wastewater

20181112: Desk | Kitchen

I resumed my work for OSF today and Murphy's law ruled the morning. All of the most recent Premiere and After Effects files were not uploaded to the cloud, nor copied to my hard drive. To recreate all of the work necessary to be in a position to complete what I was intended to finish this week, would itself require a week of work. I searched everywhere three times before contacting my supervisor and inquiring about the possibility of him logging into my laptop and copying all the .aep and .pproj to box. Afterward, I changed my Okta password.

The time difference meant that the morning was spent researching exactly what was left outstanding and the evening, after I had received the files, were conforming the tasks to the current files. I worked 16 hours Monday.

Later in the evening Dr. Steven Weiss, a marine biologist from Uni Graz, met me at Preisterseminar to talk about the Murkraftwerk and the Zentraler Speicherkanal. Since my project was an extension of the Illinois River Project, I started by asking him about carp. Native to Central Europe, carp were part of the local sport fishing as well as holiday carp recipes. Weiss didn't have a recipe that he personally enjoyed; the recipes he did enjoy consisted of heavily disguising the flavor of the fish with something else. As bottom feeders that can thrive in toxic waters, the carp topic framed the following question about the condition of the Mur.

Historically river had been very polluted, even to the point that some people avoided it, or warned others to stay away from it. But an aggressive clean up had started in the 1980s, in part by ecological movements that have gotten hold after the postwar period when food, subsistence and class were at the forefront of sociopolitics in Austria. But the river was still heavily polluted, although huge improvements had been made.

There was already a chain of hydropower plants on the Mur, so the ecology had already been greatly altered. But the little life that persisted was going to be squeezed out. Each accumulation of life that formed behind the dam would be washed away each time the locks were opened. Steve’s concern was for life, biodiversity and he was open about his indifference to wastewater entering the river through overflowing sewer pipes; that was where the biggest fish were. When a river is polluted, it can be cleaned up and life will return, if the headwaters are still functional. But once a river is dammed, its amputated until that structure is removed.

In the minds of most Austrians hydropower was considered a clean, renewable energy. Although late getting out the door, when the information about the Murkraftwerk was publicized it was sold as cleaning up the river. Weiss saw this as a deliberate misrepresentation, contesting that the amount of organic matter that would diverted from the Mur was less than 2% of what was already in the river when the waters were in Graz.

The term “water rich” doesn’t just describe having water as a natural resource. If that were the case, every coastal city would be water rich. When Austria is referred to as ‘water rich’ it more accurately describes the value that pure water has to the people but also the wealth that has been extracted from water ways, such as through hydropower. Weiss stated that hydropower has a long history in Austria: since the beginning of the 20th century, not a single year has passed without the construction of a hydropower plant. At one point most of the electrical power used in Austria came from hydropower. In 2018, it produced about 60% of the electricity consumed. And, as wealth grows in Austria, consumption is expected to grow.

In Steve’s opinion the biggest environmental problem in Graz was not the management of the Mur river, but he air quality. The fine particulate matter in the air collected in the city center with wind stagnating due to the surround hills. And as the city population grew due to Austria urbanization and immigration initiatives, traffic would increase and the condition would become worse. The fact that the Murkraftwerk felled thousands of trees pinpointed his opposition to the project.

The representation that Austria is green is, by Weiss’ metrics dishonest or at least misleading. The image was really about being tidy or clean, but not environmental. He noted a number of regressive practices that included very poor encouragement for organic farming from the central government, and outdated management techniques of fisheries and wildlife, and a general disregard for biodiversity. Local protections were flawed and companies held considerable influence over their regulations that should have governed them. The Murkraftwerk summarized these poorly order priorities.

Steve joined the protest by accident and was reticent to get involved in a small country in which everyone knew everyone. But he became one of the faces of the protest, due to his scientific background as a marine biologist. But when the trees were finally downed, and the Speicherkanal and hydropower plant moved forward, he was devastated. The city had been ripped apart, governmental coalitions broke up, people’s lives were smothered. He had to come to terms with the mantra of never giving up while being prepared to lose.

What was amazing about talking with Steve was that his perspective was at once informed both from the very local, the very specific case study, but also by the larger cycle. He thoughts flowed fluidly between the technologies that were yet to be adapted and the very old. He used the notion of the swamp as the core of medieval fear to demonstrate how our perceptions of nature and cities have changed. He framed the pursuit of modernity in terms of how Mur had been straightened, motivated by normalization property lines, but the example gave a visual reference to how this pursuit had played out: When a river is channelized, the riverbed deepens because the currents move more quickly, the water digs at the earth. The water table sinks. Erosion at banks occurs, sometimes destabilizing bridges and roads. The Banks towered over the surface of the Mur by at least four meters. But his general point was why should the city be concerned about a small improvement in the water quality of a polluted river if the entire ecosystem in the water would be destroyed?

