Sludge Characteristic and Pathogen Inactivation of Two Different Wastewater Treatment Plants in Antalya (original) (raw)
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Ecological Engineering, 2015
Biological urban water treatment plants utilize microorganisms for wastewater purification so that microbiological characterization of processes is very important. In addition, its removal in the effluent and outlet sludge for their reuse is important. This work aims to characterize the presence of bacteria and parasites along the processes in wastewater treatment plant (WWTP) and the possibility of using the purifying water and sludge in agriculture. The results show a high level of Escherichia coli in the raw water. Although their total removal is not achieved, a reduction of 2.34 and 1.36 log in the concentration of E. coli was produced along the water and sludge treatment lines, respectively, being the trickling filters (TF) and autothermal thermophilic aerobic digestion (ATAD) the most effective processes against bacteria. Clostridium perfringens, which is a Grampositive bacillus and fecal contamination indicator, although less usual than E.coli, is detected in washing water of solids which are stored in anoxic conditions and in the sludge treatment line where dissolved oxygen is absent including in the outlet of plant. Salmonella spp, Entamoeba and Cryptosporidium were not detected in any of the samples, meanwhile Giardia duodenalis was identified only in two samples from washing coarse solids and sludge, but it was not identified in outlet water and sludge. Acanthamoeba was the most frequent protozoa isolated. 2014 Elsevier B.V. All rights reserved.
The importance of Evaluation of microorganisms in raw sewage sludge intended for agriculture
Research Square (Research Square), 2024
The present study was conducted to determine the microbiological characteristics of sewage sludge from ve waste-water treatment plants (WWTPs) in eastern Algeria and to assess the e ciency of drying beds in lowering the microbial load in this sludge, which is typically used in agricultural elds. We chose the ve most signi cant waste-water treatment facilities in Algeria's Eastern area to carry out this study. Where we have counted harmful microorganisms (Salmonella, Clostridium), and examined parasites. Total coliforms, fecal "E. coli" and fecal streptococci were used as indicators of fecal contamination. The obtained results indicate that the examined sewage sludge is a rich source of microorganisms, particularly bacteria of fecal origin, especially during the months of high temperature (Spring, Summer), and moor particular in the sludge of medium age (more than 1 month). As a result, we have reported a signi cant presence of anaerobic sulfate-reducingria (ASR), Salmonella spp., and E. coli. We also observed that this sludge included parasites, ranging from protozoa to helminth eggs. We may draw the conclusion that even if the microbiological load in the sewage sludge signi cantly decreased after treatment in the drying beds, the hazards associated with the spread of this sludge must be managed by adherence to a set of exact guidelines. This study allowed us to determine the microbiological properties of sewage sludge, through which we can reduce the risks or de nitively eliminated, which allows the possibility of valued them in the agricultural sector by avoiding all possible environmental risks and even on health public.
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1993
Information concerning pathogen densities in wastewater sludge is scarce, particularly for Australian sludges. As part of a project investigating the die-off of pathogens in stored sludge pathogen densities in sludge from Perth wastewater treatment plants were determined. Faecal coliform, faecal streptococci, enterovirus and Salmonella concentrations in sludge were quantified. Campylobacter, Shigella, Legionellaand helminths were not detected in sludge using qualitative tests. Giardia and Entamoeba were present in raw sludge but were not detected in digested and dewatered sludge. There was no consistent relationship between the die-off of indicator organisms and pathogens through sludge treatment. Pathogens generally survived treatment better than faecal coliforms and faecal streptococci. On the basis of these results the use of indicator bacteria to predict pathogen densities in wastewater sludge may not be appropriate.
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Journal of Agricultural Research, 2016
Biological urban wastewater treatment plants utilize microorganisms for wastewater treatment so that microbiological characterization of processes is very important. In addition, the removal of these microorganisms in the effluent for their reuse is important. This study aims to characterize the presence of microbial flora and chemical pollutants along the processes in Wastewater Treatment Plant (WTP) at ZagazigCity. The removal efficiency of total bacterial counts was approximately 20 -74% during all the periods of study from April 2011 up to January 2012. However, the average total Enterobacteriaceae count in the wastewater samples reduced in all the periods by 85% except in June and December 2011in which the reduction was varied between 29-37%. The results show a high level of coliforms, Escherichia coli, Salmonella and Shigella in the raw wastewater; although their total removal is not achieved (the removal efficiency was 11 to 83 %). Candida spp., which is a yeast indicator, al...
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In this study, qualitative characteristics of the sludge produced in Hamadan wastewater treatment plant and the feasibility of its application in agricultural lands were investigated. Samples were taken from the primary and secondary sludge and indices such as VS/TS, PH, TKN, COD, TKN, SOUR, Na, Ca, SAR, heavy metals and biological properties (the mean fecal coliform count and the number of parasitic eggs) were measured. The results were compared with the United States Environmental Protection Agency (US EPA) standards (40 FCR-503). The results showed that the VS/TS ratio of the raw sludge was 0.8, 0.55, and 0.55 and that of the secondary sludge was 0.65, 0.28, and 0.32 for fall, winter, and summer, respectively. The average concentration of COD, TKN, SOUR, Na, and Ca for the initial sludge was 51283, 107, 0.50, 609, and 952 and for secondary sludge, it was 35595, 81, 4.90, 306, and 493 mg/L, respectively. The MPN for primary and secondary sludge was determined to be 19.83 × 10 6 and 186 × 10 6 , respectively and the average number of parasite eggs in primary and secondary sludge was 7.05 and 7.2 in 4 g of dry solids. Entamoeba coli had the highest number of parasite. The results of this study showed that the highest concentration of heavy metals in the sludge was 21 396 mg/kg. The values obtained for the above-mentioned indices and heavy metals were in standards range. The results of this study show that none of the primary and secondary sludge samples has been properly stabilized. The values obtained for biological characteristics of sludge were not in the standard range. Therefore, it was revealed that the use of sludge for agriculture needed more stabilization.