Water/Waste Processing - Feb 2012
discharge standards By doing so wastewater treatment installations have only generated additional costs and have never been seen as revenue generators According to Bambridge Instead of looking at efficiency and getting the inputs and outputs optimized the dairy industry has traditionally employed big systems to cover process www waterwaste com Water Waste Processing February 2012 21 mistakes with big lagoons and the like requiring huge amounts of energy to aerate However applying anaerobic wastewater treatment sheds a whole different light on the cost structure of wastewater treatment infrastructure It can now actually become a substantial additional source of income for many processing plants Dairy wastewater is well suited for anaerobic treatment followed by an aerobic polishing treatment if required e g for direct river discharge GWE has several anaerobic systems some of which can be applied on dairy wastewater There is no such thing as a standard dairy factory and a standard dairy wastewater treatment There are different types of dairy factories with different products milk packaging milk powder cream butter yogurt ice cream cottage cheese soft cheese hard cheese fruit based products custard etc all with very different wastewaters and also different levels of product recovery e g whey and or whey proteins In the end the type of production determines the wastewater characteristics The COD of dairy wastewater can be anywhere between 2000 and 10000 mg l and for cheese factories it can be much more The amount and type of fat oil and grease FOG is also very important In case of ice cream and butter there is a lot of FOG in the wastewater but it can be easily removed by DAF Dissolved Air Flotation so that a high rate ANUBIX B system sensitive to excess FOG in the wastewater is possible and often preferred In other cases with a lot of milk processing including milk powder the FOG in the wastewater is basically dilute milk and the FOG fat is very much emulsified so that a DAF cannot always remove it properly even after chemical Write In 112
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