Plant of the Year Features Microfiltration Membrane Design
The Freese and Nichols team provided a pilot study, preliminary design, final design and construction phase services for improvements to the Brown County Water Treatment Plant, a 7.5-MGD microfiltration membrane plant, which operates in conjunction with a conventional 7.5-MGD plant. (That plant was also designed by Freese and Nichols, in 1985.) The project, which also included upgrades to the conventional plant and modifications of the raw water delivery system, was funded with a low-interest subsidized loan from the Texas Water Development Board's Drinking Water State Revolving Fund.
- The plant's only pre-treatment is pre-coagulation with aluminum chlorohydrate (ACH) at a dosage rate of 5 mg/l.
- It has a high flux rate of 75 gallons per square foot per day, the highest in Texas for only pre-coagulation. The average flux rate before ACH addition was 43 gallons per square foot per day.
- To improve water production with changing raw water quality, a new membrane performance indexing method was conducted by the University of New Hampshire to assess the effects of ACH addition and to optimize the ACH dosage.
- The high flux rate and use of only pre-coagulation result in more than $3.5 million in cost savings compared to a conventional water treatment plant.
- The plant uses a thermal imaging camera to monitor microfiltration module inefficiencies.
Brown County Water Improvement District No. 1
Water Districts/River Authorities, Municipal
Construction Services, Funding, Structural, Water/Wastewater Treatment and Reuse