The document provides an overview of Springdale Water Utility's biosolids dryer project. It discusses the utility's existing sludge handling process which involves transporting biosolids to a nearby landfill. This landfill has limited remaining capacity and operational hours. The document evaluates various biosolids drying equipment options that would allow the utility to process biosolids on site and produce Class A biosolids. It provides cost comparisons of the options and recommends the Huber direct heat dryer based on its ability to securely process biosolids on site and its overall cost-effectiveness.

1. Springdale Water Utility
Biosolids Dryer Project Overview
September 13, 2017

2.  Evaluate existing plant solids capacity
 Evaluate sludge handling and disposal methods
 Operationally limited due to solids handling
 Landfill hours of operation
 10-12 years of capacity remaining in Waste
Management (WM) Landfill in Tontitown
 Regional and local options
Introduction and Purpose

3. Existing Process

4.  Total cost to take solids from water to landfill is $36.75
per wet ton.
 SWU handles billing and collection for WM trash service.
 Possibility that Tontitown landfill may close - will reach
capacity ~ 2025-2027.
 No other local facilities accept biosolids.
 Nearest alternative is the current SWU backup plan in
Lamar, Mo.
• 150 miles away
• Estimated remaining capacity – 25 year
Existing Process

5.  Belt Press System was installed in 2005.
 Treatment plant recovers about 1,923 wet tons of biosolids
per month.
 Monthly average of 17.1% of solids from influent sewage.
 Waste Management (WM) owns landfill and accepts waste in
accordance with contract with SWU.
• WM contract is renewed annually, renegotiated every 5
years
• SWU is contractually available for leachate treatment to
the landfill.
• WM contract expires December 31, 2020
Existing Process

6.  Treatment plant recovers about 1,923 wet tons of biosolids per
month.
 Monthly average of 17.1% of solids from influent sewage.
 Total cost to take solids from water to landfill is $36.75 per wet
ton.
Current / Projected Costs

7.  Springdale’s population grew by 133% from 1990 to 2010.
 If Springdale repeats that growth over the next 20 years, the existing plant will
need to modify operations in solids handling
 NWA regional planning projects population in 2030 to be 112,369
-
20,000
40,000
60,000
80,000
100,000
120,000
0
10
20
30
40
50
60
70
80
90
100
2010 2015 2020 2025 2030
Industry Solids
Residential Solids
Total Solids
Population
Solids & Population Projections

8.  The most secure option is to convert waste sludge to a final
product that is not EPA regulated – Class A Biosolid
 EPA recognizes three methods:
• Mulching
• Chemical pH adjustment
• Time at temperature
 Goal is pathogen reduction to undetectable levels
 Focus on time and temperature to limit chemical exposure,
material handling and widest range of product desirability.
Operational Security / Associated Costs

9.  Immediate costs required to use equipment the first day
 Operational costs – what SWU would pay annually to keep the
equipment processing biosolids
 Site selection narrowed down to three and whether they support
the operational requirements of a given piece of equipment
others were considered
• 4,000 wet tons per month
 Conservative estimate based on projected population
• 17.1% solids
• 104 hours of operation per week – Revised to 6 Days per
week
• Full redundancy
 Justified by security of operations
• Budget price
Direct Heat / Indirect Heat / Solar

10.  Batch Drying Process
 City of Fayetteville uses similar technology for initial drying
 How sensitive is the process to changes in economic climate?
 Price of natural gas has no effect on lifetime costs.
 Parkson Solar System is not severely affected by changes in energy costs.
Solar

11. Solar

12.  Continuous feed process.
 Equipment uses a boiler to heat oil, which transfers heat to biosolids.
 Heat-transfer oil is heated in a boiler and piped to a mixer .
 Heating oil is kept separate through the mixing device and returned for reheating.
 Steam is optional, but not recommended by MCE.
 Rogers and Fayetteville apply this method.
Indirect Heating

13. Komline-Sanderson

14. Therma-Flite

15. Infilco

16. Direct Heat Dryers
 Continuous feed process
 Heated air is used for drying
 Heated air is re-circulated – increasing efficiency
 Lower maximum temperature

17. Wyse Direct Heat Dryers

18. Wyse Direct Heat Dryers

21. Considered in this option, it must be stated that the biosolids will not be converted to
a Class A product and will still be subject to the decisions and regulations of the
landfill. MCE included an initial cost of $1,200,000 for piping, tanks, aerators, and
controls to store sludge for processing so that production costs would remain similar
at peak production and to ensure that the plant could meet similar nutrient limits
other processes would allow.
$1,000,000.00
$6,000,000.00
$11,000,000.00
$16,000,000.00
$21,000,000.00
$26,000,000.00
$31,000,000.00
$36,000,000.00
2015 2020 2025 2030
Project Life Costs Continuing to Landfill
Expected Cost
Best Case Scenario
Worst Case Scenario
Continued Landfill Use

22. Continued Landfill Use Lamar
$-
$5,000,000.00
$10,000,000.00
$15,000,000.00
$20,000,000.00
$25,000,000.00
$30,000,000.00
$35,000,000.00
$40,000,000.00
$45,000,000.00
$50,000,000.00
2015 2020 2025 2030
Lamar beginning in 2025
Expected Tontitown Cost
Lamar beginning in 2020
Lamar beginning in 2015

23. Selection Summary - SWU Only
SWU WWTF
Komline-Sanderson $37,381,747
Therma-Flite $30,032,510
Infilco $39,474,988
Parkson $34,563,975
Wyse $24,395,029
Huber $35,000,100

24. Overall Site Layout

25. Building Layout

27.  Present Preliminary Budget Pricing 4/19/2017
 Issue Purchase Order for Huber Dryer 8/17/2017
 (8 to 12 Weeks for Submittals)
 Submit to ADEQ 11/15/2017
 Present Guaranteed Maximum Price 1/5/2018
 Begin Construction 4/1/2018
 20 Months
 Complete Construction 12/31/2019
 Waste Management Contract Expiration 12/31/2020
Schedule

28. Conclusion
 Lowest cost is to continue hauling sludge to the Ecovista (Waste
Management) landfill.
• Limited Life
• Limited operational hours
• Continuous contract negotiations
 Security of operations – maintain drying process at SWU facility-
most cost-effective biosolid drying operations.