Chapter 16 — The City Has No Smell

Valve No. 3 jammed at 7:48 p.m., right at the time Reed River was about to show a clean city video on the riverside screen. It doesn't get stuck in the fully closed position. It gets stuck in between the two beats, causing the auxiliary pump to continue pushing solution into the spray line while the flow sensor sends back a valid value.

Tung was in the control room when the indicator light turned yellow. He looked at the chart, then heard a vibration on the floor. The system automatically suggests increasing power to compensate for fluctuations. His finger stopped on the confirmation button.

“No increase,” he said.

Loc looked at the screen. “If it doesn't increase, the odor area will return.”

“If increased, nozzle number three could overdose.”

“Just a yellow alert.”

“Gold is to make the reader stop.”

Tung switched the system to manual mode. The machine responds slowly, the valve does not return to position. A small warning appears in the corner: “Actual distribution cannot be confirmed.” He called Man, but the group leader was on the riverside stage with the media group.

Tung called Quynh.

"Station 3 cannot confirm distribution. I suggest stopping the injection cluster and opening the bypass line."

“If stopped, the smell from the tank area could go to Nam Ben.”

“If we keep it, we don't know how much we're spraying.”

“Give me five minutes.”

“Not five minutes.”

Quynh looked at the center screen. The Nam Ben area system is still green because of low odor sensors. Minute data from the handwritten group is being sent back: people in the dormitory began to report dry throats, a maintenance worker reported a headache, An texted Van that her neck and chest were heavy.

Quynh asked Huyen to go to the control room. Huyen is at the cultural house, next to Nghi and Van preparing for the meeting. She heard the words "valve stuck" and ran over, not calling it a disaster. Tung sent the coordinates, Huyen asked Van to open a medical channel and An stayed in the house with her father.

On the riverside screen, the video began to play. A voice says that Reed River has entered an era without bad odors. Meanwhile, at station 3, white mist sprayed low onto the market roof, held back by the wind. The water treatment area could not spray enough, so the sewer odor layer began to flow along the old path. Two layers of gas overlap: one attenuated, one untreated.

Huyen arrived at the control room at 20:02. Tung showed her the chart.

"The valve is not closing. The auxiliary pump is pushing. If the main power is turned off, the pressure line may backfire."

“Where is the bypass?”

“Under the station floor, you have to open it manually.”

“Can it be controlled remotely?”

"Are not."

Quynh walked in, still wearing the shirt from the media session. She looked at the video playing on the secondary screen, then turned it off.

“Activate the regional process,” she said.

Tung asked: “Turn off Clean Layer?”

"Reduce cluster number 3, keep other clusters at ground level. Inform people to limit going out and close the door towards the embankment. Clearly state that there is a technical error that is being handled."

“If you say it's an error, the city will panic.”

Quynh turned to Huyen. “How do you want to announce it?”

Huyen looked at the data: there was no specific substance, there was a stuck valve, there was a gas peak, and the symptoms were increasing. She said: "The South Ben area is having unstable air conditions due to an operating problem. People should stay indoors, close the door on the embankment, do not remove protection in the industrial park, people with respiratory diseases prepare medicine. Update after fifteen minutes."

“Don't mention the smell?” Quynh asked.

“Even the smell can come back, but don't use smell as the sole safety criterion.”

Quynh read the notice again, then signed it.

Tung called the maintenance team. Loc went to get the supplies tool, two other people checked the power lines. They had to go down to the technical floor below the station, where the concrete floor was wet and the pump vibrated in their stomachs. Tung gave each person a personal measuring device and a mask, asking them not to go alone.

Huyen wanted to follow, but Tung stopped him.

“You're not a maintenance person.”

“I need to know the actual conditions.”

"You need to live to read the data. Stand in the control room."

“You just said it like Ha.”

“Ha is right.”

Tung and Loc went down the stairs. The jammed valve is downstairs, right behind the mixer. They don't have a discernible smell, just a heavy feeling in the mask. A red light on the personal computer flashed and then turned green again. Loc asked if he should believe it.

“Believe it to know what it's recording,” Tung replied. “Do not believe to abandon the process.”

At the cultural house, Ha and Van organized a door-calling group. Nghi gave a list of stalls with elderly people. An led his father to close the door towards the embankment, but still texted the map every ten minutes. You don't go out. He used three colors: closed door, person to call, place with no response.

