2007 Ground Water Summit

Monday, April 30, 2007 : 10:50 a.m.

Gas Feed of CO2 to Optimize pH Control in Adsorptive Arsenic Removal Applications

George C. Solymosi, A.S.E.T.1, Rich Dennis, B.S., Chem., Eng1 and Bill Fehrman, BS, Electronics2, (1)Severn Trent Services Inc., (2)Severn Trent Services

This paper will address pH control and its importance in Arsenic (As) removal applications. Achieving an optimum pH level in an adsorptive system allows granular or pelletized ferric oxide As removal media to operate more effectively.   Various automatic pH control methods such as acid feed with hydrochloric or sulfuric acid will be presented; however, this paper will focus on pH control systems utilizing CO2 vacuum regulators which reduce pressurized CO2 to a vacuum condition. A vacuum producing venturi ejector provides initial mixing of the CO2 which commences in the recovery area of the venturi. Systems requiring enhanced mixing may be aided by a properly designed static mixer. These vacuum CO2 systems will be compared with fully pressurized CO2 systems using membrane-based pressure CO2 diffuser assemblies.   Lastly, the safety of the aforementioned pH control systems, along with relative budgetary costs will be explored and presented.

George C. Solymosi, A.S.E.T., Severn Trent Services Inc. George has 30 years combined experience with Capital Controls and Severn Trent Services in the field of Disinfection Technologies. He has held positions from Quality Control Technician and Field Service Engineer, to Product Manager and Western Sales Manager, U.S. Sales. Currently, George is responsible for Business Development in North America for Gas Feed Systems & Instrumentation, where he supports the company's representatives, distributors and the corporate field sales force. George graduated from Spring Garden College in Philadelphia, PA with an Associate's Degree in Electronics Technology.

Rich Dennis, B.S., Chem., Eng, Severn Trent Services Inc. Rich has over 14 years experience with Severn Trent Services as Product Manager, Separation Technologies. In this role, Rich is responsible for the design and implementation of various filtration techniques as well as Arsenic removal systems utilizing adsorptive methodologies. Prior to joining Severn Trent Services, Rich was employed with IMC, which specialized in the phosphate industry. Rich graduated from Lehigh University in Bethlehem, PA with a Bachelor's Degree in Chemical Engineering.

Bill Fehrman, BS, Electronics, Severn Trent Services Bill has over 40 years combined experience with Allen Sherman Hoff, BCM Engineers, Fischer & Porter, Capital Controls and Severn Trent Services. He has held positions of Design Engineer, Project Engineer, Product Specialist. Currently, he is the Product Manager for Gas Feed Systems and technically supports a global network of distributors and representatives. Bill graduated from New York Institute of Technology with a BS degree in Electronics.


The 2007 Ground Water Summit