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RISS 인기검색어
- 검색키워드
- 저자 : Nawel Nedjah (검색결과 2 건)
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Nawel Nedjah,Nabila Laskri 보안공학연구지원센터 2015 International Journal of u- and e- Service, Scienc Vol.8 No.7
This research work aims at highlighting the importance of wastewater treatment generally and removing phosphorus from these waters specifically, in order to preserve our environment. Reducing the rejected quantity of phosphorus, nutrient element, in the receiving environments, enables the restriction of the phenomenon of water streams eutrophication. This is the primary objective of our research. Both the chemical and biological treatments are recognized as effective for phosphorus removal from waste water. In our study, we worked on phosphorus removal from urban wastewater through three treatments types: chemical, biological, and a combined one. The findings of the chemical treatment demonstrated a good treatment efficiency of the organic matter: 95% of DCO and 88% of phosphorus; as per the biological treatment: 60% of DCO and 49% of phosphorus were found. A further treatment has been conducted through combining the first couple of treatments. This combination method seeks to find the optimal dose of the different conventional coagulants namely lime, ferric chloride and aluminum sulfate .The combined treatment resulted in a better phosphorus removal efficiency: 83% of phosphorus and 96% of DCO. The obtained results proved to be highly encouraging and incite the responsible / heads of STEP to adapt and apply this type of treatment which revealed to be an appropriate purification technique of wastewater.
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Comparative Study for Biogas Production from Different Wastes
Nabila Laskri,Nawel Nedjah 보안공학연구지원센터 2015 International Journal of Bio-Science and Bio-Techn Vol.7 No.4
The bulk of our work was performing the anaerobic digestion of wastes rich in organic matter in a laboratory prototype. The two different substrates: the biodegradable waste from landfill and sludge from the wastewater treatment plant by natural lagoon. We surveyed the evolution of the degradation of organic matter of both experiments which are carried in a digester with a capacity one liter, sealed. During the experiments we followed themeasure of the COD (chemical oxygen demand), the volume of biogas formed during the digestion, the temperature and the pH.The biogas produced from the anaerobic digestion of the two substrates is flammable with a percentage of CH4 more than 64%. Comparing the volume of biogas produced during the digestion of the two substrates of digestion we found that the volume collect from the sludge waste is greater than 10 times relative to thevolume of biogas produced with organic matter in the landfill. The volume of biogas produced is always a function of the residence time of digestion and the concentration of organic matter in the experiment. The percentage of decrease in COD of the sludge was estimated at 87.3% and the substrate of the landfill is 82.44%.
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