Optimizing Treatment of Cesspool Wastewater at an Activated Sludge Plant

Abstract

The purpose of this work was to determine the optimal percentage of wastewater from cesspool in the mixture of wastes subjected to treatment processes, which will not have a negative impact on the functioning of the collective treatment plant. The study was carried out over a period of two years, with 48 samples of wastewater flowing in from the sewage network and delivered with the slurry tanker collected and subjected to physical and chemical analysis. The analysis included: Biochemical Oxygen Demand (BOD5), Chemical Oxygen Demand (COD), and Total Nitrogen (TN). In addition, the study defined the daily balance of the amount of inflowing and transported wastewater. Based on the analysis carried out, it was found that the unit loads of BOD5, COD and TN in the mixture of wastewater subjected to the treatment process will be at the level of loads assumed in the project, when the share of supplied wastewater, i.e., from cesspool, will be at the level of 5% of the total amount of wastewater. Considering that in the analysed period the total average daily amount of wastewater subjected to the treatment process was 253.5 m3·d−1, the optimal amount of wastewater delivered should be 12.7 m3 in each day of the week.

Impact of Climate Conditions on Pollutant Concentrations in the Effluent from a One-Stage Constructed Wetland: A Case Study

“…Given the specific manner in which domestic wastewater treatment plants operate, they should have an uncomplicated structure and be characterized by a high wastewater treatment efficiency. Off-grid sewage systems for single-family homes (other than cesspools [12]) most often consist of a septic tank with a soakaway system for infiltrating wastewater into the ground (a drainfield), or containerized plants with a biological treatment unit that use the activated sludge process. Neither of these two types of systems guarantee the efficient removal of pollutants from wastewater [10,[13][14][15].…”

Characteristics and Resource Recovery Strategies of Solid Waste in Sewerage Systems

“…The traditional method of disposal of solid waste from facilities in developing countries is to transport it to landfills. Transportation and landfilling of such solid waste may pose an environmental risk due to its complex composition and a certain quantity of pollutants [4,5]. Traditional treatment and disposal methods are no longer viable due to the steady increase in the requirements for environmental protection, and recycling methods suitable for solid waste in developing countries need to be studied.…”