Technical Bulletins & News


Sustainable Decentralized Treatment

Water & Wastes Digest, July 2011 - For many rural communities, the high operational and maintenance costs associated with conventional wastewater collection and treatment is prohibitive, requiring them to seek smaller-scale solutions to collect, treat and dispose of domestic wastewater safely. Communal (cluster) decentralized wastewater systems bridge the gap between traditional onsite and municipal options, allowing communities to cost effectively, address domestic wastewater issues. >>More

Press Release 13.1

Brentwood, TN, February 19, 2013 - HydroLogex™ is designing and building decentralized treatment systems utilizing the EnviroCAAT™ sequencing batch reactor (SBR). Utilizing state-of-the-art control systems and reliable process components housed in a durable fiberglass tanks, HydroLogex is now able to deliver better, more cost effective treatment solutions for flows of less than 150,000 gpd.

The EnviroCAAT SBR is a fill-and-draw, non-steady state activated sludge process. Unlike conventional processes that utilize multiple containment structures in the sequencing process, the EnviroCAAT accomplishes in a single reactor basin, the equalization, aeration and clarification in a timed sequence.  >>More

Press Release 12.1

Franklin, TN, May 25, 2012 - HydroLogex utilizes Cost-Effective Tertiary MBBR Upgrade To Existing WWTPs In Order To Meet New (Renewal) NPDES Ammonia TMDLs. Many of these of these are older and relatively smaller systems ranging from simple lagoons to complex activated sludge package plants. When permit renewal is sought, the wastewater discharger must comply with existing TMDL requirements, as well as any new applicable criteria that may have been established. >>More

Bulletin 11.3

Franklin, TN, December 3, 2011 - Nationally, there are over 16,000 existing wastewater treatment plants discharging under NPDES permits. While nutrients (TN & P) are getting a tremendous amount of attention due to their effect on watersheds, the bulk of nutrients are non-point sources such as agricultural run-off. However, the bulk of ammonia discharge can be directly linked to point source discharge from WWTPs. >>More

Press Release 11.2

Franklin, TN, May 3, 2011 - HydroLogex LLC announces the commercialization of the EnviroCAAT treatment technology for optimizing system capital costs, treating higher strenght influents and provideing greater nutrient removal options to meet stringent discharge limits. >>More

Bulletin11.1: Tighter Ammonia Criteria On The Way for NPDES Renewals

NPDES permits are subject to review/renewal on five-year cycles. When renewal is sought, the wastewater discharger must comply with both the TMDL requirements and any new applicable criteria that may have been established. The EPA has urged all states to adopt numeric nutrient standards (for Total Nitrogen and Total Phosphorous) and these standards are likely to be adopted by individual states. >>More

Bulletin10.3:  Reducing Risk when Designing Decentralized WWTS

The key to a successful decentralized wastewater project is to clearly define the hydraulic and organic loading rates and to design a system that can successfully treat the established loading rate 100% of the time. If the initial design decisions underestimate the loading rates, the system may not achieve the designed performance and the consulting engineers may find themselves explaining to the owner why the new system they certified does not meet permit limits. >>More

Bulletin10.2: "Right-Sizing" a 50,000 gpd Decentralized Wastewater System

In order to properly design a decentralized wastewater system the engineer must accurately determine the true treatment capabilities of each supplier's equipment at the actual expected organic and hydraulic loads in order to deliver a treatment solution that meets the client's expectations. >>More

Decentralized Wastewater Treatment Systems are "Shovel Ready" for USDA Rural Development's Loan and Grant Programs.

Montgomery, Alabama, March 16, 2010 - Last month at the Alabama Rural Water Association's Annual Technical Training Conference, representatives from the US Department of Agriculture advised an audience of utility operators that federal funds are readily available for water and wastewater projects in their communities. >>More

EnviroFilter Onsite Wastewater Technology Licensed by HydroLogex

Franklin, Tennessee, November 24, 2009 - Earlier this month, HydroLogex LLC completed the formation of a new company to commercially design and manufacture onsite wastewater treatment systems based on the patented EnviroFilter� technology invented by Kevin Chaffee, P.E., of Batesville, Indiana. >> More