Integrating anaerobic processes into wastewater treatment

摘要

Over the past decade, the concept of anaerobic processes for the treatment of low temperaturendomestic wastewater has been introduced. This paper uses a developed wastewater flowsheetnmodel and experimental data from several pilot scale studies to establish the impact of integratingnanaerobic process into the wastewater flowsheet. The results demonstrate that, by integrating annexpanded granular sludge blanket reactor to treat settled wastewater upstream of the activatednsludge process, an immediate reduction in imported electricity of 62.5% may be achieved for antreated flow of c. 10,000 m3 du00021. This proposed modification to the flowsheet offers potentialnsynergies with novel unit processes including physico-chemical ammonia removal and dissolvednmethane recovery. Incorporating either of these unit operations can potentially further improventhe flowsheet net energy balance to between þ0.037 and þ0.078 kWh mu00023 of produced water.nThe impact of these secondary unit operations is significant as it is this contribution to the netnenergy balance that facilitates the shift from energy negative to energy positive wastewaterntreatment.