Water treatment plant sludge disposal into stabilization ponds.

Researchers have paid particular attention to the disposal of sludge produced in water treatment plants (WTPs) into wastewater treatment plants (WWTPs) for further processing, mainly because it is considered an attractive alternative for the treatment of waste generated in water production processes. This study evaluated the effects of flow equalization and disposal of sludge, from a conventional WTP, into a WWTP system that includes an anaerobic stabilization pond followed by a facultative pond. During the period of sludge discharge from the WTP into the wastewater system, the influent to the WWTP presented an increase of 17% (from 171 to 200 mg L(-1)) of total suspended solids (TSS) and a 7.

Detection and quantification of viable Ascaris sp. and other helminth eggs in sewage sludge.

Some epidemiologic studies conducted in developing countries demonstrated a high incidence of enteroparasites, Ascaris sp. being the most prevalent. Therefore, the use of sewage sludge in agriculture may pose risks to human health.

Parasitological risk assessment from wastewater reuse for disposal in soil in developing countries.

The purpose of this work is to analyze the parasitological risks of treated wastewater reuse from a stabilization pond in the city of Piracicaba, in the State of São Paulo (Brazil), and the level of treatment required to protect public health. Samples were taken from raw and treated wastewater in stabilization ponds and submitted to a parasitological, microbiological and physicochemical analysis. The study revealed on treated wastewater the presence of Ascaris sp.

Detection of assemblages A and B of Giardia duodenalis in water and sewage from São Paulo state, Brazil.

Giardia duodenalis is a protozoan that parasitizes humans and other mammals and causes giardiasis. Although its isolates have been divided into seven assemblages, named A to G, only A and B have been detected in human faeces. Assemblage A isolates are commonly divided into two genotypes, Al and All.

[Sanitary and socio-environmental conditions in the Iauaretê indigenous area, São Gabriel da Cachoeira, Amazonas State, Brazil].

Objective: To describe sanitary, social and environmental conditions that are significant for health of residents in the Iauaretê Indigenous Area in Brazilian Amazonia, notable for its population concentration.

Method: Qualitative and quantitative methodologies were used, with the action research method deployed mainly for qualitative approaches, through community meetings with tribespeople and researchers in the villages constituting the hub of the Area. Talking maps were prepared and interviews were conducted, together with studies of solid wastes disposal techniques, in addition to locating, sampling and analyzing the quality of water used for human consumption, in parallel to the use of geo-referencing techniques.