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Coffee is present in every street in the world and is without a doubt one of the most consumed beverages. Moreover, it is the third most consumed drink in the world. Recent estimations from the International Coffee Organization put. The world coffee production at about 6 million tons per year. Its uncontrolled disposal can cause environmental problems, but if handled properly, it can be processed into pellets, and used as an energy source. In the present study, the production of energy from coffee waste (CW) is an interesting alternative to traditional production lines. The objective of this study is to calculate the energetic potential (Ep), which can be generated by anaerobic digestion (AD) and thermochemical conversion (TC), of the organic fraction of CW in the city of Kenitra, Morocco. An elementary analysis allows us to estimate the calorific value by the TC. The lower and higher calorific values were estimated to be: 18.71 and 20.28 MJ/Kg, respectively. Ep results by AD and CT were 0.25 and 1.3 MWh/t, respectively. [ABSTRACT FROM AUTHOR]

The objective of this study is to recover sludge from the Dar Gueddari sewage treatment plant and use it in the cultivation of corn in the open field on clay soil. To do this, four doses were tested against two types of controls: a control without addition of sludge and another with the addition of nitrogen-based fertilisers (200 kg N, 100 kg P and 100 kg K). The short-term effects indicated that the application of the sludge had a beneficial effect on the fertilising qualities of the soil and therefore on the crop yield. The monitoring of the agronomic parameters of the maize plant showed that the growths and the yields varied according to doses of the sludge. In grain yield, the difference between plot E4 and E0 was around 3.3 Mg∙ha-1. In addition, the plots treated with large sludge doses experienced improvements in total nitrogen and organic matter. During the second season, the results obtained showed decrease in nutrients (nitrogen and phosphorus). It emerged from the C:N ratio which was <8. This indicated a good mineralisation of the organic matter (OM) which was average of 2.48 ±0.04% and 2.5 ±0.01%, respectively in the E4 and E5 treatments. In addition, the amounts of N, P and Ca in dry matter (DM) increased with increasing the dose of sludge. During the 2017 season, the highest values were detected in plot E5 with averages of 1.6% in N and 0.53% in P. [ABSTRACT FROM AUTHOR]

The physico-chemical characterization of the leachate from the Technical Landfill Center (TLC) of Moulay Abdallah (MA) which is intended for the treatment of Household Waste (HW) and Waste Assimilated to Household Waste (HWA) as well as the elaboration of the results of the study that was carried out on the leachate from the Oum Azza (OA) Technical Landfill allowed comparing the leachate from two TLCs located in two different regions and exploited in two different ways. The parameters studied are Organic Matter (OM), Chemical Oxygen Demand (COD), Biological Oxygen Demand (BOD5), Total Kjeldahl Nitrogen (TKN) concentration, NH4+ ion concentration, conductivity, Suspended Solids (SS), Total Phosphorus (TP) and pH. The choice of these parameters comes down to their usefulness for the sizing of the leachate purification processes (PP) of the leachates of Moroccan typology, produced by the population of a coastal city. The results of the analyses show that the leachates from the two TLCs have almost the same physico-chemical characteristics. Depending on the method of management of the leachate (storage or direct discharge to the wastewater treatment plant (WWTP)), the evolution over time of these characteristics differed from one TLC to the other and all of the main leachate parameters from the TLC MA have all tended to increase over the time of operation. This is in contrast to the leachate parameters from the OA TLC, which all tended to decrease. [ABSTRACT FROM AUTHOR]

This study determined and monitored the halogenated disinfection by-products (DBP) of natural waters used to produce drinking water for the City of Casablanca, Morocco. The natural water physicochemical parameters were first monitored to characterize these waters; chlorine requirements were determined by plotting the break point curve. Then waters were synthesized in a laboratory, based on the results of previous analyses. The break point curves of these synthetic waters were also determined. To assess the consequences of chlorination, monitoring tests determined the trihalomethane (THM) and the halogenated organic compounds (COX) out before and after coagulation. Results for natural waters showed a correlation between total organic carbon (TOC), the THM contents and type as well as the COX formed following chlorination. Results thus showed that coagulation before chlorination helped reduce the formation of disinfection byproducts. Key words: surface water, disinfection, chlorination, coagulation, trihalomethane, THM, halogenated organic compound, COX. Cette etude visait la determination et le suivi des sous-produits de desinfection (SPD) halogenes des eaux naturelles servant a la production d'eau potable de la ville de Casablanca au Maroc. Dans un premier temps, un suivi des parametres physicochimiques des eaux naturelles a ete effectue dans le but de caracteriser ces eaux, pour lesquelles la demande en chlore a ete determinee a partir du tracage de la courbe de point de rupture (<< break point >>). Dans un deuxieme temps, des eaux ont ete synthetisees au laboratoire, sur la base des resultats des analyses effectuees precedemment. Ces eaux synthetiques ont fait l'objet, elles aussi, de la determination des courbes de point de rupture. Afin d'evaluer les consequences de la chloration, des tests de suivi des trihalomethanes (THM) et des composes organohalogenes (COX), avant et apres coagulation ont ete effectues. Les resultats obtenus pour les eaux naturelles ont montre une correlation entre le carbone organique total (COT), la teneur et la nature des THM et les COX formes suite a la chloration. Aussi, les resultats ont montre que la coagulation avant chloration permet de reduire la formation de SPD. Mots-cles: eau de surface, desinfection, chloration, coagulation, trihalomethane, THM, compose organohalogeene, COX., Introduction Au Maroc, l'alimentation en eau potable se fait en majoritee par les eaux de surface. Le tableau 1 illustre d'ailleurs la repartition geographique des ressources en eaux de surface [...]

In this work, we have synthesized the surfactant compounds derived from 2-(NAlkyl-3-methyl-1,2,4-triazolthioyl) acetic acid (MTSACCn; n=10, n=11 and n=12). These compounds have been purified and identified using several spectroscopic methods such as ¹H NMR; 13C NMR spectroscopy. The molecular aggregation of MTSACCn has been foxed using tensiometer apparatus. The electrochemical study was carried out using a coupling of potentiodynamic and electrochemical impedance methods. The polarization curves indicate that the MTSACCn act as mixed-type inhibitors of carbon steel in ¹M HCl solution. The electrochemical impedance spectroscopy measurements showed that all synthesized compounds act by establishing a barrier layer on the steel surface. Therefore, we noted that the inhibition efficiency increases with increasing of concentrations inhibitors. Also, the MTSACC12 is the best inhibitor, its inhibition efficiency reached a maximum value of 95% at 510-4 M. The adsorption of all surfactants studied follows the Langmuir isotherm. [ABSTRACT FROM AUTHOR]

The presence of heavy metals in the environment, resulting from industrial wastewater discharges, causes considerable damage to the natural balance of the aquatic ecosystem when they exceed certain concentrations. During this study, we were able to eliminate the content of Ni2+ ions contained in synthetic wastewater samples by the adsorption technique on a hull substrate taken from the beaches of Mehdia in Morocco. The present study indicates that the envisaged adsorption decreased the efficiency of the retention of Ni2+ ions from 91.03% (6.5 ppm) to 52.36 (250 ppm) and the adsorption capacity of 13.67%. mg / g for 200 ppm. The mass effect of the adsorbent was of the order of 84.8% for a value of 2 g, the temperature was of the order of 95% for 328±2 K. and a yield of 89.15% for a pH of between 6 and 7 and of the order of 93.5% for a contact time of 180 min. [ABSTRACT FROM AUTHOR]