20181126: Wasserwerkgasse | Waste Treatment Plant

Werner Sprung greeted us in his office at 9 am. Two plates of pastries, a jar of water taken directly from the groundwater, and an espresso. The onsite lab at Holding Graz tests the groundwater daily for pollutants. The site is a water protection area. The building is new, compartmentalized with electronically locked doors and nearly no overhead lights required. Floor to ceiling windows illuminated the hallways. A modest two stories but thoughtfully laid out with a parking garage partially below ground level.

Before we began filming Werner stated that he trusted we wouldn't use the video for the Green Party, who would rather "throw Molotov cocktails" at him. I assured him that my interest was artistic and not propagandistic and that, while I intended to express the concerns of members of the activist group, my aim was to show the ZSK as an urban design project. I was transparent about my intention to ask him about the protest during the interview and he agreed.

Sprung showed us a presentation of the Zentraler Speicherkanal on powerpoint that included the profile of the city and the sewer system. The extent of the catchment area, the age and history of the sewer system. The statistics that he drew out, one of which was repeated, was that the combined sewer overflow would reduce 70% of the untreated wastewater entering the Mur. Prior to the ZSK only 30% of the combined sewer overflow is treated when there was rainfall. A few minutes into the presentation I realized that the only thing more mind-numbing than a powerpoint presentation is a powerpoint presentation on video. It’s not the content nor presenter, it’s the format. The audio into the C100 had reset to microphone rather than XLR when I unplugged it for transport and most of the footage was unusable. Amateur mistake.

The rainwater diversion was a motivating factor that I had heard again and again. But the benefits of the ZSK were not just reducing untreated wastewater entering the river, but the additional storage that would allow for Holding Graz to clean and renovate the existing sewers, some of which are over a century old. Currently, in order to renovate sewers, a line would be closed and the wastewater would be diverted to the Mur, increasing contamination.

The origin of the sewers in Graz followed a deadly flood in 1880 (1860?), the creeks were covered to reduce flooding; subsequently the pipes of homes were connected to the covered creeks. The idea of connected a rainwater runoff to the existing covered creeks was to wash away the smell that accumulated in the sewers.

Werner's response to the protest was that he could not understand why anyone would be against the improvement of the water quality of the Mur. He described how brown streaks can be seen on either side of the Mur during rainy days, and how anything, even bicycles, can be found in a sewer. He laughed at the suggestion of ignoring the organic waste that entered the Mur because fish liked it. His role at Holding Graz was system optimization. It was in his essay that I had first learned about the ZSK.

After the presentation, Sprung offered to show us the wastewater treatment plant.

The great thing about a city employee is they usually know a lot about random information about the built environment that would be otherwise difficult to obtain. While visiting the Schloßberg I had noticed that buildings in Graz are almost uniformly capped at four stories. The explanation, Sprung said, was that the building regulation was informed by the air quality concern for stagnating pollution that is typical for the geographic location of a city at the base of a mountain range. That is, the concern for the tiny particulate matter that the tree defenders were describing was already inscribed into the city code. But if growth was underway and height is capped, then the result is sprawl.

We passed through a 10 km long tunnel, part of the freeway that passed under the city. The design of this tunnel, Sprung noted, was a compromise between planners who wanted to add a freeway through the city and opposition that worried about the effects of automotive amputation. (It reminded me of an alternate universe in which Robert Moses’ Cross-Bronx Expressway had been designed with an iota of compassion for community.) Fortunately, tunneling is a specialty of the Austrians, and can be seen in the Schloßberg tunnels, which were used as bomb shelters in WWII. Under the Graz Hauptbahnhof there are tunneled wine cellars, no longer in use, and of course the sewer and combined sewage overflow, which are also tunnels, though constructed differently than the technique Sprung described, that is produced through the use of explosives, allowing the surrounding rock to collapse to a certain distance to increase the load pressure, like a keystone arch, before being reinforced with metal and then covered in cement. The Montanuniversitaet Leoben is one of the institutions that specialize in this peculiar form of engineering.

