Improving Milk Value Chains: A Case Study for Qualitative-Economic Feasibility of Decentralized Solar Milk Pasteurization and Chilling Processes

Abstrakt

Milk adulteration is common and inevitable which pledges milk quality after processing and lasts in whole supply chain, particularly in least developed countries (LDCs) like Pakistan. The dairy farmers must sell raw milk due to inadequate farm-gate milk processing facilities leading to economic and quality compromises for producers and consumers, respectively. The present study pursues the milk quality and techno-economic analysis of the processed milk (pasteurized and chilled) with indigenously developed Solar Milk Chiller (SMC) and Solar Milk Pasteurizer (SMP) compared to the existing milk value chain.. The processed milk contains fat (5.4%), solid-not-fat (9.1%), salts (0.7%), protein (3.9%), lactose (4.2%), total solids (14.5%), pH (6.85), density (1.031 kg/L), and freezing point (-0.532°C). The results of sensory evaluation using a 9-point hedonic scale showed overall likeness towards solar processed milk in terms of taste, color, aroma, and freshness. The processed milk costs USD 0.003 per liter with extended shelf life and superior in quality compared to locally available open (non-packaged) and packaged milk. With an estimated operational lifespan of 10 years, the payback periods for SMC and SMP have been found to be 1.3 to 4.5 and 1.1 to 2.7 years, respectively, depending upon the alternate source for equivalent energy generation.