Meeting House Wastewater Treatment Plant

Meeting House Wastewater Treatment Plant

Ground Water Protection Community Removes Total Nitrogen

Twenty miles northwest of Boston the rural town of Stow, Massachusetts is home to the Meeting House at Stow Elderly Care Community. When the facilities’ previous wastewater
treatment plant failed to meet permit for a prolonged period, the Massachusetts Department of Environmental Protection (MADEP) issued an administrative consent order (ACO) requiring the facility to correct its non‐compliant discharge to the ground water.

The solution was to replace the failed activated sludge based process with a more robust and reliable fixed film process. The new system was permitted under Massachusetts Groundwater Discharge (GWD) pollution control regulations requiring the system to meet a standard of < 10 mg/l total nitrogen. The project engineer Martinage Engineering Associates, Inc. selected an AquaPoint Bioclere™ treatment system for its proven nitrification & denitrification performance capability, energy efficiency and low life cycle costs. In order to retain heat in the process and enhance removal efficiencies, the Bioclere trickling filters are ventilated with warm air from the process control building. Effluent from the biological process is polished through a sand filter and UV disinfection prior to groundwater discharge.

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Design Characteristics

Influent Effluent
 DESIGN FLOW (GPD)  12,000  12,000
DESIGN TEMP (C) 10
BOD5 (mg/l) 250 < 30
TSS (mg/l) 250 < 30
TKN (mg/l) 65
AMMONIA‐N (mg/l) 50 < 2
NITRATE‐N (mg/l) < 5
TOTAL‐N (mg/l) > 10
FECAL (MPN/100ml) < 200

Performance Data

2012 BOD5 (mg/l) TSS (mg/l) Nh3 (mg/l)
JAN  6 3 4.07
FEB 9.3 10.5 3.74
MAR 6 4 2.31
APR 6.6 6 4.44
MAY 21.6 11 3.58
JUN 7.8 2 3.63
JUL 6 4 3.63
AUG 13.1 2 3.42
SEP 16.8 4.5 3.75
OCT 18 8.5 4.21
NOV 12.8 5 1
DEC 2 2 6.19
AVERAGE 10.5 5.2 3.7

System Diagram