Parkson – Drying System
Parkson is a supplier of equipment and solutions for potable water, process water, and industrial and municipal wastewater applications. Parkson designs, engineers and assembles the products it sells into the municipal wastewater and industrial wastewater segments. The company was founded in 1960 and has been owned by Axel Johnson Inc. since 1967.
Parkson’s THERMO-SYSTEM® uses the sun as its main power source to generate 95% of the energy required for drying sludge. The result is significantly reduced operating costs compared to competing technologies like conventional gas or oil fired dryers.
The system’s sustainable drying process is fully automated and is designed with ultimate reliability in mind. A PLC carries a complex drying program that controls and monitors the entire drying process from start to finish, resulting in minimal operator attention or control. The system is engineered to incorporate very few moving parts to maximize reliability and minimize maintenance costs.
Technology Strengths, Weaknesses and Critical Indicators
Active Drying Technologies:
- Produce a marketable product, dry manure solids, and reduce transportation costs
- Require energy to reduce water content and dry manure solids, purchased energy cost are an issue
- Require operator attention in excess of other systems due to the risk of combustion
- Other compounds are released with the water (i.e. ammonia, hydrogen sulfide), and require additional treatment
- Potential loss of ammonia nitrogen due to volatilization
- Proven technology for storage reduction, odor control, GHG reduction and pathogen reduction
Evaporation and Drying Technologies:
- Uses heat to produce either manure with less water or dried manure solids
- Systems that reduce water in manure use a series of evaporators to sequentially evaporate water from liquid slurries—energy is supplied either by purchased fuel and/or waste heat from other processes
- Systems that dry separated solids use either a belt or drum to evaporate water from separated solids—energy is supplied either by purchased fuel, electricity and/or waste heat from other processes
- Chemicals are released with the water (i.e. ammonia, hydrogen sulfide), and this often requires additional treatment such as condensation of the water and/or scrubbing of the chemicals
- The requirement for purchased energy and costs are a significant concern leading to a tradeoff between input costs and gains in liquid concentration and transportation/market of by-products
1. OPERATIONAL HISTORY