Researchers reuse beer brewing waste as fish feed. They also take advantage of other waste:

A bartender pulling a beer in a bar.

Spanish entrepreneurs have shown that discarded beer ingredients can feed fish, vegetable waste can be used to make furniture and that used oil can be converted into detergent: these are examples of which any residue it has a new useful life as a resource.

The projects that try to give a new opportunity to the waste of our society are increasingly original, as the project shows Life Brewery, whose objective is “to reuse by-products that are generated during the manufacture of beer as new sources of raw material in feed to feed the fish“.

This was explained in an interview with the Efe agency Mikel Orive, an expert in efficient and sustainable processes at the Basque technology center AZTI, where researchers have developed various types of ingredients taking advantage of the more than 6 million tons of bagasse and 1 million tons of yeast generated in the production of beer, which “have a lot of value as vegetable protein”.

Through a hydrolyzing process, which consists of breaking down the protein from by-products to make it smaller and more digestible, the specialists at this center have developed feed for gilthead bream -model for the Mediterranean-, sole -for the Atlantic- and trout -fresh water model-.

A panel of consumers tested the fish fed with these feeds and others fed with commercial feeds “and they have not noticed any difference”, which shows that the final productit does not alter the taste or texture of the fish “, ha explained Orive.

Take advantage of something that is going to be thrown away and reduce the exploitation of marine resources is the idea behind this initiative, which could also be applied in the creation of feed for other animal species, although the current line of research has focused on aquaculture because “it is a sector with growing demand.”

A magic mix: detergent with used oil

Recycled is also the oil used by the company Souji, whose creators looked for alternatives to reuse used oil at home and they managed to transform it into a cleaning product used to wash clothes, as a detergent or scrubber.

Souji, which means “cleaning” in Japanese, is a liquid made from minerals and vegetables that, when mixed in the correct proportions with used cooking oil and shaken for a minute, becomes a detergent that is “a 96% less polluting than ordinary brands ”, explained the company’s co-founder, Catalina Trujillo.

“The same result is achieved as with the traditional soap-making process but in one minute and without the need to use dangerous products, like caustic soda“, He added, before explaining that one of the main obstacles they encountered for their commercialization was breaking the false idea of ​​some customers that the garments” would smell like oil instead of clean clothes. “

Trujillo stressed that this initiative “is not just a detergent, because our focus is recycling”And in that sense the sustainability “It is present throughout the cycle”, with reused and reusable packaging.

A lettuce turned into furniture

The circular economy She is also the protagonist of the Aragonese company Feltwood, in charge of giving value to residues of agricultural and vegetable origin and transform them into packaging, furniture and insulation for construction, among other products.

“The planet cannot accept as much waste as we produce,” warns its director, Arancha Yáñez, who put this project on the mark by detecting demand for materials with good technical characteristics that they will not generate an environmental problem.

Taking into account that “40% of what is grown is not valid for food”, the company began to use the vegetable waste as alternative options to plastic and wood, until you get Ecological, biodegradable and compostable products, without using adhesives or binders.