The fishmeal production industry is essential for providing protein for animal feed in the aquaculture sector. However, the industry faces challenges related to energy consumption and environmental sustainability. This study evaluates the energy efficiency and environmental benefits of waste heat recovery (WHR) technologies in a fishmeal production plant in Vietnam. Data were collected from the plant between 2016 and 2022, and a specific energy consumption (SEC) indicator and a comprehensive methodology were utilized. Implementing an economizer as a WHR technology resulted in a 55.5% decrease in SEC compared to the state before installation. The enhanced energy efficiency also translated to reduced energy consumption per output unit. Moreover, the economizer contributed to annual energy savings of 4537.57 GJ/year and cost savings of USD 26,474.49. Additionally, carbon dioxide (CO₂) emissions associated with producing one ton of fishmeal decreased by 58.37%. These findings highlight the potential for WHR technologies to improve energy efficiency and reduce the environmental footprint of fishmeal production. The study’s results provide valuable insights for practitioners and policymakers in promoting energy efficiency practices and reducing environmental impact in this and similar industries.

This study presents an in-depth investigation of hydrogen peroxide (H₂O₂)-assisted photocatalytic degradation of diclofenac (DCF) using N-doped TiO₂ (N-TiO₂) in a submerged membrane photocatalytic reactor (SMPR) under visible light. The technical achievements of this work include optimizing critical parameters such as solution pH, catalyst concentration, DCF concentration, and H₂O₂ concentration to maximize degradation efficiency. The results indicate that the optimal conditions for DCF removal were achieved at pH 6.5, [N-TiO₂] of 1.0 g l⁻¹, DCF concentration of 20 mg l⁻¹, and H₂O₂ concentration of 21.75 mg l⁻¹. Under these conditions, DCF removal efficiency significantly improved from 42.21% in the absence of H₂O₂ to 79.55% with the addition of H₂O₂. This demonstrates the crucial role of H₂O₂ in enhancing photocatalytic degradation performance. Comparative analysis with other studies using UV light further emphasizes the efficacy of this visible light-driven process, which achieved competitive removal rates, demonstrating the potential of visible light and N-TiO₂ as a sustainable solution for DCF degradation in wastewater. This research provides valuable insights into optimizing conditions for DCF degradation using N-TiO₂ under visible light, offering potential applications for this photocatalytic process.

The fishmeal production industry is essential for providing protein for animal feed in the aquaculture sector. However, the industry faces challenges related to energy consumption and environmental sustainability. This study evaluates the energy efficiency and environmental benefits of waste heat recovery (WHR) technologies in a fishmeal production plant in Vietnam. Data were collected from the plant between 2016 and 2022, and a specific energy consumption (SEC) indicator and a comprehensive methodology were utilized. Implementing an economizer as a WHR technology resulted in a 55.5% decrease in SEC compared to the state before installation. The enhanced energy efficiency also translated to reduced energy consumption per output unit. Moreover, the economizer contributed to annual energy savings of 4,537.57 GJ/year and cost savings of $26,474.49. Additionally, carbon dioxide (CO2) emissions associated with producing one ton of fishmeal decreased by 58.37%. These findings highlight the potential for WHR technologies to improve energy efficiency and reduce the environmental footprint of fishmeal production. The study's results provide valuable insights for practitioners and policymakers in promoting energy efficiency practices and reducing environmental impact in the industry.

The Tam Dao National Park protects one of the best-preserved natural forest remnants of Northern Vietnam, which belongs to the diversity centres of the subfamilies Phaedusinae and Garnieriinae (Clausiliidae). Based on published records and our new data, we provide an overview the clausiliids of this important protected area and discuss their zoogeographical significance. The recent survey led to the rediscovery of Synprosphyma gastrum, an endemic species that has not been found since the end of the 19th Century. Three other species of the national park, Notoptychia polydona, Oospira semipolita and Phaedusa dichroa, are rare, sporadically occurring clausiliids that are confined to remnants of natural forests in Northern Vietnam.