Abstract
This paper reports the development of a reactor using the continuous removal of suspended solids and settling sludges in the aeration tank and activating the metabolism of aerobic microorganisms without using return sludge. Until now, treatments of high BOD concentration like livestock wastewater are diluted with water to meet the low BOD loading of activated sludge systems. Particularly, the regulation of oxygen requirements has caused great difficulties to the treatment mechanisms. Hence, to solve many problems of the activated-sludge process, authors suggested a new model in conjunction with aeration systems. This system is characterized by utilizing intensive aeration pipe with inlets at the lower portion and outlets at the higher portion. Also, to supply oxygen-transfer necessary for bacterial growth, the mixed liquid from the multiple outlets at the upper part of the aeration pipe is trickled and distributed to the liquid surface. As a result, the dense bubbles produced from the intensive aeration pipe are transferred to the settling tank and the organic materials coagulated in bubbles are settled and removed. Then, the dissolved organic materials returned to aeration tank are retreated on aerobic conditions. Consequently, the BOD concentration of swine wastewater in the aeration tank is reduced rapidly.
