Improving environmental sanitation, health, and well-being: a conceptual framework for integral interventions.

We introduce a conceptual framework for improving health and environmental sanitation in urban and peri-urban areas using an approach combining health, ecological, and socioeconomic and cultural assessments. The framework takes into account the three main components: i) health status, ii) physical environment, and iii) socioeconomic and cultural environment. Information on each of these three components can be obtained by using standard disciplinary methods and an innovative combination of these methods.

Hydraulic behaviour of vertical-flow constructed wetland under different operating conditions.

Five vertical-flow constructed wetland (VFCW) units planted with cattail (Typha augustifolia) were used to study the effects of feeding (continuous and batch), hydraulic loading rates (HLR) and drainage patterns (free drainage and percolate impounding) on hydraulic behaviour. The tracer studies were divided into two parts: (i) continuous feeding at an HLR of 0.005, 0.

Recovery of biosolids from constructed wetlands used for faecal sludge dewatering in tropical regions.

Biosolids recovered from yard-scale vertical-flow constructed wetlands used for faecal sludge dewatering in Cameroon, were analyzed to assess their degree of maturity, nutrient and heavy metals contents, as well as their hygienic quality. Six beds were loaded weekly at nominal loading rate of 100, 200, and 300 kg TS/m2/year. The quality of the biosolids accumulated in the beds was monitored during 6 additional months of resting period prior to final harvest.

Co-composting of faecal sludge and organic solid waste for agriculture: process dynamics.

This paper presents the potentials and performance of combined treatment of faecal sludge (FS) and municipal solid waste (SW) through co-composting. The objectives were to investigate the appropriate SW type, SW/FS mixing ratio and the effect of turning frequency on compost maturity and quality. Solid waste (SW, as market waste, MW, or household waste, HW) was combined with dewatered FS in mixing ratios of 2:1 and 3:1 by volume and aerobically composted for 90 days.

Influence of sand layer depth and percolate impounding regime on nitrogen transformation in vertical-flow constructed wetlands treating faecal sludge.

Four laboratory-scale units of vertical-flow constructed wetlands (VFCW) were fed once a week with faecal sludge (FS) at a constant solids loading rate (SLR) of 250 kg TS/(m2.year) (equivalent to 260-300 gN/(m2.week)) for a period of 12 weeks to study: i) the nitrification and denitrification potential of the sand layer of VFCWs and ii) the effect of percolate impounding regime (permanent or batch-impounding) on nitrogen transformation.

Helminth eggs inactivation efficiency by faecal sludge dewatering and co-composting in tropical climates.

This study investigates helminth eggs removal and inactivation efficiency in a treatment process combining faecal sludge (FS) dewatering and subsequent co-composting with organic solid waste as a function of windrow turning frequency. Fresh public toilet sludge and septage mixed at a 1:2 ratio were dewatered on a drying bed. Biosolids with initial loads of 25-83 helminth eggs/g total solids (TS) were mixed with solid waste as bulking material for co-composting at a 1:2 volume ratio.