ayman dohdoh | Zagazig University (original) (raw)
Papers by ayman dohdoh
The objective of anaerobic digester start-up is to achieve steady-state operation and the require... more The objective of anaerobic digester start-up is to achieve steady-state operation and the required reduction performance in the shortest possible time. The present study aims to assess a novel strategy to start-up pilot scale mesophilic anaerobic digester with internal inoculums; the operational parameters such as feed concentration and operating temperature were also evaluated. Three pilot scale anaerobic digester systems were designed and manufactured. They were equipped with all necessary instruments for measurements, operation and control. Each system consists of a feed tank, a reactor (anaerobic digester), a gas storage tank, and a displaced water collecting tank. The digester start-up was achieved successfully and smoothly without any operational problems. The feed concentration had minor effects on the performance of the digester start-up while the operating temperature has approximately no effect .
Water pollution is a challenging problem facing the human beings. In order to get treated water a... more Water pollution is a challenging problem facing the human beings. In order to get treated water and wastewater, many techniques were proposed such as floatation, coagulation, ion exchange, biological treatment, adsorption, membrane etc. Among these methods, adsorption technique has proved to be an effective and low cost manner for the removal of inorganic pollutants (i.e heavy metals), synthetic dyes and organic pollutants (i.e phenols, methylene blue, methyl orange, benzene …) from polluted water. This review summarizes the most used adsorbents such as Activated Carbon (AC), nanomaterials, natural adsorbents, industrial by-products, agricultural wastes and bio-sorbents and their performance, cost and regeneration studies. This review also discusses the mechanism of adsorption, kinetics and isotherms used in adsorption process. The effect of binary and ternary systems of ions was also discussed. The difference between batch mood and continuous flow mood (packed bed column studies) a...
Sustainability
The current study presents a detailed evaluation and comparison between two integrated anaerobic–... more The current study presents a detailed evaluation and comparison between two integrated anaerobic–aerobic systems for biological wastewater treatment under equal conditions in all aspects (wastewater characteristics, climatic conditions, reactor sizing, and even the measurement methods). The two examined systems are (i) a hybrid upflow anaerobic sludge blanket (hybrid UASB) coupled with integrated fixed-film activated sludge (IFAS) and (ii) a conventional UASB coupled with activated sludge (AS). The present comparative study aims to evaluate and assess the effect of adding carrier-filling media on the performance of the classical integrated UASB-AS. The two parallel pilot-scale systems, hybrid UASB-IFAS and UASB-AS, were installed and operated at a wastewater treatment plant. Three sets of experiments were conducted to examine the influence of the hydraulic retention time (HRT) on the consequent organic and hydraulic loads, temperature, and recirculation rate of the proposed systems....
Environment Protection Engineering
The objective of anaerobic digester start-up is to achieve steady-state operation and the require... more The objective of anaerobic digester start-up is to achieve steady-state operation and the required reduction performance in the shortest possible time. The present study aims to assess a novel strategy to start-up pilot scale mesophilic anaerobic digester with internal inoculums; the operational parameters such as feed concentration and operating temperature were also evaluated. Three pilot scale anaerobic digester systems were designed and manufactured. They were equipped with all necessary instruments for measurements, operation and control. Each system consists of a feed tank, a reactor (anaerobic digester), a gas storage tank, and a displaced water collecting tank. The digester start-up was achieved successfully and smoothly without any operational problems. The feed concentration had minor effects on the performance of the digester start-up while the operating temperature has approximately no effect.
The objective of anaerobic digester start-up is to achieve steady-state operation and the require... more The objective of anaerobic digester start-up is to achieve steady-state operation and the required reduction performance in the shortest possible time. The present study aims to assess a novel strategy to start-up pilot scale mesophilic anaerobic digester with internal inoculums; the operational parameters such as feed concentration and operating temperature were also evaluated. Three pilot scale anaerobic digester systems were designed and manufactured. They were equipped with all necessary instruments for measurements, operation and control. Each system consists of a feed tank, a reactor (anaerobic digester), a gas storage tank, and a displaced water collecting tank. The digester start-up was achieved successfully and smoothly without any operational problems. The feed concentration had minor effects on the performance of the digester start-up while the operating temperature has approximately no effect .
Water pollution is a challenging problem facing the human beings. In order to get treated water a... more Water pollution is a challenging problem facing the human beings. In order to get treated water and wastewater, many techniques were proposed such as floatation, coagulation, ion exchange, biological treatment, adsorption, membrane etc. Among these methods, adsorption technique has proved to be an effective and low cost manner for the removal of inorganic pollutants (i.e heavy metals), synthetic dyes and organic pollutants (i.e phenols, methylene blue, methyl orange, benzene …) from polluted water. This review summarizes the most used adsorbents such as Activated Carbon (AC), nanomaterials, natural adsorbents, industrial by-products, agricultural wastes and bio-sorbents and their performance, cost and regeneration studies. This review also discusses the mechanism of adsorption, kinetics and isotherms used in adsorption process. The effect of binary and ternary systems of ions was also discussed. The difference between batch mood and continuous flow mood (packed bed column studies) a...
Sustainability
The current study presents a detailed evaluation and comparison between two integrated anaerobic–... more The current study presents a detailed evaluation and comparison between two integrated anaerobic–aerobic systems for biological wastewater treatment under equal conditions in all aspects (wastewater characteristics, climatic conditions, reactor sizing, and even the measurement methods). The two examined systems are (i) a hybrid upflow anaerobic sludge blanket (hybrid UASB) coupled with integrated fixed-film activated sludge (IFAS) and (ii) a conventional UASB coupled with activated sludge (AS). The present comparative study aims to evaluate and assess the effect of adding carrier-filling media on the performance of the classical integrated UASB-AS. The two parallel pilot-scale systems, hybrid UASB-IFAS and UASB-AS, were installed and operated at a wastewater treatment plant. Three sets of experiments were conducted to examine the influence of the hydraulic retention time (HRT) on the consequent organic and hydraulic loads, temperature, and recirculation rate of the proposed systems....
Environment Protection Engineering
The objective of anaerobic digester start-up is to achieve steady-state operation and the require... more The objective of anaerobic digester start-up is to achieve steady-state operation and the required reduction performance in the shortest possible time. The present study aims to assess a novel strategy to start-up pilot scale mesophilic anaerobic digester with internal inoculums; the operational parameters such as feed concentration and operating temperature were also evaluated. Three pilot scale anaerobic digester systems were designed and manufactured. They were equipped with all necessary instruments for measurements, operation and control. Each system consists of a feed tank, a reactor (anaerobic digester), a gas storage tank, and a displaced water collecting tank. The digester start-up was achieved successfully and smoothly without any operational problems. The feed concentration had minor effects on the performance of the digester start-up while the operating temperature has approximately no effect.