Friday, August 31, 2012

In praise of LCA thinking

I heartily commend to all environmental engineers (including fellow auspicious poop engineers!) the subject of Life Cycle Assessment (LCA), for several reasons:

  1. It makes you think holistically. It's easy to be miopically focused on one environmental impact - hypoxia, eutrophication, carbon footprint, acid rain, etc. - but an LCA makes you consider all potential impacts. I offer the crass example of focusing solely on carbon footprint for wastewater treatment... the lowest CF for sewage treatment is no treatment and just let the sewage go into the river, lake or estuary! Of course this causes untold environmental and health impacts.
  2. It makes you think globally. It's easy to look at your own litte corner of a village, town, city, state, or country, but, in our global economy an LCA expands your considerations to a global perspective. In a recent LCA we did, for example, we considered the impact of using methanol. In digging into the data we discovered that our methanol came from Trinidad who are using their significant natural gas reserves to produce higher value products such as methanol. Who'd have thought?!
  3. It makes you think systematically. Your treatment plant is one cog in a huge anthropogenic and environmental system. An LCA makes you think about wider environmental impacts and maybe the solution to reducing environmental impacts lies outside of the boundaries of your own system. In wastewater the example I like is that water conservation (i.e. using less water in your home and in industries) has a significant impact on the quantity of wastewater that has to be treated, but also reduces the energy needed to pump it, the pipes needed to convey it and the energy used in a home to heat it... the chemicals needed to treat it, the water stress from abstracting it, the land needed to dam it and use it... shall I go on? But wait, I'm just a poop engineer looking at the wastewater end right? Hmm. Thinking.
  4. It makes you think about sources. In a very recent project we did an LCA that included glycerine use. Our glycerine is sourced as a byproduct of soy bean processing for biofuels. Inadvertently we put glycerine sourced from Brazil in our model and it showed a very high carbon footprint due to land clearance in the Amazon. Bad. Oh wait, our byproduct is actually from the US where we don't need to clear rainforest to produce soy beans. We selected the US beans and now we have a net carbon reduction due to carbon sequestration for this part of the model. I guess "buy local" is the key! (Unless you live in Brazil... think about it!)
  5. It makes you think. Environmental science and engineering are fascinating and complex issues. LCA makes me stop and think. I was trained as a chemical engineer and throughout my career I've been a process modeler which means I have an appreciation for mass and energy balances. LCA has several definitions, but it's basically the mother of all mass and energy balances! Sure it's imperfect and in many areas it uses crude approximations, but hey, it makes you think, holistically, globally and systematically!
So, to all my fellow environmental engineers, I heartily encourage you to get into LCA. We use SimaPro, which is great, but there are several decent software packages out there to help you including a free one.


Friday, August 24, 2012

Conference season in Twitterland

In the next few weeks there are several conferences with wastewater foci and I'm planning to be at a couple of them. First up will be the International Water Association world water congress in Busan. Wait a minute! Did I just see they have an iPad app for the conference? Plus they have a Facebook site (of course), a LinkedIn group and their own hash tag, #iwa2012busan for Twitter! Wow, technology comes to conferences in a big way! Of course, being the geek that I am I must try them out!
Last year we tried using twitter for Q&A at the IWA/WEF Nutrient conference (#nr2011 if you're interested) with the intent that younger water professionals might feel less intimidated and submit their questions during the Q&A. In that respect it was a bit of a failure as the usual senior folks dominated the tweets as much as they liked to hog the mike during the verbal Q&A. What it turned into was more of a set of side conversations, which was OK and added a new dimension to the conference reminiscent of the days when conferences had more heated discussions and back and forth dialogue.

We tried a similar thing for #wwtmod2012 which worked OK but the folks hogging the mike stuck more with their traditional mike-hogging at that conference and didn't contribute as much to the twittering!

In 2011 and again in 2012 WEFTEC will be tweeting away on #WEFTEC. If last year is anything to go by it will mostly be used by vendors encouraging people to look at their stands and a few folks tweeting comments on the technical sessions. That's cool I suppose.

It will be interesting to see how these conferences make use of Twitter and other social media and how the attendees take to them.


Monday, August 13, 2012

Would a poop plant by any other name smell so sweet?

In our industry we're shifting how we look at wastewater treatment.  In fact to even say "wastewater treatment" may soon be a thing of the past.  The shift is to stop looking at "used water" as a waste product to dispose safely, and start to look at it as an opportunity to recover valuable resources.  Our used waters contain... water (yup, tricky one that), nutrients (particularly phosphorus), heat and organics.  Let's see what we can do to recover these resources.

So maybe me using "poop engineer" for my blog title wasn't such a smart idea?  But, hey, that's what I am and whatever you call it, it's a sweet topic to consider how we can take something with a negative image and turn it around to a positive!

Andrew Shaw: Week in the life of a poop engineer

Another previous post from my general blog... (gearing up to start the Poop Engineer Blog for real!)

Andrew Shaw: Week in the life of a poop engineer: This week was particularly varied so I thought it might be interesting to share it on my blog. So here goes (If I can remember because it ha...

Andrew Shaw: Wastewater Treatment Blog?

Andrew Shaw: Wastewater Treatment Blog?:  As I dip my toes into blogging, I've been considering the idea of starting a series of blogs specifically on wastewater treatment, possibly...