The massive dumping of food waste into the drainage system contaminated the waste treatment plants filtration systems causing hug and costly down times for cleaning and replacement of the filtration systems.
Asian countries do not have the luxury of vast empty land areas to dump waste food so most waste food generated in residential or commercial food service facilities is disposed of using residential and commercial insinkerators. Unfortunately, this massive dumping of food waste into the drainage system contaminates the waste treatment plants filtration systems causing huge and costly down times for cleaning and replacement of the filtration systems.
Over the past fifteen years some Asian companies began to realize the negative impact that food waste was having on their waste treatment filtration plants and developed machines using enzymes, fresh water and wood chips to reduce the weight and volume of food waste at the site - restaurants, hotels, hospitals etc. In Korea specifically, these enzyme based machines have been largely abandoned due to the negative impact of "gray water" that contains high concentrations of BOD and TSS.
The next generation of food waste machines utilizes high heat recirculation to "dehydrate" the waste food reducing the volume and weight by up to 90%. The machines strip off the water from the food waste producing a sterile bio-mass that can be used as a soil amendment, bio-fuel or as animal feed. The water is evaporated from the heating chamber, condensed and emptied into the drain lines as sterile condensate. Today there are four or five manufacturers in Asia that market their solutions in Asia, Europe and N. America and all have differentiating features and functionalities.
For over fifty years, the only solution for larger sites such as schools and universities, military bases and camps, hospitals and convention centers who processed 1,000 to 2,000lbs of food waste and more was to purchase a pulping system that reduced the weight of the food waste by 50% by first pulping the food and then removing the water in a spin cycle sending gray water down the drain. These systems use a great amount of fresh water but not as much as the enzyme based machines.
Some clients have now elected to place dehydrators at the back end of the pulper systems to further reduce the waste. Starting with 1,000lbs of food waste and reducing the water content by 50% the remaining 500lbs could then be further reduced by an additional 80~90% using the dehydrators.