Performance of Organic overloaded WWTP Comprise Primary followed by Secondary Attached Growth Biological Treatment- Case Study

Abstract

The Egyptian government faces big challenges to cover rural areas with conventional wastewater treatment systems due to shortage of financial resources. Cascade aerators consist of a series of steps that the water flows over. In all cascade aerators, aeration is accomplished in the splash zones. The aeration action is similar to a flowing stream. Splash areas are created by placing blocks across the incline. The current research aims to examine the performance of a low cost compact sewage treatment unit that employs an integrated aerobic system which is easy to implement and operate and producing effluent wastewater quality complying with Egyptian law 48 for year 82. Initially, Bordain wastewater treatment plant is located in Sharkia governorate, Egypt. It includes UASB unit preceded by screen and grit removal chamber and followed by trickling filter with final clarifier. The main problem of this WWTP is concluded in high level of COD effluent concentration, in addition to zero level of dissolved oxygen. The present research aims to improve COD removal ratio and dissolved oxygen concentration at the effluent samples. A cascade tower was added in the channel between UASB and trickling filter in addition to recirculation submerged pump. Water samples were collected from the influent and effluent of WWTP. Results indicated that, Low COD effluent concentration was achieved. COD removal ratio measured was ranged between 70 - 75%, In comparison with 25 – 30 % at the first and also high level of dissolved oxygen concentration was recorded.