Abstract
Ensuring high quality drinking water sources is important task nowadays. To reach this task, knowledge about the impact of different chemicals on aerobic wastewater treatment is mandatory. A mixture of different chemicals reaches wastewater treatment plant every day. With the growing discharge volume of mobile toilet chemicals, active substances in these products in the past years have been recorded. The respiratory activity of activated sludge was determined to show how mobile toilet chemicals and their active substances may affect the biological wastewater treatment process. The results show negative effect of formaldehyde and bronopol on respiratory activity of activated sludge. The wastewater treatment plants influent composition and size also play important roles. Results shows that activated sludge microorganisms at a wastewater treatment plant in industrial urban area may be adapted to the higher pollutants concentration. When mobile toilet tanks are directly discharged at smaller wastewater treatment plant, an activated sludge process can be affected. For treating mobile toilet wastewater, bacterial degraders can be used. During our respiratory activity experiments, potential degraders were searched. Ralstonia sp. prevails in all samples and it is therefore a potential mobile toilet chemicals degrader.
Highlights
Safe and readily available water is important for public health, whether it is used for drinking, domestic use, food production, or recreational purposes
Our results show that the concentration of mobile toilet chemicals in the wastewater affected the respiratory of the microorganisms the activated sludge
Mobile toilet chemicals can pose a risk to biological wastewater treatment
Summary
Safe and readily available water is important for public health, whether it is used for drinking, domestic use, food production, or recreational purposes. Wastewater treatment can be affected by many different substances, which can be discharged to the sewer system or directly at the wastewater treatment plant. This is important in small wastewater treatment operations for which side-streams might constitute a significant portion of influent. One group of chemical substances with a possible impact on the activated sludge process during sewage treatment can be found in cesspools and septic tanks, and during the servicing of chemical toilets. Mobile toilets are used in recreation vehicles, boats, recreational facilities, etc. For this reason, wastewater is burdened more and more. Production from other sources (cesspools, septic tanks and chemical toilets) can represent, in connection with
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