Can strategies mitigating harmful algal blooms (HABs) be implemented everywhere?

In our previous post, we explored the effectiveness of HAB mitigation strategies adopted during the 2008 Beijing Olympic Games. Specifically, we identified the strategies’ lack of focus on anthropogenic water pollution to be problematic, and proposed that Qingdao officials should tighten waste disposal regulations while investing in specialised wastewater treatment.  

While these strategies appear foolproof in principle, they may not be effectively implemented in reality. This is especially so across space, where political and socioeconomic contexts vary and influence countries’ abilities to implement these strategies. Firstly, ramping up investments in advanced treatment technologies can be extremely costly, making it a financially unfeasible option in less affluent countries. Modern treatment systems that adopt high-tech processes such as the removal of residual contaminants (specialised treatment) can cost billions of dollars, notwithstanding additional costs of building pipes connecting these systems to areas with pollutive activity (Hill, 2012). Hence, such investments can be a financial burden for developing countries, potentially offsetting the economic returns from Olympic-induced tourism.

Wastewater treatment technologies that focus on specialised treatment are costly for developing countries, influencing their ability to adopt them when managing HAB growth (Wilo, n.d.)

In Qingdao, for example, nearly $100 million was spent on algae clean up at the 2008 Beijing Olympic Games (Glibert, 2014), on top of its hefty $17.5 billion Olympic budget (Mol, 2010). $100 million in losses was also incurred by Qingdao’s stronghold abalone and sea cucumber industries (Glibert, 2014), which saw record low yields. Therefore, investing in specialised treatment technologies was only likely to threaten Qingdao’s financial position, as Chinese cities did not receive central government funding. Although such investments could arguably reduce algae clearance costs in the long-term, the massive short-term outflow of capital would be too much to handle, potentially requiring countries to obtain loans from supranational organisations. This reinforces the financial unfeasibility of implementing advanced treatment technologies in developing countries.

Secondly, although regulating agricultural-related point sources can help to nip anthropogenic water pollution in the bud, countries might not have the political will to do so. In countries that heavily rely on the agricultural industry for economic growth, the amount of chemical waste produced is positively correlated to the industry’s growth. As such, managing waste disposal is challenging as it would inevitably involve the capping of farming operations and amount of profits earned. In 2011, the sudden accumulation of Ulva algae in the French province of Brittany coincided with the rapid expansion of livestock farming (Smetacek and Zingone, 2013). As the meat industry was integral to Brittany’s economy, local officials argued that HAB formation was inevitable as nutrients were continually released via animal manure (Smetacek and Zingone, 2013). In fact, eutrophication rates surpassed those of manure treatment, meaning that regulating these rates would either involve reducing livestock numbers — an economically unfeasible option — or investing in treatment technology. This illustrates the conflict between economy and environment, where countries might be unwilling to regulate waste disposal for fear of jeopardising growth. Furthermore, the regulation of agricultural practices, as with all policies, takes years to implement (Smetacek and Zingone, 2013). Hence, whether policymakers can maintain political will remains uncertain, amidst more pressing objectives of increasing economic influence through mega-events like the Olympic Games.

Developing countries might not have the political will to regulate waste disposal, as doing so has adverse effects on agricultural growth (Damara Bali Foundation, 2019)

So, does this suggest that HAB formation is a problem that cannot be solved? Certainly not! However, acknowledging the economic obstacles that stand in developing countries’ paths can facilitate the conceptualisation and implementation of context-specific HAB mitigation strategies. More importantly, officials should seek to understand the growth dynamics of various algae species, as only then can they manage HABs in a cost-effective manner.

References

Damara Bali Foundation. (2019). 25 farmers have been trained in compost making made of animal manure & agricultural waste [Online image]. Damara Bali Foundation. https://www.damara-bali.org/25-farmers-have-been-trained-in-compost-making-made-of-animal-manure-agricultural-waste/ 

Glibert, P. M. (2014). Harmful Algal Blooms in Asia: an insidious and escalating water pollution phenomenon with effects on ecological and human health. ASIANetwork Exchange, 21(1), 1-17. https://doi.org/10.16995/ane.46  

Hill, M. K. (2012). Water Pollution. In M. K. Hill (Ed.), Understanding Environmental Pollution (pp. 236-285). Cambridge University Press. https://doi.org/10.1017/cbo9780511840654 

Mol, A. P. (2010). Sustainability as global attractor: The greening of the 2008 Beijing Olympics. Global Networks, 10(4), 510-528. https://doi.org/10.1111/j.1471-0374.2010.00289.x 

