

@article {10993,
	title = {Improved alkaline stabilization of municipal wastewater sludge},
	journal = {Water Science and Technology},
	volume = {46},
	number = {10},
	year = {2002},
	month = {nov},
	pages = {139},
	abstract = {<p>In Mexico, physicochemical sludge contains high levels of pathogens; and alkaline stabilization is an alternative for their control. However, the odours caused mainly by ammonia generation represent a disadvantage. On the other hand, the ammonia is known as an effective disinfectant. The aim of this study was to evaluate the disinfectant properties of ammonia in sludge, and use it in a closed alkaline stabilization system, which, not only copes with odours but also increases the efficiency of the process. Raw sludge from a municipal wastewater treatment plant using a physicochemical process was used. Ammonia was applied in doses from 10 to 50\% w/w; also, doses from 5 to 40\% of CaO were applied in open and closed systems and raw and treated sludge quality was evaluated. Results showed that ammonia removed 6 and 5 logs of faecal coliforms and Salmonella spp., respectively and up to 94\% of viable helminth ova. The closed system was more efficient than the open system when applying doses from 5 to 20\% of CaO. Finally, the results indicate that the ammonia represents an alternative to disinfecting wastewater sludge and it can be used to enhance alkaline stabilization processes.</p>
},
	url = {http://wst.iwaponline.com/content/46/10/139.abstract},
	author = {Mendez, J.M. and Jim{\'e}nez, B.E. and Barrios, J.A.}
}
