Removal of Biochemical Oxygen Demand by Root Zone Treatment Technology from Domestic Sewage

Abstract

Nowadays natural wastewater treatment technologies gain more significance. Root zone treatment technology for domestic sewage wastewater treatment has been proven to be effective and sustainable alternative for various conventional wastewater technologies. Increasing urbanization and human activities exploit and affect the quality and quantity of the water resources; this has been resulted in pollution of fresh water bodies. Due to increased use of water and thus release of domestic sewage. Treatment of domestic sewage is necessary to ensure that the receiving water into which the effluent is finally discharged is not significantly polluted. During 2015, the estimated sewage generation in India was 61754 MLD as against the developed sewage treatment capacity of 22963 MLD. Because of the hiatus in sewage treatment capacity, about 38791 MLD of untreated sewage (62% of the total sewage) is discharged directly into nearby water bodies (CPCB 2016). As still we had not developed a planned strategy for waste water treatment completely. Constructed wetlands have been developed for domestic sewage treatment. This technique exploits the natural ability of the reeds to transfer large quantities of oxygen from the atmosphere to its root zone. Where a variety of bacteria in the soil effect biological removal of pollutants. The objective of this study is to install pilot scale Root zone treatment system to treat domestic sewage by using an aquatic macrophyte Phragmites Australis. In the present investigation water samples were collected seasonally for the period of two years and treated it with Root zone treatment system, both influent and effluent samples were taken for BOD analysis. The maximum
BOD reduction found 72.83 % in the winter season and the minimum BOD reduction found 59.66 % in the summer season