At the treatment plant, Werner walked us through the stages of purification, from untreated water to initial solid suspension and separation, large and small sand and gravel, bacterial treatment in anaerobic digesters (which predate New York’s Newtown Creek facility by three decades), into another holding tank and out to the final stage before being sent into the Mur. The water isn’t potable, but there are plans to implement higher purification, such as pharmaceuticals, in the coming decade. I asked Sprung about the impetus to create the wastewater treatment plant, whether the European Union Wastewater Framework directive included mandatory renovation of the sewer system. It did not, he answered, because such a directive could not be enforced across the continent, due to a lack of funding. We saw only two other people while on the tour; most of the processes in the plant must be automated.

20181127: Technische Universitat | Zentraler Speicherkanal

Holding Graz and Technical University collaborate on developing technologies for urban management–functional systems of analysis, data and spending. The term that came up again and again when talking with experts from these institutions was "clean water.” What is “clean” exactly?

In contrast to the Dakota Access Pipeline, the Tar Sands, or even the EU's ITER energy project, Graz's contestation of the ZSK was uniquely Austrian. While North Americans militarize against protesters opposed to non-renewal, fossil fuel energy, or the French protest against nuclear energy, the ZSK is the center of three parties that all fight environmental improvement, although each party has a different notion of what that entails. The city, represented by Holding Graz, aims to reduce the untreated wastewater entering the Mur. Their position is water quality. The hydropower plant hopes to produce renewable energy for Graz. And the activists are concerned for the ecological well-being of the river, fish, snakes and the trees.

The perception of hydropower plant is duplicitous because many Grazers deduce their intentions as strictly monetary. The fact that the second largest political party in Graz has traditionally been the Communist party, exaggerates the opposition to financial interest over environmental and social benefit. Compounded with the political negation of surveys and grassroots activists who mobilized a referendum on the issue, the frustration of impunity adds insult to injury. But, as Steve Weiss stated, the general perception in Austria of hydropower is positive. Even on a global level, hydropower is considered renewable energy. At COP24, the EU lauded hydropower as a clean source of energy (the political point was that COP24 was in Poland where the right-wing government is supporting the use of coal).

Dr. Kainz, who was the department chair and now the rector of the Technische Universitat, was the Godfather of the ZSK, brokering the benefits between Verbund, which needed traction for their hydro power plant, and Holding Graz, which needed a sewer extension. Kainz had directed me to Gruber as a contact who would speak about the TU’s involvement and design of the ZSK project. Gruber's research began in 2002, when his team began studying the quantities of sewer overflow in the Graz catchment area. His research video has been used in educational settings for the last decades, and I recognized some of the footage from Werner Sprung's presentation.

It was 2pm and overcast; the late-November daylight was bluing. Günter took us to the ZSK construction site. I was hoping to enter the ZSK. We started on a bridge to nowhere, a blockaded extension that overhung the Mur by a few meters. In rainy times, rainwater enters the same drainage canals in the sewers as is used by wastewater from houses and buildings. Because the surface of the city is polluted with toxins, it’s necessary to treat it, especially after the first rain. But excesses of both greywater and rainwater spill out of the channels along the sewers and join the flow of the covered creeks and river, exiting to the Mur at an outpoint. The Zentraler Speicherkanal spans 3 kilometers and connects to exists sewer overflow points, effectively catching the wastewater before it enters the Mur and stores it in compartments that are separated by movable weirs. When the wastewater treatment plant is no longer at capacity, the weirs drop, causing a wave motion, which causes the wastewater to disturb the settled sediments on the floor of the storage canal and wash everything down to the treatment plant. Günter explained all of this from his perch on the bridge, which he explained was used for dumping snow into the Mur. From the bridge he pointed out R 05, the first wastewater outpoint that he studied back in 2002. (Why untreated snow was being dumped into the river, given the polluted surfaces from which it is plowed, while rainwater is diverted, mixed with stored and requiring more funding in the name of the ZSK was not specified.)

It's curious that all three groups of interviewees–the activists Regelsberg and Ulls, Sprung and Gruber–all foresaw and called for the integration of green and blue solutions, like roof gardens, bioswells, and tree planting. The difference was the scale of efficacy that each party claimed. The activists implied blue and green initiatives could have substituted the net effect of the ZSK. Sprung suggested it would be necessary in the future. Gruber stated that it depended on the profile of the city, but that pipes were almost always necessary to solve the problem of flooding and surface pollution run off.

We crossed the pedestrian bridge to see the movable weirs that were under construction. The hydropower plant would raise the height of the Mur by 6 meters at the dam. I asked how close to the underside of the bridge it would be, and guest a few meters; he confirmed my estimate, but I presumed it was a translation issue.