There is an urgent need that all possible sources of inexpensive adsorbents should be explored and their feasibility for the removal of heavy metals. Thus, this study presents application of low-cost adsorbents agro-based wastes, such as rice husk and their utilization possibilities for elimination of heavy metals; Fe (II) and Pb (II) from wastewater by the adsorption process.The adsorption technique was used for the removal of Fe 2+ and Pb 2+ in two drains (Khashaa drain and Tera drain) which are discharged into Burullus Lake.The obtained results showed that, the adsorption of the metal ions was adsorbent dosage, adsorbate concentration, contact time and pH dependent. The optimum contact time, adsorbent dosage, and pH were found to be at 105 min, 8 g and pH 8, respectively, for Fe 2+ and at 40 min, 8 g and pH 8, respectively, for Pb 2+ . Freundlich isotherm model was found to be the best fit most suitable for each of heavy metals at R 2 = 0.96, 0.91. Kinetic studies showed that pseudo-second-order reaction model best described the adsorption process.The results revealed also a good removal of Fe 2+ and Pb 2+ using rice husk under optimum conditions with removal percentage 91.36% and 94.42% for Fe 2+ , respectively and Pb 2+ in Khashaa drain and 93.56% and 90.93% for Fe 2+ and Pb 2+ , respectively in Tera drain.Therefore, the study showed that rice husk can be efficiently used as low cost alternative for removal of metal ions.

The current investigation entails the application of an electrocoagulation treatment process to the kitchens' wastewaters discharged from five of the most popular restaurants in New Damietta city -Egypt. The electrocoagulation process was carried out using aluminum electrodes at variable electrolysis times. The specifications of the applied system were; pH 7.03, temperature 25ºc, distance between the two used electrodes 20 mm, the applied current 1 ampere, voltage 20 volt, current density 40 mA/cm 2 , plate shape of the electrode, and dimensions of 100 mm x 50 mm x 0.095 mm, with a surface area of 25 cm 2 for each electrode. The system was investigated to treat the food processing effluents of the restaurants prior to their discharge to the public sanitary network, in order to comply with the Egyptian Environmental Regulation (Decree 44/2000) of the wastewaters discharged to the public sewer system. Total operating cost including the energy and electrode consumption, and theoretical amount of hydrogen gas produced were calculated. The results revealed good removal efficiency percentages, especially for the removal of organic matters. The COD removal efficiency for the restaurants 1, 2, 3, 4 and 5 were 84.6, 74.5, 89.15, 68.5, and 92.79%, respectively. At the same time, oil & grease was almost fully removed from the wastewater of the restaurants 1 and 2, while restaurants 3, 4, and 5 had a very good removal efficiency percentage of 92.42, 94.5, and 87.76%, respectively.

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The objective of this study is to assess the influence of particulates generated by traffic on air quality of the urban area in Damietta City, Egypt. In this study, particulate concentrations had demonstrated in the atmosphere of seven locations in the city, through year 2018 and comparing with the data of year 2009. The chemical characteristics of particulate components (SO4 2-, NH4 + , NO3 -, NO2and Cl -) had also investigated for the sampling locations. It indicated that about 100 % of the measured samples exceeded Egyptian ambient air quality standard (90 g/m 3 /year). The air quality index (AQI) of traffic and residential areas in Damietta City with respect to suspended particulate matter (SPM) shows a significant improvement of air quality during the period of 2018, compared with the concentrations during the period of 2009, which indicated extreme air pollution at that period. Whereas the main compounds in SPM in the city follow the order: (NH4)2SO4> NH4NO3. These results clarify that the reaction between NOx, SO2 and ammonia gases might be emitted from auto-exhaust.