BKT's technologies are developed in-house and provide various digestate solutions, from treatment to resource recovery.
Organic waste, including livestock waste, causes two major environmental problems: water contamination and air pollution. We need to treat wastewater and reduce greenhouse gas emissions, specifically methane, to prevent harmful environmental and public health impacts.
BKT has devoted years to developing proprietary solutions for digestate treatment or resource recovery and reuse. The following process flow diagram illustrates physical and biological treatment for solid and liquid separation of organic waste streams.
- High Value Fertilizer Production
- Low Cost Nutrient Removal
- Ammonia & Methane Emission Reduction
High Value Fertilizer Production
Anaerobic digestion of manure, food processing byproducts, and other waste streams provides a source of low-cost, renewable energy but also generates a high-strength waste stream that contains high concentrations of nutrients, biomass, and organic matter. Processing this waste stream is so costly that it has prevented wider adoption of anaerobic digestion. However, BKT's solution allows the digestate to become a revenue stream by enabling the recovery of nutrients in the digestate as a marketable organic fertilizer. It also concentrates the solids in the digestate, reducing hauling costs for disposal.
Low Cost Nutrient Removal
Indiana’s new law has enacted stringent nitrogen regulations for dairy farms across the state. To mitigate the harmful effects of nitrogen in the environment, Indiana farmers are now required to remove signifigant amounts of nitrogen from maunre or from the effluent in their digesters. Otherwise farmers need to purchase 10 times more land for their cows (the new law requires 10 acres of land per one head of cow).
BKT is developing an innovative nitrogen removal process for an existing anaerobic digester which will utilize less energy and will not require an external carbon source.
BKT’s DAF system has a 30% higher efficiency in removing suspended volatile solids compared to other conventional DAF systems.
BKT’s AMX process requires 60% less aeration and no external carbon source for the nitrogen removal process. As a result, our AMX process can reduce overall operating costs by 90% compared to conventional BNR (Biological Nutrient Removal) systems, making it a very economical and efficient solution.
Ammonia & Methane Gas Reduction
California governor Jerry Brown signed legislation in September 2016 which regulated heattrapping gases at livestock operations and landfills. The new law aims to reduce methane emissions on dairy farms and livestock treatment operations to less than 40 percent by 2030.
(Source: California targets cow gas, belching and manure as part of global warming fight - Los Angeles Times, Nov. 29, 2016)
- Tomorrow Water proposes a high efficient micro bubble DAF(VAF) system with a patent pending SBR system to remove more than 90% of volatile solids (VS), whereas anaerobic digestion can reduce only 50% of volatile solids.
- Tomorrow Water’s DAF(VAF) system has 30% higher efficiency in removing suspended volatile solid than other conventional DAF system
- Tomorrow Water’s SBR system can remove dissolved volatile solid in the effluent of DAF system efficiently.
- Combined, Tomorrow Water’s process can remove over 90% of volatile solids, achieving the methane gas reduction goal successfully.
- Nutrient recovery using BKT’s DAF (VAF) system is a bonus.