|
The Wastewater Treatment Division of Environmental Management Services operates and maintains water and wastewater services for the Aerotech Industrial Park and Halifax International Airport area. Aerotech Park officially opened in 1987.
Water Treatment:
 This facility designed by Gore and Storrie is capable of producing 1.7 million gallons/day of domestic water. As raw water from Bennery Lake enters the main treatment plant, lime and carbon dioxide are added to adjust the pH and reduce aggressiveness (corrosive tendency) of the water. A coagulation process is initiated by the addition of alum (aluminum sulfate) which forms a chemical precipitate or floc. The flocculation process is accomplished by a series of slow mixing baffled tanks which allow the coagulated particles to gather into larger settleable particles. The process flow proceeds to a clarifier to allow settling of heavier floc and suspended particles.The filtration stage then removes remaining floc, and remaining impurities (silt, bacteria, plankton) by passing the water downward through a bed of anthracite (3'), sand (3'), and fine gravel (3'). Following filtration, chlorine is added to the treated water for disinfection purposes. Any pathogenic bacteria present are destroyed. A small amount of sodium carbonate or sodium hydroxide is applied for final pH correction.
Wastewater Treatment
The Aerotech WPCP, designed by Porter Dillion Ltd., is a 300,000 gpd secondary treatment process consisting of preliminary treatment, primary clarification, rotating biological contactors, secondary clarifiers, and post chlorination. Other features include aerobic sludge digestion, nitrification, and phosphorus removal. Plant effluent is discharged to the Johnson River system.
Aerotech Biosolids Lagoon
 This facility was designed by CBCL Ltd. and commissioned in 1989. Approximately 3 million gallons of the Halifax Regional Municipality treatment plant digested sludges and 3 million gallons of home septic tank wastes are transported and deposited at this location each year. The 7 million gallon capacity allows the biosolids to further reduce and stabilize by anaerobic and facultative microbial action. On site staff monitor all discharges by means of a waybill system and effluent analyses in order to ensure regulatory and HRM compliance standards.Effluent or displaced liquid from the Biosolids Lagoon is further treated at the Aerotech Park Water Pollution Control Plant prior to discharge.
Biosolids Transport
HRM operates and maintains a 5,000 gallon tractor-trailer unit for the purpose of transporting treated biosolids (sludge) from HRM treatment plants to the Aerotech Lagoon.
|
