الفهرس | Only 14 pages are availabe for public view |
Abstract Egypt and some developing countries are facing a shortage of water needs, so it is necessary to develop low cost technology to suit these countries and optimize the use of surrounding water. Achieving high efficiencies in anaerobic baffled reactor (ABR) for reducing chemical oxygen demand (COD) has always been an outstanding challenge for most researchers as most experiments focus on using fibers in ABR to reduce COD. In this paper a new material was introduced as a replacement for fibers which is the agricultural waste such as palm fibers and ficus trees. The Effect of using agricultural wastes on the performance of the (ABR) in reducing COD was tested for four different stages (start-up, steady state, shock and final). Both palm fibers and ficus trees samples achieved higher COD removal efficiency as compared to previous studies. The palm fiber samples achieved the highest COD removal efficiency in the four stages as compared to the ficus tree samples. An exploration regarding the applicability, development and possible future presentation of the an-aerobic baffled reactor (ABR) for the wastewater treatment has been carried out. The reactor design has been established since early 1980s and has several benefits compared to well-established systems. It contains, good flexibility to organic loading and hydraulic, virtuous biomass retaining time, sludge yield reduces, also capacity towards partially separate between different stages for an-aerobic process. The slow rate of changes for populations of bacteria allowing well advanced resistance to alternate the environmental parameters for instance pH and temperature and protection against contaminated materials. There are many alterations such as insertion of an-aerobic polishing stage, resulting in a reactor which can treat difficult wastewaters which now require many units, eventually expressively reducing capital cost. The main idea of the study is to investigate the behavior of these reactors and prove the use of biofilm in refining treatability, to promote the use of both type of biofilm, i.e. ficus fiber and palm fiber. Several important factors have been worked out i.e. temperature, no. of baffles in the reactor, shape of baffled and location of reactor in order to avoid lighting. For all the tested reactors, influent and effluent COD concentration, influent and effluent pH, temperature in reactor and flow rate, in all reactor stage (start-up, steady state, shock load and final stage), pH in all partition from reactors during shock load stage were examined. Results discovered the “ABR C” scenario gave the highest COD % removal as compared to other two scenarios. Simple experimental arrangement was used to see the treatability feature of synthetic wastewater. when tested under altered COD (500 - 1000 and 2000 mg/l) with flow rate 38 l/d and pH value 8.5. pH effect on treatability was explored too. |