Grey water is considered a type of wastewater which bring damage to human health and environmental if disposed improperly. This lead to research an efficient treatment method to reduce the damage. The methodology used for grey water treatment was ozonation and ultra sonication. PH, ozone dose, temperature and time were the factors effecting the overall performance of the treatment process for the two forms of grey water(car wash water and Domestic water). both the COD & oil content were measured to determine the effectiveness of the process. for carwash sample, the COD and oil content were 95%,96.5% at 0.52 mg/l ozone dose, at 55 min duration time and ph=9. As for the domestic water, the COD and oil content were 96.5%,96% at 0.52 mg/l ozone dose, at 55 min duration time and ph=9. The removal was lower for ultrasoniation.for carwash sample, the COD and oil content were 94% and 74% at 45Co, at 55 min duration time and ph=9. As for the domestic water, the COD and oil content were 97% and 96 % at 55 min duration time and ph=9. Finally, treatment of greywater with ozone has proven to be more efficient than ultrasound

Leachate is a complex solution of contaminants produced from municipal waste compacting stations, being primarily comprised of household waste. In this research, leachate was treated in an electrochemical batch process with a dissolved air floatation system using aluminium as the anode with cathode electrodes. Conditions such as pH, current density (i), contact time, and air flowrate were varied and tested to determine their effects on the removal efficiency in terms of Chemical Oxygen Demand (COD), Oil, and Turbidity (Turb.). Under the best conditions, the removal efficiencies for oil, COD, and turbidity were 78.7%, 77.5%, and 98.6%, respectively, suggesting that this method can be considered an efficient and effctive treatment for leachate.

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Membrane Bio Reactor(MBR) methods is considered as one of the most advanced used technology in waste water treatment. The aim of this technology is to obtain high quality treated waste water. This study conducted to investigate the ability of using of sewage water from zaafrania city for irrigation and their effect on corn growth and some of soil chemical properties which include electrical conductivity and soil pH in extract soil paste and the micro nutrient content in soil and plant which include Fe, Mn, Zn, Cu, Cd, Pb. Three levels of wastewater were used 0, 50, 100% in two stages, the three levels of wastewater ( without soil fertilization ) were used in the first stage, where 21.8 Kg P/D +80 N Kg/D was added to the soil as fertilizer in the control 0% treatment and 10.9Kg P/D +40 Kg N/D were added to 50 and 100% levels in the second stage. Corn seeds were planted in 10kg plastic pots in Completely Randomized Block Design in three replicates. The results refer to a high significant increase in plant height, fresh and dry weight for all treatments in comparison with control treatment. The low add level of wastewater 50%+ half of fertilizer recommendation gives a significant increase of plant height and fresh and dray weight. The results showed a high increased of electrical conductivity for 50, 100% wastewater added levels for both stages compared with control treatment. The high add level 100% gives high significant increase of electrical conductivity compared with the low level of the wastewater. Whereas the values of soil PH were close to the neutral for all treatment. The result showed a significant increase in micro nutrients content (which include Fe, Mn, Zn, Cu, Cd, Pb) in soil and plant for all treatment compared with control treatment, this increased was continues with the increase of additional level of wastewater. However all the micro nutrient was within the allowed natural limits and not reached the toxic limits in soil and plant.

This study investigated the degradation of organic and inorganic matters of wastewater by conventional ozonation and ozone/UV AOPs. The experiments performed with two types of wastewater (synthetic and industrial) having the same chemical oxygen demand COD, varying solution pH and employing UV clearly showed that oxidation during ozonation process was dominated by OH reactions. Conventional ozonation with 2 g/hr maximum ozone dose led to 56% COD removal efficiency in synthetic wastewater, while 52% was estimated from industrial wastewater, both having the same initial COD value of almost 50 ppm and contact time of 80 min. In meanwhile, using UV improved the utilization efficiency of oxidation by reducing the OH scavenging contribution of oxidants, 62% and 70% were the efficiencies of industrial and synthetic respectively in ozone/UV applications. Therefore, combined ozone/AOPs shows better removal efficiency of toxic contaminants than using ozone alone.