Development of a Mixture of Dan Kwian Clay Body and Dong Ma Fai Coffee Grounds to Create a Ceramic Filter for Dong Ma Fai Coffee Drip
Keywords:Ceramic Filter, Dan Kwian clay body, Dong Ma Fai coffee grounds, coffee drip, Porosity
This research aims to study the influence of added Dongmafai coffee grounds on the flow rate of hot water through the ceramic filter. In the experiment, coffee grounds were added in amounts of 20, 30, and 40% by weight (the samples were DKS-3, DKS-4, and DKS-5, respectively) and mixed with Dan Kwian clay, Lampang kaolin clay, sand, and Dan Kwian wood ash. The ceramic filter was formed by the jigger technique and sintered at 1,250°C. The results revealed the following physical characteristics: apparent porosity in the range of 48.45–55.54%, water absorption in the range of 36.30–48.48%, density in the range of 1.15–1.33 g/cm3, and specific gravity in the range of 2.51–2.59. The DKS-4 sample has physical properties that are suitable for filtering. Then, physical properties were examined by the XRD technique. It was found that cristobalite silica and orthorhombic mullite phases were formed in the ceramic filter (DKS-4). The porosity characteristics of the ceramic filters were analyzed by SEM. It was found that many small pores were formed in the structure from the combustion and disappearance of the coffee grounds. And affecting the flow rate of hot water through the filter because the addition of coffee grounds will increase the flow rate of hot water through the filter, which has a maximum value of 2.30 ml/s. Which uses filters to make drip coffee instead of paper filters, helping to reduce global warming.
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