Raw water biofiltration for surface water manganese control

Area of Science:

• Environmental Science
• Water Treatment Engineering
• Microbiology

Background:

• Manganese control in drinking water is critical for public health and faces sustainability challenges.
• Conventional methods often use harsh oxidants, leading to environmental and health concerns.
• Existing treatments struggle with high manganese concentrations and complex water matrices.

Purpose of the Study:

• To evaluate a simple biofilter for manganese removal from surface water without pre-treatment.
• To assess the biofilter's efficacy under varying conditions, including high iron and ammonia levels.
• To compare the biofilter's performance against conventional treatment processes.

Main Methods:

• Utilized a biofilter design with aerated influent for lake water treatment.
• Monitored manganese concentrations in influent and effluent.
• Investigated the impact of iron and ammonia on manganese removal efficiency.

Main Results:

• Biofilters consistently reduced manganese to below 10 µg/L from influent levels exceeding 120 µg/L.
• Manganese removal was unaffected by high iron or poor ammonia removal.
• The biofilter outperformed conventional treatment in removing higher manganese concentrations.

Conclusions:

• A simple biofilter offers an effective and sustainable biological approach for manganese removal from surface water.
• This method presents a viable alternative to conventional treatments, aligning with sustainable development goals.
• The findings suggest unique manganese removal mechanisms in surface water biofilters.