Phosphorus (P) removal in wastewater is an important aspect of operating municipal and industrial waste treatment plants. Regulatory agencies often require removal of 90% of the incoming phosphorus to a treatment plant and may also require a P concentration less than 1 mg/L (ppm) in plant effluent, particularly when treated wastewater is discharged to a small stream, lake or wetlands.
Damage Caused by Excess Phosphorus
High levels of phosphorus and other nutrients, such as nitrogen, can create harmful water quality conditions. The result from excessive phosphorous levels may include:
- Algae blooms
- Excessive weed growth
- Oxygen depletion in streams, lakes, rivers and other bodies of water
Sources of Phosphorus Pollution
Nutrient loading began to garner attention in the late 1960s and early 1970s. Phosphorus pollution comes from:
- Fertilizing farm lands
- Livestock waste
- Household detergents
- Residential septic tanks
- Municipal wastewater treatment plant runoff
- Residential lawn fertilizers
- Storm water runoff
- Outdated sewage and septic systems
Phosphorus Pollution Prevention
Over the years, the two most effective control methods to reduce phosphorus have been implemented:
- Legislation to ban phosphate in laundry detergents
- Upgrading of municipal wastewater treatment plants
USALCO® Phosphorus Control Solution
USALCO has several product offerings that are highly effective for phosphorus control in wastewater treatment plants where discharge limits are set by federal, state, or local regulations. They are:
- Sodium Aluminate (LSA 38)
- Aluminum Sulfate
- DelPAC® (polyaluminum chloride)
- DelPAC XG (aluminum chlorohydrate)
- Aluminum Chloride
Depending on the application, our aluminum chemistries will outperform ferric salts and ferrous salts at a lower overall cost. USALCO recognizes that each situation is unique and our representatives can assist you in selecting the best product for your application.
One such product, sodium aluminate, LSA 38, contains the highest concentration of metal ions to sequester and control the problem. Unlike chemistries that are more acidic, Sodium Aluminate will not deplete available alkalinity and depress effluent pH below discharge limits.
LSA 38 has been proven to solve problems, add value, and provide cost savings when converting from iron-based salts.
USALCO’s Sodium Aluminate provides these benefits:
- Significant reduction in gallons per day chemical requirement
- Reduced or eliminated use of chemicals for pH adjustment, such as sodium hydroxide and lime
- Elimination of negative interference in UV systems where iron was previously utilized, thereby improving energy efficiency
- Improvement of ammonia removal and compliance in systems with deficient or depleted alkalinity.
- Consistent control year round, unlike competitive chemicals whose performance diminishes outside certain pH and or alkalinity ranges
Download the USALCO Guide to this Application
➔ Case Study #1 – Sodium Aluminate resolves seasonal performance issue
➔ Case Study #2 – Restoring compliance and reducing cost
➔ Case Study #3 – Replacing ferrous chloride eliminates metals contamination and associated cost