| Popis: |
Commercial pig farms in Cambodia produce great amounts of wastewater, and more of them understand the importance of converting that into biogas usable to produce electricity. More and more farms are operating biogas systems, mainly in the form of a simple covered lagoon. However, most biodigesters lack desulfurizing systems that are considered most important to reduce H2S present in biogas for smooth generator operation. This is because desulfurizing systems are not available inside the country, and very few farms can afford to purchase them from abroad. An imported desulfurizing system is usually highly expensive, while after-sale service is hard to find. All these factors may lead to reluctance of farm owners to fully invest in biogas systems. Therefore, this paper aimed to compare biogas quantity and quality between two desulfurizing systems, to analyze electricity generation and generator efficiency, and to perform economic assessment of the desulfurizing systems. The study was conducted on two large-scale pig farms in two different periods. The first period was with a pig farm of 20,000 fattening pigs and 6,000 sows, starting from October 2021 to July 2022. The second period targeted a pig farm of 5,000 fattening pigs and 600 sows. The first farm is located in Preah Sihanouk Province, and the second farm in Kampong Thom Province. The results show that biogas quantity was greater with the first farm because it had more pigs. However, CH4, CO2, and O2 were not different before and after desulfurization for each one of the desulfurizing systems.H2S was affected by desulfurization and reduced to lower than 100 ppm, which is good for generator operation. Due to larger generator size, the first farm produced greater output power (267 kW), when compared to the secondThe size and capacity of the BTIC desulfurizing system is similar to the Chinese product. Thus, if the first farm used the BTIC prototype, huge amounts of money could be saved every year. In conclusion, the BTIC desulfurizing system had a working performance similar to that of the Chinese product, but had a low depreciation costs, denoting huge savings. Further studies should focus on the dissemination of the BTIC prototype to a large number of pig farms through collaboration with the private sector and fabricators for strong market linkage. farm that had output power of 112 kW only. Higher generator efficiency was also observed on the first farm. |
