Kinetic analysis of organic matter removal in stabilization pond in the wastewater treatment plant of Birjand

Abstract

Background and objectives: natural wastewater treatment systems also have the advantage of low-tech and high-performance but rely to natural and renewable energy such as solar radiation, wind energy and energy storage in biomass and soils. The study of natural wastewater treatment systems in terms of physical, hydraulic, process in the real scale and determine the strengths and weaknesses of this system by using scientific and practical models, Can be an important and effective role for the construction of other similar units in world and our country that these systems has not yet flourished. In wastewater, the removal of organic matter is the primary goal of the system design, Methods: This study investigated the kinetics of biological reactions in the removal of organic substances in stabilization ponds. Wastewater is from three points, stabilization ponds (input wastewater to plant) (input to the anaerobic pond) output wastewater of anaerobic pond and output wastewater of maturation pond) each month until 6 months Organic materials with COD, BOD5 were measured according to the water and wastewater examinations. Results: The average of output concentration for COD, BOD5 in anaerobic ponds and maturation pond is Respectively 307, 135.18 mg / l and 69.025,136.75, mg / l. The models are First-order substrate removal model, Second-order substrate removal model (Grau model) and Stover Kincannon Model. Models were analyzed by using statistical parameters. Results: To increase efficiency and uniform elimination (no sharp fluctuations) of different parameters requires to proper operation and guiding principles. To predict removal of organic matter, Stover - Kincannon Model provided the nearest mathematical relationship between the theory predictions and actual field data in natural wastewater treatment systems. The wastewater treatment plant of Birjand has created a situation that led to a dramatic reduction of pollution are the main parameters.