Thinking Inside the Box

摘要

Greenville, N.H., located west of Nashua, N.H., and about 10 miles (16 km) from the Massachusetts border, experiences cold winter temperatures-typically in the teens (Fahrenheit). These frigid winters created maintenance problems for the wastewater treatment plant staff. The plant's two chemical feed systems were housed outdoors, and the extreme cold would freeze the lime-slurry solution and made it difficult to transport 55-gal (208-L) drums of polyaluminum chloride across frozen terrain. The freezing led to process upsets and the potential for compliance exceedences on the plant's discharge.