TAILIEUCHUNG - Waste Water Evaluation and Management Part 12

Tham khảo tài liệu 'waste water evaluation and management part 12', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Parasitological Contamination in Organic Composts Produced with Sewage Sludge 319 viable eggs recovered and a lagoon containing 6-year-old sediments still showed 26 viable eggs. Regarding anaerobic digestion 66 of viable eggs were recovered in the one sample. For the compost the analysis on a small number of 8 eggs showed a viability of 25 and the chemical treatment with lime after 20 days of storage gave 66 of viable eggs. Jhonson et al. 1998 evaluated an in-vitro test for the viability of Ascaris suum eggs exposed to various sewage treatment processes. After one week in a mesophilic anaerobic digester 95 of A. suum eggs produced two-cell larvae in vitro with 86 progressing to motile larvae. After five weeks in the digester 51 progressed to motile larvae. Between 42 and 49 of eggs stored in a sludge lagoon for 29 weeks were viable and able to develop motile larvae. In the case of eggs that were embryonated before treatment 98 survived up to five weeks in the digester and were able to develop motile larvae. More than 90 of embryonated eggs survived for 29 weeks in the sludge lagoon and were able to develop motile larvae. Solid waste landfill leachate and sewage sludge samples were quantitatively tested for viable Enterocytozoon bieneusi Encephalitozoon intestinalis Encephalitozoon hellem and Encephalitozoon cuniculi spores by the multiplexed fluorescence in situ hybridization FISH assay. Depending on the variations utilized in the ultrasound disintegration sonication reduced the load of human-virulent microsporidian obligate intracellular parasites spores to no detectable levels in 19 out of 27 samples . Quicklime stabilization was 100 effective whereas microwave energy disintegration was 100 ineffective against the spores of E. bieneusi and E. intestinalis. Top-soil stabilization treatment gradually reduced the load of both pathogens consistent with the serial dilution of sewage sludge with the soil substrate. This study demonstrated that sewage sludge and .

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