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.
The true environmental cost of treatment
Requirements to increase energy efficiency both in the private and public sectors have significantly influenced the approach to biosolids management during the last decade. As a direct result, biosolids management practices have evolved considerably to more complex processes that include energy recovery systems.
With this in mind, the Region of Waterloo, near Ontario, Canada, recently began updating its biosolids master plan to incorporate a life-cycle assessment (LCA) to evaluate and rank different management strategies.
Vapor-phase odor control sizing is complex. Facility designers must understand ventilation dynamics, including headspace pressurization and natural friction drag. Fan testing is a useful tool for designers working on sewers with complicated arrangements and hydraulic conditions in which pressurization points release large volumes of potentially odorous air.
The path to net zero
For the typical wastewater treatment plant (WWTP), energy costs represent a major outlay. But as technological changes simplify the processes of reducing energy demand and increasing energy generation, more WWTPs may be able to narrow the gap between how much energy they need and how much they produce.
Coming in the next issue:
Treatment requires electricity, but more and more utilities are finding ways of moving the needle away from “consume” and closer to “generate.” For example, in Charlottesville, Va., a 57-ML/d (15-mgd) plant modified its processes to improve its biogas use to generate electricity. The project also increased the reliability of the plant’s nutrient removal process.
On the other side of the country, the City of Bakersfield, Calif., succeeded in shining a light on a new solar energy project. What’s more, by taking advantage of federal and state funding sources, in the end the city will have built the solar system virtually for free.
At the heart of treatment
Say “wastewater treatment,” and the bubbling and swirling of the activated sludge process jump to mind. Managing this living process requires experience, skill, and the right tools.
Read about how 10 Arkansas communities banded together to build a plant to meet one of the strictest phosphorus limits in the U.S. — 0.1 mg/L. To achieve its goal, the resulting plant uses a three-step biological treatment process consisting of anaerobic selector basins, anoxic basins, and aerobic oxidation basins as well as chemical addition and filtration.
Also find out about a new tool to control the activated sludge process. The oxidation index, as it’s called, is a relatively simple process control parameter that can be used to decide how much treatment power to apply to achieve desired solids settleability and effluent quality.
Also in the April issue:
- How clean are your screenings? A simplified leaching method helps German wastewater treatment plant operators determine the effectiveness of their influent wash presses.
- A natural solution for industry-heavy wastewater. A Virginia WWTP tests an algae-based nitrogen removal system to help meet nutrient limits at a reasonable cost.
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