Ultrasound May Be Another Solution For Dying Lake Atitlan
Critics claim solutions are being overlooked, ignored; government response only ‘a lot of talk’
By Greg Szymanski, JD
March 12, 2010
The type of cyanobacteria or green algae creating havoc at Lake Atitlan, threatening its very existence, is fast becoming a world wide epidemic.
According to scientists, many other fresh water lakes in America and other parts of the world are experiencing the same toxic blooms that occurred at Lake Atitlan in October 2009.
The difference, however, are solutions have been slow to come by or even non existent in Guatemala.
While lake rescue efforts and treating health concerns have become a major priority at other lakes in the world with much time and money being spent, the life threatening problems at Atitlan are being downplayed and virtually ignored. To add injury to insult, very little money has been spent to correct a very serious problem.
According to researchers, these attitudes could prove to be a costly error for those at Lake Atitlan, an error that could result in the loss of animal and human life as well as the life of a once vibrant and healthy lake.
“None of the villages around the lake are really dealing with the problem,” said a recent environmental researcher concerned about Lake Atitlan. “People there are even saying the lake is getting better without doing a single thing. That’s impossible.
“The water treatment plant promised by the government now in Santa Catarina Polopo is just a symbolic gesture if you know anything about Guatemala politics. Nothing will be done after that if it really does get done in the first place!
“I hope your group, the group being put together in the States and in Lake Atitlan can do something significant to get rid of the cyanobacteria.”
The researcher, who will remain anonymous so as to keep the lake project moving in a positive direction, spoke to the Arctic Beacon, referring to a non-profit group in the States and Lake Atitlan, forming to make sure the Atitlan’s problems get fixed and get fixed quickly!
The group called Save Lake Atitlan Mission is putting together a world wide web site to galvanize all interests working to save the lake as well as organizing a weekly radio show dedicated to Atitlan’s major environmental concerns.
The web site is due out in two weeks but in the interim contact gregbeacon at gmail.com if you’d like to get involved or if you have valuable information which could bring solutions or awareness to what is really going on at Lake Atitlan.
Once known as the most beautiful lake in the world, now Lake Atitlan, a 1000′ deep volcanic lake 130 square km in size, has been taken over by a massive bloom of cyanobacteria that is now entering its toxic phase ending the basic source of water for the thousands of lake shore inhabitants as well as halting the livelihood of indigenous fisherman.
Authorities on lake pollution in a recent gathering at Istanbul listed Lake Atitlan as the world’s most threatened lake in 2009. With haphazard garbage collection and no raw sewage and water treatment, the once crystal clear water is now undrinkable.
“Cyanobacteria are becoming a serious problem in surface waters worldwide,” said Dr. Alan Wilson, a Ph.D. in Applied Biology from the Georgia Institute of Technology and assistant professor in the Department of Fisheries and Aqua-Cultures at Auburn University.
“Nutrient enrichment from fertilizers, animal waste, human waste, sewage plants and other urban and farm sources has promoted these algal blooms. When blooms degrade, the algae use up dissolved oxygen in the water, thus ‘suffocating’ fish and killing them. The algae also produce toxins that can seriously affect humans and animals.”
In an effort to move solutions to the forefront, the Arctic Beacon has contacted a company called Eco-Tek in British Columbia, which recently provided an environmentally friendly waste water plant in Havana, Cuba, at a cost even affordable for an impoverished country like Guatemala.
Patrick Meyer, chief operating officer for Eco-Tek is excited about how his company could possible help the people at Lake Atitlan, but said he has never been contacted by anyone from Guatemala.
“In short, yes. This is something we can help with,” said Patrick Meyer, chief operations officer of Eco-TeKEcological Technologies, Inc. “Panajachel is reputed to be about 14,000 people. That’s far too many people to be going without water treatment. So, Panajachel did have a collection system and an existing site for sewage treatment. That makes things much easier and less expensive.
“The more I think about this opportunity the more excited I get. We have a low-cost opportunity to make a major change, a significant improvement on what is currently happening.”
“Also, take into consideration our facilities are not just about treating sewage; they’re about water re-use. We clean water to high enough standards that the water may be re-used for agricultural purposes. In Havana we created food producing gardens and an orchard as part of the project. Using this water for irrigation will reduce the toxic run-off from farms the area is presently experiencing.
“Costs for our system are minimal in warm climates. Our system is Havana would be most similar. It treats 300m3/day and cost $150,000. Further details of that project can be viewed at www.ecotek.ca/havana.html
“As an aside. A key consideration with any mechanical system is to keep maintenance costs in mind. Traditional sewage treatment systems can be extremely expensive when it comes to replacement parts. For our Havana project we really broke down the process and simplified it to eliminate most of the high-cost components. We estimated that operations/maintenance would cost $5,000 per year but I’d be surprised if it amounted to more than $2,000. Since then we’ve done further work on simplifying our system to the point that its hardly recognizable as a sewage treatment facility. Operation costs of the treatment facility should be zero.