Smetacek, V., & Zingone, A. (2013). Green and golden seaweed tides on the rise. Nature, 504(7478), 84-88. https://doi.org/10.1038/nature12860 

Wilo. (n.d.). Clean water for Qingdao [Online image]. Wilo. https://wilo.com/tw/en/Solutions-Provider/Global-references/Clean-water-for-Qingdao/ 

Blooming algae problem caused by water pollution stirs trouble for Olympic teams (2)

How often does one spot a floating carpet of algae at the Olympic Games? That was a question that Qingdao government officials had, when the city’s Olympic sailing venues were struck by unprecedented HAB formation in 2008 — the first such event in the Olympic Games’s 112-year history. The rapid spreading of algal bloom not only posed threats to aquatic species by releasing toxic hydrogen sulphide during decomposition (Glibert, 2014), but also disrupted sailing training and test events. As such, this warranted the implementation of large-scale mitigation strategies, which unfortunately proved ineffective as they overlooked the root cause of HAB growth — anthropogenic water pollution. 

The strategies adopted by Qingdao officials were primarily focused on clearing existing traces of algal bloom, given their priority to reduce event disruptions and maintain their image as a competent host city. As reported by Hu and He (2008), the immediate measure taken was to dispatch manpower to dredge the waters, with nearly 10000 locals and 1000 vessels being roped in. Following this massive clean-up exercise, where over 700000 tons of algae were collected (Hu and He, 2008) and $100 million of losses was incurred (Glibert, 2014), officials deployed containment booms to protect sailing areas against HAB infestation. Approximately 24 kilometres of containment booms, which refer to floating barriers typically used to contain oil spills, were used (Hu and He, 2008).  

 

Massive numbers of vessels — and even bulldozers — were deployed to dredge the algae-infested waters in Qingdao’s sailing venues (Cohen, 2008)

However, these measures turned out ineffective, with traces of algal bloom reemerging shortly after affected areas had been weeded (Cohen, 2008). While clean-up and containment strategies were admittedly necessary as HAB growth was disrupting the running of the Olympic Games, they failed to address the central role of water pollution in facilitating such growth. As mentioned previously, HABs develop when surplus nitrate and phosphorus from fertilisers or organic waste lead to nutrient excesses crucial for HAB formation (Hill, 2012). This shows that HAB formation in Qingdao was not the result of algae invasion from offshore areas as officials had suggested (Leliaert et al., 2008), but rather, the localised dumping of waste. These findings are supported by Leliaert et al. (2008), who argue that HABs in Qingdao were triggered by eutrophication — the process where water bodies continually receive nutrient input and eventually disappear (Hill, 2012).

Hence, it was unsurprising that officials’ mitigation strategies failed as point sources were not regulated, resulting in high HAB growth rates of 21.9% daily (Smetacek and Zingone, 2013). Specifically, officials could have advised farmers against dumping chemical waste into tributaries (Smetacek and Zingone, 2013) while investing in wastewater treatment infrastructure. By undertaking specialised treatment (Figure 1), where excess nitrate and phosphorus are thoroughly filtered out (they are only partially removed during primary treatment), eutrophication could have been prevented alongside HAB growth. Manpower could also have been significantly cut back on, bringing major cost savings for officials while making the 2008 Beijing Olympic Games a more financially sustainable one. 

Figure 1: Wastewater treatment process (Hill, 2012)

References

Cohen, C. (2008, July 3). China’s blooming algae problem that’s swamping the Olympics. Daily Mail. https://www.dailymail.co.uk/news/article-1031444/Chinas-blooming-algae-problem-thats-swamping-Olympics.html 

Glibert, P. M. (2014). Harmful Algal Blooms in Asia: an insidious and escalating water pollution phenomenon with effects on ecological and human health. ASIANetwork Exchange, 21(1), 1-17. https://doi.org/10.16995/ane.46  

Hill, M. K. (2012). Water Pollution. In M. K. Hill (Ed.), Understanding Environmental Pollution (pp. 236-285). Cambridge University Press. https://doi.org/10.1017/cbo9780511840654 

Hu, C., & He, M. X. (2008). Origin and offshore extent of floating algae in Olympic sailing area. Eos, Transactions American Geophysical Union, 89(33), 302-303. https://doi.org/10.1029/2008eo330002 

Leliaert, F., Malta, E. J., Engelen, A. H., Mineur, F., & De Clerck, O. (2008). Quindao algal bloom culprit identified. Marine Pollution Bulletin, 56(9), 1516-1516. https://doi.org/10.1016/j.marpolbul.2008.08.004 

Smetacek, V., & Zingone, A. (2013). Green and golden seaweed tides on the rise. Nature, 504(7478), 84-88. https://doi.org/10.1038/nature12860

Blooming algae problem caused by water pollution stirs trouble for Olympic teams (1)

Water pollution need not take its form in unsightly swathes of untreated waste. Sometimes, it can manifest in harmful algal blooms (HABs), whose cheery green hues belie their toxic and troublesome nature.  

