NVP Energy’s unique technology is ideally suited to treating the high concentrations of organic pollutants in dairy wastewater through the production of biogas available for reuse on-site and can achieve up to 80% removal of organic constituents. The technology treats wastewater at ambient temperatures and can even treat wastewater as low as 4°C meaning there is no heat input required. NVP Energy’s innovative technology greatly reduces the biochemical oxygen demand (BOD), chemical oxygen demand (COD) and total suspended solids (TSS) concentrations in the effluent.
Dairy wastewater is notable for being variable in composition. It contains water from a number of sources including wash-water used in operations such as equipment washing; line purging at product changeover; start-up, shutdown and changeover of high temperature short time (HTST) pasteurisation units and product washing. The wastewater typically has a high BOD especially that from the cream, butter, cheese and whey processes. High COD levels and the high concentrations of suspended solids may also be an issue in wastewater from this industry as well as the presence of other pollutants such as phosphorus, nitrogen and chloride.
NVP Energy’s package is tailored to meet each individual’s case taking all factors of their wastewater streams into account. NVP Energy’s reference site at Arrabawn Dairies required a number of pre- and post-treatment steps including flocculation, flotation, anoxic tank and pH control.