Home » News » Public Safety
Sewage odor complaints stop in Derry, but officials monitoring plant
The strong odor was likely caused by an excessive buildup of sludge at the bottom of two lagoons over the unusually frigid winter, Tom Carrier, deputy director of Public Works, said during the Town Council meeting Tuesday night.
In late May, the smell affected Londonderry residents living in the area near Home Depot and Market Basket, Carrier said.
“Fortunately, it’s over,” he said. “We haven’t received any complaints in recent days.”
Derry’s facility is somewhat unique in the state in that it incorporates a system of two large, open lagoons to break down and treat millions of gallons of untreated sewage. Each lagoon is 20 feet deep and contains 42 million gallons. The facility is one of the largest of its kind in the country, Carrier said.
Over the winter, the biological activity decreases, and a layer of sludge builds up and falls to the bottom of the ponds to lie dormant. In the spring, as it becomes warmer, bacteria become active again and begin breaking down the waste. As this process occurs, gases such as hydrogen sulfide, which has a rotten egg-like smell, are produced, Carrier said.
While they are fairly certain about what caused the odor, administrators will continue to review the data to see if there could have been another cause, such as a possible shock overload to the system, Carrier said.
READER COMMENTS: 0
- Rymes Oil employees pull Bradford man from flaming wreck, but driver succumbs to injuries - 0
- Keene man killed in work accident in Troy Monday - 0
- Teen driver dies after being pulled from icy waters in Londonderry - 8
- Trio escapes Claremont fire after smoke wakes resident - 0
- Man suffers life-threatening injuries in Little Cohas Brook crash - 0
- Tractor-trailer pulls down poles, wires, closing part of Route 28 in Epsom - 0
- Commission honors seven for contributions to state firefighter training - 0
- Lost hikers found safe in Gilsum - 1
- Woman thrown from horse, injured - 0
READER COMMENTS: 0
- Manchester Turkey Bowl will go as scheduled - 0
- Red Sox think they got free agent signings right this time - 0
- Turkey Bowls: Passion always on the menu - 0
- Manchester Turkey Bowl: Crusaders aim to rewrite history - 0
- Dave Solomon's Power Plays: Who knew what and when in PSNH scrubber case? - 0
- Story of Marine Memorial at Hampton Beach begins with Bill Downs - 0
- Immigrants include ethnic dishes at their Thanksgiving table - 0
- Puritans in America: Daniel Webster on religion's role - 0
- Mitt Romney is out front, but says he's not running again - 0
On being American: A point for reflection
Your Turn, NH -- Mike Moffett: Republicans can win in 2016 with Kasich at the top of the ticket
Person found dead in Manchester alley