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Application Diagnosing odor problems in wastewater treatment plants can be intriguing and begins with a thorough investigation of the plant, its processes, and purposes. leaving the pond to come from below the odor cap. 3. Finally, the influent to the pond, which contains the BOD for anaerobic digestion, cannot be hot water. Hot water will float across the top of the pond, and the BOD in it will use up the oxygen in the odor cap. For this reason, odor capping is difficult in some industrial treatment applications, such as beef processing, where the influent is hot wash-down water. Often these plants use hot water that is high in BOD. For those ponds, aerobic digestion of all influent is one solution, or the pond can be covered to achieve odor control. atmosphere at the distribution dish (see diagram). Because water in ponds is found in thin, horizontal layers, usually one machine set at the deepest part of the pond will remove sulfides across the bottom of the entire pond. The sulfide smell is usually noticeable right at the machine, but not at shore. Then, when the pond turns over from time to time, there is no odor event because no sulfides remain on the bottom water. Conclusion Diagnosing odor problems in wastewater treatment plants can be intriguing and begins with a thorough investigation of the plant, its processes, and purposes. Deep Industrial Pond: What is the theory of the pond's design and how is Constant Degassing In An Anaerobic Pond it operating? How do the inflows and outflows work? Some industrial wastewater ponds can be quite deep, Why and when are the odor problems occurring? 30 to 50 feet, for example, and may contain mostly Just as each plant is unique, each solution is unique, mineral- and salt-based wastewater, such as boiler but many pond odor problems, and solutions, will fall blow-down water from a power plant. Mining ponds into one of the three categories mentioned above. and oilfield wastewater ponds can also have this Whatever the situation, circulators can be a viable tool problem. in both aerobic and In these ponds, the Deep Industrial Pond anaerobic pond types. sulfate comes in with They can often be the water and other installed and operated minerals, as opposed at a fraction of the cost to being released of other methods, yet during digestion of operate compatibly organic material. In the with existing aeration anaerobic environment systems. And in at the bottom of the industrial applications pond, some sulfate is in the U.S., the solarconverted to sulfide powered machine and trapped in the cold, qualifies for a 30 high-salt, high-density percent investment tax water at the bottom of credit and accelerated Deep, dense water, along with hydrogen sulfide, is continuously drawn up to the surface the pond. Then, when of the pond and depressurized. Sulfides vent into the atmosphere at the distribution dish. depreciation. Treatment the pond turns over and plant operators will goes into a full mixing discover it's worth their mode, particularly in the fall and during some spring investigative time to consider circulators — and curtail nights, a huge amount of sulfides can be released into resident complaints about odors forever. the air. As illustrated above, in these ponds, an effective Joel Bleth is president and CEO of Medora Corporation, which odor-control strategy is to place one or more circulators he cofounded with Willard Tormaschy in 1998. Bleth holds degrees in engineering and law from the University of North in the pond, depending on pond size, with the intake Dakota, Grand Forks. hose all the way to the bottom of the pond. The deep, dense water with the dissolved hydrogen sulfide is continuously drawn up to the surface of the pond and depressurized, and the sulfides vent into the wateronline.com ■ Water Online The Magazine 17