Recently, we developed two new Fenton catalysts using iron (Fe) and spent tea leaves or coffee grounds as raw material. In this study, Fe-to-tea or Fe-to-coffee polyphenol complexes were successfully tested as heterogeneous photo-Fenton catalysts. The photodegradation efficiency of methylene blue solutions with Fe-to-polyphenol complexes was higher than that of homogeneous iron salts in the photo-Fenton process. Furthermore, the tested Fe-to-polyphenol complexes could be reused by simply adding H2O2 to the solutions. After three sequential additions of H2O2, the conventional catalysts FeCl2·4H2O and FeCl3 removed only 16.6% and 53.6% of the dye, while the catalysts made using spent coffee grounds and tea leaves removed 94.4% and 96.0% of the dye, respectively. These results showed that the complexes formed between Fe and chlorogenic acid, caffeic acid, gallic acid and catechin, which are the main polyphenols in tea and coffee, can be used to improve the photo-Fenton process.
- IWA Publishing
- Heterogeneous photodegradation of methylene blue with iron and ...
How Coffee Rust Affects The Coffee Industry Worldwide
The coffee rust epidemic has reached a lot of countries all over the world and has been a major problem and threat to coffee plantations all over the world. The rust organism mainly attacks the leaves (though in some rare instances the rust was found on fruits and young stems.). The coffee rust is usually manifested by chlorotic young lessions or pale yellow spots before the sporulation is evident. The sports vary in shapes and sizes. This epidemic was first recorded in 1861. A British explorer discovered the...
This man turned an opium field into a sustainable coffee farm in Thailand
Somsak Sriphumthong is on a caffeine-fueled mission. After years living and working abroad, the organic farmer and community leader returned to his native Thailand several years ago — during a time when the forests were being cleared for opium fields and rice plantations. Seeking a sustainable alternative, he started growing and selling organic coffee beans on reclaimed land. Why coffee? Sriphumthong says he “didn’t want to take advantage of society … or harm people” while earning...
Coffee manufacturing plant - Case Study
Secure treatment for high oil content sludge Problem An instant coffee manufacturer in Thailand had dewatered sludge with a filter press.10 to 20 percent of the coffee beans is oil, which has caused clogging of the filter and trouble to stop the equipment for maintenance. AMCON`s offer for a solution The self-cleaning mechanism enabled Volute to stably dewater the oily sludge, which easily causes clogging and is difficult to be dewatered.The customer is satisfied with the continuous dewatering without using...
Supercritical carbon dioxide – from coffee to dry cleaning
Sometimes I can’t start the day without my morning coffee, and I’m sure most adults would agree that consuming caffeine is a part of their daily routine. A regular cup of coffee can contain 95 to 200mg of caffeine depending on what bean is used and how it has been prepared. In moderation, caffeine can elevate your mood, reduce tiredness and make you more alert, however it can also affect you negatively as consuming too much can lead to headaches, restlessness and anxiety; so it is understandable...
Irrigation water requirements for seed corn and coffee under potential climate change scenarios
The impact of potential future climate change scenarios on the irrigation water requirements (IRRs) of two major agricultural crops (coffee and seed corn) in Hawai'i was studied using the Irrigation Management System (IManSys) model. In addition to IRRs calculations, IManSys calculates runoff, deep percolation, canopy interception, and effective rainfall based on plant growth parameters, site specific soil hydrological properties, irrigation system efficiency, and long-term daily weather data. Irrigation water...