Disinfection of wastewater: comparative evaluation of chlorination and DHS-biotower.

The present study reports the onsite evaluation of two pilot scale disinfection units. One of the pilot plants is based on chlorination, and other is based on fixed film aerobic process (biotower). Evaluation study consisted of onsite monitoring of COD, BOD5 and TSS and fecal coliform over a period of three months.

Monitoring of pathogenicity of effluents from the UASB based sewage treatment plant.

The microbial profile of an Upflow Anaerobic Sludge Blanket Reactor based sewage treatment plant located at a suburb of Delhi, India, and possible risk due to the pathogenicity of the treated wastewater was investigated. Frequency of occurrence of Salmonella, Shigella and Vibrio was 100% at all the stages of sewage treatment. However, recovery of Vibrio was the highest among all the pathogens.