Abstract
Wastewater treatment is a serious environmental problem, especially in developing countries such as Morocco. Their discharge into the natural environment has negative impacts on water resources and the environment. They are therefore purified to reduce the concentration of the main pollutants. Often biological remediation is used when wastewater contains biodegradable organic pollutants. This generally leads to treated water that can be discharged into the environment reused, or used as wastewater sludge. In the case of domestic or municipal water, this sludge has a fermentable character, which can have negative impacts on the environment especially when it is discharged directly into the environment. This sludge is subjected to various aerobic or anaerobic treatments to reduce the fermentable fraction. Anaerobic treatment seems more attractive because it gives the way to eliminate organic matter, produce biogas and manure compost both in one time. In this work, an experimental study was conducted on the ambient temperature anaerobic digestion of sewage sludge in two reactors, one operating without agitation and the other with agitation, to evaluate the impact of the latter on the biological process. Key words: Bio-methanization, ambient temperature, agitation, methanogenic potential, sludge, wastewater treatment plant, COD, pH.
Highlights
Some solid wastes have a fermentable organic fraction which is an environmental problem
Many studies have shown the importance of agitation on the fermentation process ; in the first hand Johan Lindmark (Lindmark, 2014) evaluated the effect of mixing by comparing three régimes of mixing; 150 rpm, 25 rpm and continuous mixing; The results prove that the biogas production is better with a speed of 25 rpm which reaches 240 Nml, while the speed of 150 rpm gives a lower production of biogas; the author found that strong agitation inhibits the anaerobic fermentation process
Many studies have shown the importance of agitation on the fermentation process; in the first hand Johan Lindmark evaluated the effect of mixing by comparing tress régimes of mixing 150 rpm, 25 rpm and continuous mixing; The results prove that the biogas production is better with a speed of 25 rpm which reaches 240 Nml, while the speed of 150 rpm give a lower production of biogas ; the author found that strong agitation inhibits the anaerobic fermentation process
Summary
Some solid wastes have a fermentable organic fraction which is an environmental problem. Aitlahyane et al 261 environment could be a real threat This organic character can be used wisely, by valorizing its potential in value-added products when subjected to anaerobic biological treatment, which, in addition to reducing negative effects (emission of bad odors, methane, mercaptans, etc.), makes it possible to produce biogas and sludge mineralization for soil amendment. This solid waste includes sludge from wastewater treatment plants. In Morocco, their quantity is estimated at 435.600 tonnes /year (Afilal, 2013), and have a fermentable organic fraction between 50 and 70% (Eva, 2004); this is a good source for anaerobic biogas production, consisting mainly of methane 60 to 75% (Eva, 2004), the equivalent of 128,000 tonnes of CH4 per year
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