Sreenath Bolisetty

Sreenath Bolisetty co-founded BluAct Technologies in 2016 to do something that sounds like a joke until you read the data: clean water with whey protein, the leftover from cheese-making that bodybuilders buy by the tub. During his years as a senior researcher at ETH Zurich, Bolisetty and his professor Raffaele Mezzenga found that if you denature that whey into amyloid protein fibrils, which are tiny self-assembled protein threads, and bind them to activated carbon, you get a membrane that grabs heavy-metal ions out of water and holds them. Their 2016 Nature Nanotechnology paper put a number on it: heavy-metal concentrations drop by three to five orders of magnitude on a single pass, and you can run it again and again.

Sreenath Bolisetty likes to call the material food-grade, because both halves of it, the whey protein and the activated carbon, are things you could eat, and the whole thing is manufactured wet, with no plastics. That matters for cost and for reach, because with a granulated version the filter runs on gravity alone, no electricity, which is exactly what you want in a place with bad water and no grid. And it is not picky about the poison. BluAct's membranes have pulled out heavy metals, pesticides and pharmaceuticals, precious metals like gold and platinum, and in a 2020 ETH study, radioactive elements from hospital effluent at over 99.8% in one filtration step, which put BluAct into talks about Fukushima.

Sreenath Bolisetty did not arrive at water by accident. He grew up in Nalgonda, a district in India that is well known for the wrong reason, fluoride in the groundwater, and he watched friends develop bone problems from drinking it. So when his lab work on recovering metal ions from mining waste showed him that the same protein fibrils could clean drinking water, the market math and the personal math pointed the same way. As he put it on the show, he realized he could find a meaningful career, because he grew up in a place where the water was not very safe to drink.

Sreenath Bolisetty has spent the years since taking the technology from the ETH lab into the field, running pilots across Europe, South America, Asia, the US and Australia, including a year-long study in Peru where, with the Swiss Embassy, BluAct tackled groundwater arsenic running about a hundred times over the safe limit. His ambition is deliberately un-flashy: one robust filter that an ordinary person, not a specialist engineer, can fit under a kitchen sink, doing the job that energy-hungry reverse osmosis (the high-pressure membrane filtering most bottled and desalinated water relies on) does today, but without the energy bill or the wasted water. It is the kind of unglamorous, deeply-technical water story I built my Leviathan database to keep track of.

“Our secret sauce is milk. Even the bodybuilders, when they want to build a body, they use this whey protein. We do some nanoengineering of this milk protein, and then these protein fibers are our active component, especially in the adsorption of heavy metal ions.”