Water Environment & Technology (WE&T) is the premier magazine for the water quality field. WE&T provides information on what professionals demand: cutting-edge technologies, innovative solutions, operations and maintenance, regulatory and legislative impacts, and professional development.
How Low Is Too Low?
After taking on additional organic waste from local industries, the Fresno–Clovis Regional Wastewater Reclamation Facility found it difficult to meet requirements for effluent total suspended solids and
biochemical oxygen demand. The plant operations staff embarked on a radical — but ultimately successful — approach: Use a low dissolved-oxygen concentration in the aeration tanks.
Taming Wild Sewer Systems
Sewers are wild places. All types of naturally occurring bacteria grow there. The one thing these bacteria have in common is that, for the most part, they cause problems. Filamentous bacteria — specifically sulfate-reducing bacteria — produce hydrogen sulfide, and other odor
causing bacteria dominate the wild microbiology of the collection system.
But what if the sewers could be tamed? What if those miles of existing pipe could be turned into a meaningful treatment step?
Big City, Big Challenge
It wasn’t raining when Noah built the ark. Likewise, the New York City Department of Environmental Protection isn’t waiting for heat waves and coastal flooding before raising aeration tank walls, moving pumps to higher
ground, and otherwise preparing the city’s water and wastewater infrastructure for climate change.
Coming in the next issue:
Effectively Handling High Flows. Learn how to better estimate inflow and infiltration from rainfall using only data you’re already collecting and a spreadsheet. You’ll find out how a Wisconsin utility used innovative design methods to overcome extremely tight site restrictions to build a 2460-m³ (650,000-gal) storage tank for sanitary sewer flow to prevent sanitary sewer overflows. And, you’ll read how upgrades and a new combined sewer overflow abatement facility treated more than 1.14 million m³/d (200 mgd) of stormwater that otherwise would have flowed directly into the Connecticut River, reducing untreated discharges by 92%.
Also in this issue:
- Solving the many mysteries of mercury reduction
- Microconstituents: Whose responsibility are they?
- Building the ideal grit-removal solution