Abstract
Wastewater from breweries usually contains high levels of organic components, which are generally easily biodegradable. Ideally, the mainstream method of brewery wastewater treatment is based on biological transformation, which have been reported to be effective in efficiently reducing COD concentration. Anaerobic digestion technology plays an important role in the treatment of high strength wastewater [1]. The benefit of the process is biogas production and recovering the energy. The main goal of the paper is to present the results of a full-scale research performed in a brewery WWTP in 2016. Wastewater from brewery containing COD, a priority pollutant of organic components, is treated in IC reactor. The biogas produced during the anaerobic digestion is transformed into heat. Total COD and soluble COD were measured 5 days a week in wastewater before and after anaerobic reactor. In raw wastewater, average total COD was 5226 mg/L with the percentage share of soluble COD 89.4%. As a result of anaerobic treatment 83,7% reduction of total COD and 92.9% reduction of soluble COD were obtained. The average daily biogas production was 4089 m3/d.
Highlights
The amount of water needed to brew beer is several times the volume brewed
The average annual chemical oxygen demand (COD) was 5717 mg/L and amounted to 143% of the value assumed for the project
Results higher than the COD assumed for the project constituted 83% of the data
Summary
Large volumes of water are being used by the industry to produce beer for two distinct purposes: as the main ingredient of the beer itself and as part of the brewing process for steam raising, cooling, and washing of floors, packaging, cleaning of the brew house during and after the end of each batch operation [2]. If the brewery wastewater is discharged into the waterway, primary and secondary treatment is required. If the brewery is permitted to discharge into a municipal sewer, pretreatment may be required to meet municipal bylaws or to lessen the load on the municipal treatment plant [5]. Due to the organic compounds and high temperature, anaerobic purification is justified. Anaerobic treatment of brewery wastewater allows for removal of about 90% of the BOD. The results of an application of a full scale IC reactor in Poland will be presented, with particular attention drawn to the conversion of organic compounds into biogas
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