Kinetic Study on the Effect of Substrate and Micronutrient Inhibition during Anaerobic Fermentation of Biohydrogen

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There are several factors that influence the production of biohydrogen by dark fermentation including inoculum seeds, type and concentration of substrate, pH, temperature, presence of micronutrient and reactor configuration. Previous research has proven that the concentration of substrate and the presence of micronutrient will influence the yield and productivity of biohydrogen production. However, improvement of yield and productivity of the process can only be achieved once the system is under the optimum amount of substrate and micronutrient. Therefore, the best way to determine the effect of substrate concentration and presence of micronutrient is through kinetic study that was done using Monod model along with Andrews model. Besides that, the substrate inhibition effect also will be evaluated to determine the maximum substrate that needs to be supplied for maximum hydrogen production, and thus supplied the information for economic feasibility for fermentation process. In the meantime, the inhibition effect of adding the iron nanoparticles also had been evaluated in order to understand the interaction effect between iron nanoparticles and bacteria in term of catabolism reaction. It was found that increasing the substrate concentration more than 10 g/l will cause the inhibition to the system, in which it will slow down the reaction process and reduced the production of hydrogen. While the presence of iron NPs more than its optimum value (200 mg/l) will inhibit the bacterial growth and hence, affect the hydrogen production. For both cases, when the inhibition occurred at the respective concentration, it was found that the metabolic pathway was shifted to produce more hydrogen-consuming metabolite such as propionate acid, and thus, dropped the hydrogen production.

Survival Strategy Restaurant Business during the Covid-19 Pandemic

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The occurrence of the Covid-19 pandemic forced the entire community to adjust itself by implementing a new order of life known as the “new normal” in every activity. Likewise, restaurant businesses are not immune from the impact of the Covid- 19 pandemics, so adjustments must be made so that restaurants can continue to operate and customer health and safety-related to Covid-19 can be carried out properly and correctly. To increase the sales volume of its products, it can do several things, including Lower Menu Prices, Give Special Discounts, Create More Durable Food Packaging, Prepare Food Delivery, Restaurant Business Starts Switching to Use Technology, Communication Between Businesses & Customers, Perform Marketing Plans and Pay Attention to Current Culinary Trends. Meanwhile, to make the restaurant operational cost-efficient, several strategies can be carried out, including Designing Cost Control Measure (CCM), re-identifying budgeting short-term and long-term, prioritizing cash flow safe and stable, reorganizing or redesigning the largest expenditure, and planning a more efficient division of labor fair and impartial. Furthermore, to guarantee customer safety from being exposed to Covid-19, restaurants can do the following: Communicate Safety and sanitation measures clearly and consistently, Avoid self-served dishes, Advice to maintain distance, Make strict rules regarding the use of masks on staff and diners, Offers waiting list and online pre-order facilities, Continues to offer no-contact options, Competes aggressively with retail options, Offers packaged dining options in the long term, Performs clear and systematic cleaning.

Gastronomy of Pesan Tlengis as a Tourism Attraction in Werdi Bhuwana Village Bali

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The general purpose of this research is to improve and develop Indonesia’s tourism development, especially rural tourism attraction in Bali, through developing traditional Balinese food so that it is known globally Abroad. However, the development of traditional food has not been achieved as expected. This happens because local food has not been explored in rural areas which are very abundant with culinary potential from nature to the fullest. One example is the food product pesan tlengis which is processed into delicious dishes and comes from the dregs of the process of making virgin coconut oil in Werdi Bhuwana Village. This study discusses in depth the forms of gastronomy that can be developed into a tourist attraction, and the efforts that can be made from the gastronomic meaning of traditional food pesan tlengis in Werdi Bhuwana Village, Mengwi District, Badung Regency. The research method with a descriptive qualitative approach uses several purposefully selected informants and data collection techniques are carried out by observation, in-depth interviews, and documentation studies with the theory developed in the form of gastronomic theory along with several microforms, tourism theory, and cultural theory. The results of the research will later show that coconut-based gastronomic forms need to be developed so that they can be used as tourist attractions. Efforts that can be made to develop the gastronomy of traditional food with pesan tlengis are related to the preparation and selection of materials, processing of materials, and presentation of food to be able to create new variants and products of good quality so that tourists can enjoy them. Furthermore, the gastronomic meaning of the pesan tlengis dish has been developed to provide added value to tourists and the people of Werdi Bhuwana Village, Mengwi District, Badung Regency.