INFILCO

CASE STUDY:

MANGAZUR®

LAKE HAVASU WTPLake Havasu City, aZ26 MGD ManGazur® SySteM For the reMoval oF ManGaneSe

separations Group

CASE STUDY: INFILCO

INFILCO DEGREMONT INC.8007 Discovery Dr.richmonD, vA 23229 UsATeL (804) 756-7600 | FAX (804) 756-7643www.DeGremonT-TechnoLoGies.com

LAKE HAVASU WTPlake havaSu City, az

MANGAZUR®

QUICK FACTS:Number of uNits: 4 filters

fLoW rAte: 26MGD Peak flow

APPLiCAtioN: MaNGaNese, aMMoNia, areseNiC reMoVal

ComPLetioN DAte: July 2004

BACKGROUND

Lake Havasu City, Arizona operates on 14 different wells. Groundwater contains high levels of manganese, 0.9-1.2mg/L, which causes staining and precipitation of manganese dioxide on the interior of the distribution system pipes. A Water Source Development project was established to develop a manganese removal treatment plant for the removal of manganese to the 0.05mg/L level.

Other water quality concerns addressed in the project were impacts on arsenic and ammonia removal and disinfection byproduct formation.

SOLUTION

A full scale water treatment plant was designed using IDI’s Mangazur system. The system includes cascade aeration followed by the Mangazur process. The Mangazur process was designed using IDI’s Aquazur V gravity filters each having a surface area of 1,211 ft2 and sized for filtration rate of 3.75 gpm/ft2. The media bed has a depth of 6’-6” which allows for complete nitrification in the top layers of media. The filter is backwashed once a week using a simultaneous air and water technique.

PILOT

In 1998, five parallel pilot plant studies were conducted to investigate all known Mn removal technologies and to evaluate treatment capability and cost. Evaluated processes included greensand filtration, electromedia filtration, membrane filtration, biological filtration (IDI) and ozone combined with automatic backwash filtration units.

IDI’s Mangazur pilot provided consistent removal of ammonia levels < 0.1mg/L as NH4-N, total manganese well below 0.05mg/L and turbidity < 0.1mg/L. It had longer filter runs than any other process. Sludge produced settled better and was

easier to dewater than sludge produced from the chemical oxidation processes. After evaluation, IDI’s Mangazur was selected as the most cost effective and the most reliable.

PERFORMANCE

Influent Quality Range Effluent Quality

Ammonia: 0.1 - 1.1 <0.1 mg/L

Manganese: 0.9 - 1.2 <0.05 mg/L

Arsenic: 0.01 - 0.017 0.0041 mg/L