1. Max Gangestad Martin Gross PhD Zhiyou Wen PhD
New Algae Treatment Technology Addresses Stricter Wastewater Regulations for Rural Iowa
Max Gangestad
Martin Gross PhD
Zhiyou Wen PhD

2. Problem
Iowa Towns With Lagoon Treatment
Iowa Cities with Lagoon System
584
Iowa Citizens using Lagoon System
605,110
New wastewater regulations in Iowa require reduction of nutrients
Substantial economical cost to rural Iowa towns
Biggest impact on lagoon system communities

3. Solution Revolving Algal Biofilm (RAB)
Technology invented at ISU using algae to efficiently remove nutrients
Potential to greatly reduce cost for small towns

4. Nutrient Removal Process

5. Average Cost for New System Total Cost for All Lagoons in Iowa
Impact
Mechanized Plant
RAB
System
Amount Saved
Average Cost for New System
$5M
$1.5M
$3.5M
Total Cost for All Lagoons in Iowa
$2.9B
$876M
$2B
Cost per Citizen
$4,825
$1,447
$3,378

6. Pilot-Scale Research
Pilot-scale research of RAB system in Dallas Center, IA
Results are critical in identifying optimal operational parameters prior to full-scale
Hydraulic retention time
Nutrient removal in varying climate
DNR approval

7. Results: Ammonia Removal
Ammonia Removal Percentage
24 Hour
92%
4 Hour
72%
0.8 Hour
55%

8. Fertilizer Research
Using algae as fertilizer compared to purchased fertilizers
Amount of nitrogen applied was standardized between all samples
Identical growing conditions

9. Fertilizer Test Results

10. Summary
New regulations put an economic strain on rural Iowa towns. RAB technology has the potential to greatly reduce that strain on small towns and offer a fertilizer byproduct. However, pilot-scale research is required in order to gain regulatory approval and determine optimal operating conditions.

11. Acknowledgements Partners: City of Dallas Center
Funding:
Partners:
City of Dallas Center
Horticulture Department
Biocentury Research Farm

12. QUESTIONS? Max Gangestad