“Vital information at the outset is two-fold. Understanding the waste we’re treating, and knowing that there is a source of revenue that can pay for the expenses. I would hope they would contact us or we can make initial inquiries as well now that we know they need help.”
Another company contacted by the Arctic Beacon, which could help at Atitlan, is Phoslock Water Solutions Ltd based out of Australia. This company produces a product which reduces phosphorus levels leading to toxic algae bloom. Their product is now being used in Italy’s Lake Varese to cope with the same type of algae bloom problem occurring in Lake Atitlan.
Although admitting Phoslock would not be a cure-all, Nigel Traill. regional manager for Phoslock in Europe, Africa and the Middle East, said possibilities should at least be explored to see if his company’s product could help in some small way.
“From what I have read on the internet, there are huge inputs of phosphorus entering the lake annually from external sources so addressing this is obviously going to be critically important in any strategy that is implemented.
“Having said that, eutrophication is generally caused by both external and internal phosphorus loadings and even once external loadings have been controlled/reduced, internal loadings of phosphorus remain and it can take several decades or even longer for lakes to recover naturally. Most of a lake’s internal phosphorus load is generally found in the sediments.
“Under certain environmental conditions (e.g. no oxygen in the deep water), the phosphorus will be released into the overlying water column in the form of phosphate, which is bio-available to algae. The algae grow by taking up by consuming this source of phosphate. When the algae complete their life cycle, they generally sink to the bottom of the lake and are broken down by bacteria. The phosphorus remains in the sediment until anoxic conditions develop again, at which time, the cycle starts again. The concept behind Phoslock is that it breaks this cycle by depriving algae of their food source.
“Although Lake Atitlan is a huge and very deep lake, it is possible that, with sufficient information about the distribution of phosphorus concentrations in the lake and an understanding of the main sources of the phosphorus that are driving the cyanobacterial blooms, targeted applications of “Phoslock could be undertaken in order to reduce this source of phosphorus.”
Realizing it will take many solutions from many different areas to save the lake and its people from over pollution, a recent article regarding how ultrasound can reduce toxic algae blooms, should also be considered by those working at Atitlan.
Here is an excerpt from an article by Duncan Graham-Rowe that appeared recently in the New Scientist Magazine. He should be contacted immediately to see if this innovative method could help.
BLOOMS of algae in lakes and seas can release neuro-toxins into the food chain or suffocate the local ecology by sucking up too much oxygen. When one occurs, the safest option is usually just to wait for the bloom to clear of its own accord, but now scientists at the University of Hull, UK, think they have found a way to put a stop to these deadly algal explosions- by exposing them to blasts of ultrasound.
The use of ultrasound has been explored before, but with mixed results. That may be because the mechanism was not well understood, say Michiel Postema and his colleagues, who successfully used ultrasound to kill off algae. Postema believes it affects buoyancy cells, known as heterocysts, which keep the algae afloat by enclosing a bubble of nitrogen gas. He reckons the ultrasound pressure wave causes the gas in the cells to resonate. At high intensity it bursts the cell, and the algae sink. “Without sunlight they will then die,” he says.
Postema and his team tested three different frequencies on a particularly harmful species of blue-green algae, Anabaena sphaerica, which can cause respiratory disease and liver cancer in humans who come into contact with it. Although all three frequencies worked to some extent, the most effective was close to 1 megahertz. That value matches the expected resonant frequency of this alga’s buoyancy cell, which is about 6 micrometres across (Applied Acoustics, DOI: 10.1016/j.apacoust.2009.02.003).
If they are right about the resonance mechanism, it would be good news, says Postema. Any method for clearing toxic algal blooms should do as little damage as possible to the rest of the ecosystem. “You need to be sure you avoid other harmless species,” says Deborah Long, conservation officer for the charity Plantlife Scotland in the UK. The ultrasound could be targeted to specific species of algae, because the resonant frequency of heterocysts varies from species to species in accordance with their size. What’s more, such a measure should not damage ordinary water-filled plant cells, which are relatively impervious to pressure waves.
These high frequencies are absorbed rapidly as they travel through water, and at 1 megahertz the effective radius is less than 20 metres, says Postema. So the technique may be more practical for clearing algal blooms in lakes and ponds than for large-scale red tides that can cover hundreds of square kilometres of sea.
Editor’s Note: Watch for tomorrow’s article on how Chemical Engineer Kirk Jones also has a proposal to improve waster water management at Lake Atitlan.
Also, see more of Greg’s stories below on Atitlan. If you want to help raise money, awareness and meet the immediate needs of the Mayans, contact gregbeacon at gmail.com Look for a new world wide web site coming out in two weeks, galvanizing interests worldwide to see the Mayans and Lake Atitlan are treated fairly. Also, a new weekly radio show will be broadcast highlighting Atitlan and the plight of all indigenous groups in North, South and Central America.