Connect with us

Hi, what are you looking for?



Self-Destructing Microbial Robots Turn Wastewater Into Gold Mine

Since we’ve been on something of a wastewater tear this week, let’s keep the ball rolling with a look at another form of new technology for harvesting renewable energy from the stuff. This one is from a company called Pilus Energy. The company has tweaked bacteria to come up with proprietary energy-harvesting organisms it calls BactoBots™, leading to a new generation of high efficiency microbial fuel cells.

A Next-Generation Microbial Fuel Cell

While other wastewater-to-energy systems involving organisms have exploited the digestive or fermentation pathways, Pilus Energy has focused on the metabolic pathway.

Bacteria create renewable energy from wastewater.

Courtesy of Pilus Energy.

So far, Pilus has released two products, RemdiBot and GalvaniBot. We’re especially interested in GalvaniBot, which forms the heart of what the company calls a next-generation microbial fuel cell. Here’s the connection, as explained by Pilus:

Most bacteria can gain energy by transferring electrons from a low-potential substrate, such as glucose, to a high-potential electron acceptor, such as, for example, molecular oxygen, a process commonly referred to as respiration. In humans, the mitochondria represent the metabolic “furnaces” that perform the same function…Essentially, our organism possesses nearly identical energetic properties of the human mitochondrion. In fact, many scientists believe that human mitochondria have evolved from bacteria [more details here].

In addition to generating electricity, GalvaniBot reduces hundreds of organic pollutants in wastewater into high value products, namely renewable hydrogen and methane.

That helps to resolve a problem we noted earlier, which is that the energy density of wastewater is quite low compared to other renewable feedstocks. By extracting more high-value products from wastewater, the BactoBot system has the potential to be cost-effective.

The Go-Anywhere Self Destructing Robot

Pilus has come up with a couple of other interesting tweaks to the microbial fuel cell concept. It has protected its proprietary bacteria with a “key” in the form of a non-toxic additive. Without the additive, the BactoBots quickly die off or self-destruct. In addition to forestalling theft of the genetic code, the key helps to prevent the engineered bacteria from drifting into other environments.

Another aspect of the system is its scalability and portability. In addition to use at large, centralized municipal wastewater facilities, the system could prove cost-effective at residential, commercial, and industrial sites of various sizes, as well as schools and other institutions, and public facilities.

Depending on its mobility, scaled-down versions of the system could also be used at temporary camps (including temporary military bases) and construction work sites.

The system could also serve as an on-board wastewater-to-energy reclamation system on ships, which would open up a boatload of possibilities including cruise ships and military vessels. In that regard, the US Navy is already quite interested in microbial fuel cells.

Follow me on Twitter and Google+.



Sign up for daily news updates from CleanTechnica on email. Or follow us on Google News!

Have a tip for CleanTechnica, want to advertise, or want to suggest a guest for our CleanTech Talk podcast? Contact us here.

Former Tesla Battery Expert Leading Lyten Into New Lithium-Sulfur Battery Era — Podcast:

I don't like paywalls. You don't like paywalls. Who likes paywalls? Here at CleanTechnica, we implemented a limited paywall for a while, but it always felt wrong — and it was always tough to decide what we should put behind there. In theory, your most exclusive and best content goes behind a paywall. But then fewer people read it! We just don't like paywalls, and so we've decided to ditch ours. Unfortunately, the media business is still a tough, cut-throat business with tiny margins. It's a never-ending Olympic challenge to stay above water or even perhaps — gasp — grow. So ...
If you like what we do and want to support us, please chip in a bit monthly via PayPal or Patreon to help our team do what we do! Thank you!
Written By

Tina specializes in military and corporate sustainability, advanced technology, emerging materials, biofuels, and water and wastewater issues. Views expressed are her own. Follow her on Twitter @TinaMCasey and Spoutible.


You May Also Like

Clean Power

If all goes according to plan, one wastewater treatment plant in California will demonstrate a solar power and energy efficiency model for others to...

Clean Power

Berlin gets creative with renewable energy and energy storage in race against Russian gas cutoff this winter.


The new Northvolt factory will use recycled wastewater for cooling.


Back in January, I wrote an article about how Steel Dynamics had plans to dump E. coli and more toxins into Texas freshwater*. In...

Copyright © 2023 CleanTechnica. The content produced by this site is for entertainment purposes only. Opinions and comments published on this site may not be sanctioned by and do not necessarily represent the views of CleanTechnica, its owners, sponsors, affiliates, or subsidiaries.