Normally, algae is harmless, and is integral to the aquatic ecosystem as it forms the base of the food chain (Glibert, 2014). Yet, it can threaten aquatic species’ lifespans and human health when accumulated in large amounts (Fistarol et al., 2015). In the presence of untreated waste, such as organic matter or unused fertilisers containing reactive nitrogen and phosphorus (Hill, 2012), nutrients are abundant and absorbed by algae. This facilitates large-scale HAB formation, producing toxins that not only accumulate in seafood but also cause water contamination (Fistarol et al., 2015). HABs are hence considered to be water pollutants, as they alter water quality and spread at unmanageable rates characteristic of transboundary water pollution (Hill, 2012).

HABs are notorious for killing aquatic species and causing harm to human health by contaminating seafood (Davies, 2015)

Recently, HABs have entered the spotlight — not for causing fish kills and disrupting the global aquaculture industry (Glibert, 2014), but rather, the Olympic Games. Most notably, HABs of the Enteromorpha prolifera species were spotted at sailing venues in Qingdao (Glibert, 2014) leading up to the 2008 Beijing Olympic Games. This was attributed to the widespread dumping of nitrogen-containing farming chemicals into inland lakes that eventually flowed into Qingdao’s Yellow Sea (Branigan, 2008), where sailing venues were located. Such HAB formation was not only problematic as the island-city’s famed pristine blue waters were stained a bright green, but also because the blanket of algae hindered sailboats’ movements. As reported by Glibert (2014), the scale of HAB growth amounted to a sizable 1900 square kilometres, with nearly one-third of the competition area being covered in algal bloom. This caused blockage to practice routes while preventing Olympic athletes from sailing through the waters smoothly, thus compromising the efficacy of their training. As British windsurfer Bryony Shaw had then cautioned, “If [the algae] is still here in August [when we compete], it could be a real problem.”

Sailing venues in the Eastern Chinese city of Qingdao were plagued by HAB growth prior to the 2008 Beijing Olympic Games, hampering Olympic sailors’ training (Barlow, 2008)

Although the thick algal mass was eventually cleared and Olympic sailing events could proceed as planned, questions remained as to whether HAB formation could be more effectively mitigated. This was particularly of interest to aspiring host cities with tropical climates, as the fertilising effect of nitrogen and phosphorus was reportedly higher in warm regions (Marris, 2008). The following posts will hence evaluate the mitigation strategies adopted during the 2008 Beijing Olympic Games and whether they can be replicated elsewhere, so stay tuned!

References

Barlow, K. (2008). Algae swamps Olympic sailing city [Online image]. ABC News. https://www.abc.net.au/news/2008-06-28/algae-outbreak-hampers-olympic-sailing-preparations/2487806  

Branigan, T. (2008, June 30). Chinese race to clear algae from Olympic sailing venue. The Guardian. https://www.theguardian.com/environment/2008/jun/30/pollution.olympicgames2008 

Davies, W. (2015). Tonnes of dead fish removed from Rio Olympic rowing venue [Online image]. BBC. https://www.bbc.com/news/world-latin-america-32345508 

Fistarol, G. O., Coutinho, F. H., Moreira, A. P. B., Venas, T., Cánovas, A., de Paula Jr, S. E., … & Thompson, F. L. (2015). Environmental and sanitary conditions of Guanabara Bay, Rio de Janeiro. Frontiers in microbiology, 6, 1232. https://doi.org/10.3389/fmicb.2015.01232 

Glibert, P. M. (2014). Harmful Algal Blooms in Asia: an insidious and escalating water pollution phenomenon with effects on ecological and human health. ASIANetwork Exchange, 21(1), 1-17. https://doi.org/10.16995/ane.46 

Hill, M. K. (2012). Water Pollution. In M. K. Hill (Ed.), Understanding Environmental Pollution (pp. 236-285). Cambridge University Press. https://doi.org/10.1017/cbo9780511840654 

Marris, E. (2008). Scientists identify algae that almost swamped the Olympics. Nature. https://www.nature.com/articles/news.2008.998