In the U.S., there are over 15,000 operational public wastewater treatment facilities. Of these, over 70% are considered ‘small systems’. EPA considers a wastewater system small if it serves a community with a population of 10,000 or fewer people and an average daily wastewater flow of less than 1M gallons per day (GPD). Because small communities tend to be economically disadvantaged, under-served, land locked, and
Industrial wastewater systems are found in the majority of manufacturing facilities that use water in their manufacturing process. This includes food and beverage, pulp and paper, chemical processing, petroleum, textile and steel industries. As a rule, industrial wastewater is relatively high strength and is subject to extreme characteristics. Industries are being driven to explore and invest in new approaches to treatment.
Lagoons are a very common wastewater treatment design worldwide. Wastewater treatment facilities utilizing lagoons entirely or as part of a larger system can be found in municipalities, industry and agriculture. Lagoons are an older method for wastewater treatment with the majority of lagoon systems currently in operation being installed 50-20 years ago. Typically, lagoons are thought of as requiring low maintenance and cost
Microbial Discovery Group To Exhibit At AWT 2016
Microbial Discovery Group (MDG) will be exhibiting at the 2016 AWT Convention and Exposition in San Diego on September 7th-10th. This event is dedicated to bringing together professionals in the industrial water treatment industry and offers opportunities for education, product and partner exploration, and business connections.
This will be MDG’s third year
Denitrification and Floating Sludge
What is Denitrification?
Denitrification is the conversion of soluble nitrate to nitrogen gas in the nitrogen cycle. For denitrification to occur, three factors are needed:
Presence of Nitrate
Anoxic conditions (no free dissolved oxygen)
A carbon source (soluble BOD)
Denitrification is useful and desired in certain anoxic zones designed to remove nitrogen. However, the
FRANKLIN, WI. - Microbial Discovery Group LLC (MDG) announced two recent additions to the company's Biotifx™ wastewater team to meet the needs of their growing workforce and market expansion. Michael Kastel was named Wastewater Salesmen and Dan Romanek was appointed Technical Service Manager.
Michael comes with experience within the field of sales, having spent past years with Cintas, RAMSCO and Dynamic Contracting Services. Michael will
Toxicity vs Inhibition
It is important to realize that in wastewater processes, there are many genres of bacteria that are responsible for wastewater treatment. The different genres respond differently to system stresses depending on their sensitivity of the organisms and their enzyme systems. For example, nitrobacter are extremely sensitive to changes in temperature, pH, and low concentrations of substances such as quaternary ammonium,
What is Bulking Sludge?
By definition, a bulking sludge is a sludge that has a sludge volume index (SVI) of >150 mL/gram. In practical applications, the SVI for each plant (where problems of solids loss over the clarifier weirs) is site specific due to hydraulics and solids loading rates. In simple terms, if the sludge doesn’t settle well in the clarifier, it may be a bulking sludge.
What Are The Causes for Sludge Bulking?
Zooglea can cause foaming and bulking (poor settling) due to their thick polysaccharide (slime) capsules if present at a high enough abundance. Common control strategies include decreasing septicity, step feed, and lowering the F/M ratio. At low abundance, zooglea are not problematic as they are floc forming bacteria. At a high abundance, zooglea can cause foaming, bulking, and poor dewatering of sludge.
Richard et al
Identifying Causes of Foam
The cause of foaming should never be assumed. If there is foam in your plant, it is recommended to perform a microscopic evaluation of the foam and mixed liquor. As a general rule, if the organism is much more concentrated in the foam than the underlying MLSS, this can be associated with the foam. Dilution of the foam is necessary for microscopic evaluation, because foams are highly concentrated. There are many