Biomedical subjects

D Koné

Publications and source records attributed to D Koné.

4 recordsLinked to original sources

PubMed2005

Treatment of septage in constructed wetlands in tropical climate: lessons learnt from seven years of operation.

In tropical regions, where most of the developing countries are located, septic tanks and other onsite sanitation systems are the predominant form of storage and pre-treatment of excreta and wastewater, generating septage and other types of sludges. The septage is disposed of untreated, mainly due to lack of affordable treatment options. This study presents lessons that have been learned from the operation of pilotscale constructed wetlands (CWs) for septage treatment since 1997. The experiments have been conducted by using three CW units planted with narrow-leave cattails (Typha augustifolia) and operating in a vertical-flow mode. Based on the experimental results, it can be suggested that the optimum solids loading rate be 250 kg TS/m2 yr and 6-day percolate impoundment. At these operational conditions, the removal efficiencies of CW units treating septage at the range of 80-96% for COD, TS and TKN were achieved. The biosolid accumulated on the CW units to a depth of 80 cm has never been removed during 7 years of operation, but bed permeability remained unimpaired. The biosolid contains viable helminth eggs below critical limit of sludge quality standards for agricultural use. Subject to local conditions, the suggested operational criteria should be reassessed at the full-scale implementation.

Agriculture↗

PubMed2005

Isolation of Salmonella sp. in sludge from septage treatment plant.

Waste stabilization ponds (WSP) are an often-used option to treat faecal sludges collected from on-site sanitation systems. Since agricultural use is one of the most attractive options for sludge disposal, specific guidelines on the hygienic sludge quality must be fulfilled, such as for viable helminth eggs and Salmonella sp. Although Salmonella isolation methods are well known for other types of samples, they are not suitable for faecal sludge. The reason can be attributed to the co-existence of a native bacterial sludge flora masking Salmonella development, especially if this bacteria is present at low concentrations. In order to select the best methodology for Salmonella recovery from septage sludge, different culture media were assayed at different incubation periods and temperatures. The proposed methodology for Salmonella recovery from sludge can be summarised as follows: (1) enrichment in Rappaport-Vassiliadis broth at 43 degrees C, 48 hours, and (2) isolation in XLD agar at 40 degrees C, 24 hours. Identification of suspected colonies by biochemical tests: TSI, LIA, urease and serological confirmation with Group O Antigen.

Agar↗

PubMed1995

Prediction of performance from motivation and ability information in Burkina Faso adolescent.

Many studies, using information integration theory, have been devoted to the prediction of performance on the basis of ability and motivation information. However, it appears that only two societies. American and East Indian, have been examined with regard to their prevalent performance prediction model. Participants in this study were school children in Burkina Faso, West Africa. Considerable differences between individuals were expected because, as a consequence of colonization, Burkina Faso has been torn between two different value systems: a collectivistic system, with traditional tribal Burkinabè values, and an individualistic system, with occidental values. The study's most notable finding was the coexistence of these two value systems within the same society. The predominant logic of Western societies, that increased motivation will result in increased rewards when initial ability is high, was utilized by 42% of the children; in contrast, 38% of the children applied the dominant logic expressed by East Indian researchers, who have found that regardless of the level of ability, any amount of motivation will result in an identical improvement in performance.

Adolescent↗

PubMed1994

Societal risk perception and media coverage.

The study compares societal risk ratings by inhabitants of two countries which differ markedly in terms of geography, economics, politics, and ethnic background, but which are similar as regards media coverage. The two populations were represented by a sample of French students and a sample of Burkina Faso intellectuals. The overall Burkinabè mean ratings appeared much closer to the mean observed in France (and in the United States-roughly 40 out of 100) than the means reported for other countries like Norway or Hungary. The correlation between Burkinabè and French ratings was very high: .852. The findings argue in favor of a practically totally determinant effect of the media in risk perception.

Africa, Western↗