Municipal Wastewater Treatment Plants

Physical/Chemical Treatment Process:

SEDIMENTATION & CENTRIFUGATION NEWSLETTER October 2001 No. 262 Austin, Texas Had Contract with U.S. Filter-Davis for Biocides The city of Austin, TX, approved a resolution in 1997 authorizing execution of a twelve-month supply agreement with U.S. Filter/Davis, Inc., Tallevast, FL, for the purchase of approximately 115,000 gallons of Bioxide used to control sewer odor and corrosion problems in sewer lines, in an amount not to exceed $201,250 with two twelve-month extension options in an amount not to exceed $201,250 per extension, for a total contract amount not to exceed $603,750. Funding in the amount of $150,938 was included in the 1997-98 operating budget of the Water and Wastewater Utility. Funding for the remaining three months of the contact and the extension options is contingent upon available funding in future budgets. www.ci.austin.tx.us.

Aquionics Inc. has received a contract to supply 14 InLine ultraviolet (UV) systems for the R.L. Sutton Water Reclamation Facility in Cobb County, GA. Camp,Dresser & McKee has desinged the facility that is being completely rebuilt. Completion is slated for next year. The Cobb County facility will be able to handle peak flows of 120 millin gallons per day.

SEDIMENTATION & CENTRIFUGATION NEWSLETTER October 2001 No. 262 Crystal Lake, Illinois was Paying Viking Chemical $17.55 for 15-Gallon Containers of Hydrofluosilicic Acid In 1996 Crystal Lake, IL, awarded the bid for a twelve-month contract for the provision of liquid aluminum sulfate, utilized at the wastewater treatment plants for phosphorus removal, to the lowest responsible bidder, General Alum & Chemical Corp. of Holland, OH, in the amount of $165.00/dry ton. It also awarded the bid for a one-year contract for liquid chlorine used at the water treatment plants and liquid hydrofluosilicic acid used at the wastewater treatment plants, to the lowest responsible bidders. For liquid chlorine in one-ton units, Hydrite Chemical of Lake Zurich, IL, in the amount of $395.00/ton; for liquid chlorine in 150-lb units, Alexander Chemical of Lisle, IL, in the amount of $45.000/cylinder; and for liquid hydrofluosilicic acid, Viking Chemical of Rockford, IL, in the amount of $17.55/15 gals. www.crystallake.org.

UV Disinfection Contract for Jefferson County, AL and Trojan Technologies Trojan Technologies Inc. (TSE/TUV) announced that since March 1, 2001, the company has been awarded over C$20 million in contracts to supply ultraviolet (UV) disinfection systems for municipal wastewater treatment. These contracts include the largest ever received in Trojan’s history with a value of over C$15 million. This contract is also the largest UV disinfection treatment contract awarded in the UV disinfection industry. The project is for the Jefferson County Commission—Environmental Services Dept. in Alabama. Trojan will supply its UV disinfection technology to treat up to 360 million gallons per day (mgd) of municipal wastewater and sewer overflows during storm events. This expansion is a six-fold increase in the plant’s treatment capacity. The consulting engineering firm of Gary L. Owen and Associates Inc. is responsible for the overall project design and construction management. The contracting firm of B.L. Harbert Construction International LLC was awarded the construction contract to install the UV systems. For further information, see www.trojanuv.com/ir_news.htm#newcontracts

Physical-Chemical Treatment of Municipal Wastewater and Use of Sand Filtration for Treating Wet-Weather Flows This paper presents a unique design and full scale operating data for the year 2000 in treating municipal wastewater. The City of North Tonawanda, NY owns and operates this 20 MGD plant. The plant utilizes physical and chemical processes and thus offers full readiness in treating wet weather flows at all times. The plant can double the dry weather flows to treat the wet weather flows in matter of hours. Many features are notable at this facility. The enhanced primary sedimentation removes pollutant loadings much more than the conventional ones and meets the total phosphorus limit at the process. The sand filters have been proven in filtering enhanced primary effluent producing a good effluent. The activated carbon adsorber then polishes the effluent prior to chlorination. The Retention Basin consists of a sedimentation section (1.5MG), Basin 1(2 MG) and Basin 2(3 MG), a total volume of 6.5 MG, designed for 1 hour, 10 year flows. The Retention Basin performed well during 10 events in 2000, producing effluents similar to that from the primary sedimentation tanks. The sludge from this plant is well stabilized by anaerobic digestion and easy for dewatering. Costs are presented for comparison purpose in the paper. Experiences from this unique plant offer a noteworthy case for handling a wet weather flows and physical-chemical treatment processes. KEYWORDS: CSO, sand filtration, enhanced primary sedimentation, activated carbon, retention basin