26 research outputs found
Wetlands for wastewater treatment and subsequent recycling of treated effluent : a review
Due to water scarcity challenges around the world, it is essential to think about non-conventional water resources to address the increased demand in clean freshwater. Environmental and public health problems may result from insufficient provision of sanitation and wastewater disposal facilities. Because of this, wastewater treatment and recycling methods will be vital to provide sufficient freshwater in the coming decades, since water resources are limited and more than 70% of water are consumed for irrigation purposes. Therefore, the application of treated wastewater for agricultural irrigation has much potential, especially when incorporating the reuse of nutrients like nitrogen and phosphorous, which are essential for plant production. Among the current treatment technologies applied in urban wastewater reuse for irrigation, wetlands were concluded to be the one of the most suitable ones in terms of pollutant removal and have advantages due to both low maintenance costs and required energy. Wetland behavior and efficiency concerning wastewater treatment is mainly linked to macrophyte composition, substrate, hydrology, surface loading rate, influent feeding mode, microorganism availability, and temperature. Constructed wetlands are very effective in removing organics and suspended solids, whereas the removal of nitrogen is relatively low, but could be improved by using a combination of various types of constructed wetlands meeting the irrigation reuse standards. The removal of phosphorus is usually low, unless special media with high sorption capacity are used. Pathogen removal from wetland effluent to meet irrigation reuse standards is a challenge unless supplementary lagoons or hybrid wetland systems are used
Modelagem matemática da secagem convectiva com radiação infravermelha de grãos de Moringa oleifera
Applicability of Moringa oleifera Lam. pie as an adsorbent for removal of heavy metals from waters
The effectiveness of Moringa oleifera as primary coagulant in high-rate settling pilot scale water treatment plant
High-rate settling module has long been found to be useful in enhancing the settling of flocs in the water
treatment plant. In this study pilot plant test was carried out to assess the effectiveness of high-rate settling
module for treatment of synthetic turbid water using alum. The percentage of turbidity removal using high-rate
settling module was about 20% better than the turbidity removal without high-rate settling module. Furthermore,
the coagulation efficiency of crushed seed kernels from Moringa oleifera Lam. was examined using high-rate
settling module pilot plant. The result revealed that, seeds of M. oleifera have shown promise as a coagulant for
water treatment. The turbidity after filtration was well below the World Health Organisation’s guideline value
of < 5 NTU for drinking water from the synthetic turbid water of 200 NTU