these parameters can be used for unrestricted irrigation of several crops during the entire year without any additional disinfection treatment. This results were accepted by Deportes et al. (1998) who reported that during storage, indicators and pathogenic microorganisms remained either undetectable or at low level. Moreover, survivals of microorganisms that are associated with solids are more than when they are suspended in water (Straub et al., 1992). Works Cited Straub, T. M., Pepper, I. L. and Gerba, C. P. (1992): Persistence of viruses in desert soil amended with anaerobically digested sewage sludge. Journal of Applied Environmental and Microbiology (58), 636–645.