The Client's Needs
A study was completed in June 2004 to determine the client’s future needs and to ensure conformity with the provincial requirements (15 mg/L BOD5, 15 mg/L TSS, 0.08 mg/L TP and 5 mg/L ammonia). The results of the study indicated that an upgrade to a secondary level of treatment was necessary, as well as a capacity increase. With the anticipated growth in the community taken into account, new plant design values of 95 000 m3/d average daily flow 193 000 m3/d peak daily flow were taken into consideration.
The Solution
One of the secondary treatment technologies considered by the design team was the BIOSTYR® biological aerated filtration process provided by Veolia Water Technologies Canada. In order to confidently select a suitable technology for this application, a pilot study was performed at the Ravensview WPCP site. After evaluating the results of the pilot study, the BIOSTYR® process was selected as the best technology for this application. Some of the advantages of the BIOSTYR® process include its ability to provide a high level of treatment in a very compact footprint, as well as reduced operating and maintenance costs when compared to conventional treatment technologies.
The Client
The Ravensview Water Pollution Control Plant (WPCP) provided primary level treatment for wastewater from the City of Kingston (including Pittsburgh Township and the Canadian Armed Forces Base located in Kingston). The former process at Ravensview WPCP included: mechanical screening for pre-treatment, primary treatment with chemical enhancement, sodium hypochlorite dosing for disinfection and sodium bisulphite dosing for dechlorination. The treated effluent was then discharged into the St. Lawrence River.