Slow River

I slapped it onto the magnet over my left breast. Sal Bird, age twenty-five, with two years’ experience at the waste-water depot of Immingham Petroleum Refinery would know that a GC was a gas chromatograph, and what it was for. Johne Hepple, though, was taking no chances.

“It’ll let you know if the atmosphere is contaminated to dangerous levels by changing color.”

“Industry standard?”

Hepple looked confused for a moment, then adjusted his expression to one of superior amusement. “Superior to standard, as is all the equipment used here.”

I nodded politely but mentally rolled my eyes. For now I’d just have to assume it used the standard color system, but if I got the job I’d make sure I asked another worker. If there was any kind of leak, I wanted to know exactly what I would be dealing with.

Hepple talked as we toured the plant. “The six city stations process more than twenty million gallons of household wastewater per day. The Hedon Road plant is the biggest, at between four and four and a half mgd.”

“Just household?”

He gave me a long look. “Of course.”

I nodded, trying to look satisfied. I just hoped that his reticence came from a feeling of superiority and not from ignorance. Household wastewater was anything but. It also included the runoff from storm drains. Which were prime sites for both deliberate dumping by waste-generating companies—large and small—and accidental spillage. Even if there was a spill in Dane Forest, forty miles from here, the contaminated water would find its way through underground aquifers to the city system. And those spills could be anything. Literally anything. I was glad that plants like these always had a large, specifically designed overcapacity. With people like Hepple in charge, we’d need it.

We climbed onto a catwalk over a hangarlike area where huge plastic troughs lined with gravel stretched into the distance. Bulrushes rocked and swayed in the water below. The air was snaky with aromatics and aliphatics. The workers below were not wearing masks but I said nothing. Sal Bird would not.

“This is the initial treatment phase where influent goes through simulated tidal marshes. The influent point itself is at the far end, housed in the concrete bunker.” He pointed, but then we got off the catwalk in the opposite direction and went through an access corridor. It was noticeably warmer. “We have eighty parallel treatment trains here, and an impressive record. The Water Authority mandates less than thirty parts per million total suspended solids; we average eight. The biological oxygen demand needs only be reduced to twelve ppm, but even with extremely polluted influent, our effluent rarely tests out at over seven.”

I had learned at age twelve, from my uncle Willem, that in a properly run plant the average BOD should never be higher than two ppm, but I didn’t say anything. Hepple hadn’t mentioned heavy metals or any of the volatile organic compounds, either, and I wondered what the plant’s record was like on those.

We walked among enormous translucent vats filled with swimming fish and floating duckweed. Pipes ran everywhere: transparent and opaque, plastic and metallic, finger-thin and bigger around than a human torso. I could feel the vibration of larger pipes running under our feet.

“The fish graze on this weed,” he said, “and if we have overgrowth we can harvest for animal feed. Further on we grow the lilies that are the real commercial backbone. But nothing, nothing at all, is wasted.” He came to an abrupt halt.

“According to your employment file you’ve worked at the Immingham Petroleum Refinery. What was your speciality?”

“Continuous emission monitoring,” I said, knowing full well that in this solar aquatics and bioremediation waste-water plant there was no such job.

“You’ll be assigned something suitable, of course, but whatever your role, the one thing to bear in mind is that this plant—the four and a half million gallons coming in, the thirty-five million gallons on the premises, and the four and a half million going out—is one giant homeostatic system.” He waited for me to nod. Probably wondered if I knew what homeostatic meant. “The more polluted the influent the more plants we grow and the more fish we harvest, but the effluent is always the same: clean, clean, clean. The only way this can be achieved is through attention to detail. As you’re used to a monitoring post, we might start you off in TOC analysis.”

I asked, because Sal Bird would have. “What’s TOC?”

“Total organic carbon analysis. Of the influent.”

At the initial stage, where none of the workers wore masks. One of the dirty jobs.

We stepped through what looked like an airlock into another closed corridor. Hepple fussed with the seals and we started walking again.