Abstract-We are interested in carrying out the process called anaerobic digestion of two different substrates: the biodegradable waste from landfill and sludge from the wastewater treatment plant by natural lagoon. The experiment is performed in a digester with a capacity one liter, sealed. To optimize the degradation of organic matter, we followed the evolution of the degradation of organic matter by measuring the CDO, the volume of biogas formed during the digestion, the temperature and the pH of the process. We found that the sludge off the wastewater treatment plant by natural lagoon is very rich in fermentable and biodegradable organic material than the proportion of fermentable material of the landfill. The biogas formed is flammable, so very rich in methane.The volume of biogas produced during the digestion of sludge is greater than 10 times compared with the digestion of organic matter in the landfill. Knowing beforehand that the volume of biogas produced is always a function of the residence time of digestion and the concentration of organic matter.
Abstract-Biogas production by anaerobic digestion from biodegradable organic waste is increasingly seen as a viable renewable energy source. However, the efficiency of anaerobic digestion process is limited by a number of factors affecting mainly slow hydrolysis of complex organic matter.Operating conditions and digester power supply are among the main factors affecting the biogas production. The operating conditions are pH and temperature. However, disturbances caused by the power supply include the composition of organic waste, the concentration of substrate digested and toxic compounds, digestion inhibitors which are mainly volatile fatty acids (AGV) and ammonia (NH 4 + ). Throughout this experimental study we tried to establish the relationship between the volume of biogas formed with the pH, temperature, AGV, and the production of NH 4 + .
Index Terms-Anaerobic digestion, biogas, NH 4 + , AGV.
Abstract-The most important nutrients in controlling water quality are: carbon, nitrogen and phosphorus. They are essential to the growth of all living organisms. These are the nutritional pillars of bacteria, fish, trees and humans.Unfortunately, when a water body or plan becomes rich in these nutrients, particularly phosphorus, this causes some organisms such as algae to grow in abundance which makes the environment ugly. These algae are usually undesirable and may inevitably cause changes in pH, dissolved oxygen, colour and turbidity of the water environment, hence the environment becomes eutrophic and its color turns to green.To address and solve the eutrophication issue, the amount of phosphorus discharged into the receiving milieu must be reduced; and this constitutes the main purpose of our research.We proceeded so as to make a physico-chemical phosphorus removal from urban waste water. The physico-chemical treatment is based on looking for and finding the optimal dose of the various added coagulants.The aim of our work is to confirm the efficiency of the chemical treatment through use: lime, ferric chloride and aluminum sulfate as coagulant for this treatment.
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