Effect of Hydraulic Retention Time on Nitrification in an AirLift Biological Reactor

Abstract

The occurrence of nitrogenous compounds in industrial effluents at concentration levels above legal limits, is a well-known and serious pollution problem for the receiving body. The biological process for the removal of these substances, commonly referred to as ammoniacal nitrogen, is known as nitrification. Bacteria involved are mainly of the genuses Nitrosomonas and Nitrobacter. The aim of the present work was to study the effect of the hydraulic retention time (HRT) on the efficiency of ammonia removal from a petroleum refinery effluent using activated carbon particles as a biofilm support in an airlift bioreactor. The experiments were carried out using HRTs, equal to six, eight and ten hours. The results show that HRT equal to 8 and 10 hours were enough to reduce ammoniacal nitrogen concentration to levels below permited legal limits (5mg/L NH3-N). The reactor nitrifying performance was maximized at 85% removal of ammoniacal nitrogen, for a HRT equal to 10 hours

Effects of Solid Waste and Industrial Effluents on Water Quality of Turag River at Konabari Industrial Area, Gazipur, Bangladesh

“…Despite its importance, water is the most poorly managed resource in the world (Fakayode, 2005). The existing tendency of industrialization and urbanization may contribute greatly to the poor quality of water through indiscriminate disposal of solid waste, industrial effluents and other toxic wastes which are the major environmental issues posing threats to the existence of human being (Furtado et al, 1998;Chindah et al, 2004;Ugochukwu, 2004;Emongor et al, 2005;Rahman et al, 2008). The concentrations of chemical parameters of industrial effluent were above the allowable limits and also tended to accumulate at the downstream area (Fakayode, 2005).…”

Assessment of the impact of industrial effluents on water quality of receiving rivers in urban areas of Malawi

“…In farming areas, the routine application of agricultural fertilizers is the major source (Altman and Parizek, 1995;Emongor et al, 2005). In urban areas, the careless disposal of industrial effluents and other wastes may contribute greatly to the poor quality of the water (Chindah et al, 2004;Emongor et al, 2005;Furtado et al, 1998 andUgochukwu, 2004). A study on the impact of industrial effluent on water quality of a river carried out in Nigeria (Fakayode, 2005) showed that the chemical parameters studied were above the allowable limits and also tended to accumulate downstream.…”

Design and implementation of remotely Tigris river water monitoring system in Baghdad

“…The statistics said that approximately 5 million deaths per year are occurred due to water pollution diseases. Major environmental issues that threat the human life are occur due to the existing tendency of industrialization and urbanization whichresulting of poor quality of water due to the industrial effluents [2][3][4]. In the last 20 years, water sources in Iraq have witnessed a significant deterioration from air pollution to soil and water pollution water sources due to lack of attention.…”