Huyen looked at his map through the video. “Do you have symptoms?”

“Breast heaviness 3 out of 10. No need for rescue medication yet.”

"Don't watch by yourself. Tell Dad to stay by your side."

“Dad is fixing the radio.”

“Then tell dad to fix it next to you.”

An burst out laughing briefly. Huyen heard his father pull out a chair.

On the technical floor, Tung discovered a small cracked filter. It doesn't cause the entire problem, but causes pressure fluctuations and prevents the valve from receiving the command to close. He reported it. Quynh asked if opening the bypass would make the sewer smell come back immediately.

“Maybe. But we need to control the path.”

“Can you open it?”

“If you open it slowly.”

"How long?"

“Two minutes to open, ten minutes to settle.”

Quynh sent the order through the public channel, publicizing the estimated time. Huyen announced an update: "The system is reducing spraying at station 3 to treat the valve. Odors may become more noticeable in the short term. A clear smell does not mean more dangerous in all cases; follow the location and symptom instructions."

Some people responded that the announcement was too complicated. Ha cut it into three specific things and left the explanation below. People need to know in advance which doors to close, where to go, and who to call.

Tung opens bypass. A loud crash echoed through the floor, then the pipe vibrated. The smell of sewer pervaded the technical floor, so clearly that Loc was nauseous. He wanted to take off the mask to breathe, but Tung held his shoulder.

“Do not remove.”

“I don't see the red machine.”

“A mask doesn't need a red machine to be useful.”

They opened each section. Pressure drops. Auxiliary pump stops. Valve number 3 finally returns to the closed position. The mist outside the station gradually thinned, and the smell of the processing area became clearer as the wind escaped towards the river. Tung reported that it was under control, but had not yet identified the substance in the low gas phase.

After listening, Quynh asked to keep the warning for another thirty minutes. A person from the city called to ask why spraying had not been restored. She replied: "Because the actual distribution has not been confirmed."

“But the odor index is increasing.”

“Yes. And the people have been informed.”

“What if the city loses its title?”

Quynh looked at Huyen. “Titles do not stand below station.”

After an hour, the wind changed slightly. The smell of sewer drifts to the river, making it easier for residents to complain about their throats. Two people went to the medical station because of difficulty breathing, no one had to be hospitalized. Van clearly noted this, along with the number of people without symptoms.

When Tung got off the technical floor, the mask had a layer of moisture. He placed the cracked filter in the sample bag.

“Do you smell it?” Huyen asked.

“Yes. But it didn't help me know at the time what to do. Process helps.”

“So the smell doesn't need to be removed.”

"Are not. It needs to stand in the right place.”

Quynh walked over and looked at the van that had stopped. She requested to seal the station and stop the automatic mode throughout the area until the inspection was completed. A media employee asked if the broadcasted clean city video should be deleted.

“Do not delete,” Quynh said. “Place the time and clearly state after which the operational problem occurred. People need to see both.”

Huyen gave the interim report for her to sign. It includes the following sections: what is known, what is not known, actions taken, impact recorded, and reasons not to use odor index as the sole criterion.

Quynh signed. Tung signed the technical part. Van signed the medical part. Comment on the method section. No signature makes the problem go away, but each puts responsibility in an auditable place.

That night, Reed River was no longer called the odorless city on the riverside screen. The text was still there because no one had time to remove it, but underneath, a new message appeared clearly: “The smell returned during a troubleshooting period. Please follow safety instructions.”

An texted Huyen: "The first time I saw the city, I said the smell might come back."

Huyen replied: "The first time the city had to speak quickly."

Valve number 3 is locked. But the incident opened a bigger door: if the returning smell was a warning, the city had to learn not to panic when it heard it, and not to fall asleep when it didn't.

In the following days, Huyen had to answer dozens of calls. Someone asked if the return of the sewer smell means the source of waste has increased. She said she wasn't sure. Someone asked if no smell means the station has sprayed enough. She said no. One person asked if everything is "uncertain" then what can people do? Huyen reads three steps by region, not the whole long report.

Tung and the maintenance team set up an incident board located right outside station 3. The board records stuck valves, stopped pumps, waiting spare parts, no-spray areas, and complaint phone numbers. A communications officer wanted to remove the "spare parts waiting" line because it made the system look weak. Tung said people need to know why the station is not operating yet.

Quynh requested that all calls be classified and not lumped into one general complaint. Nghi helps distinguish the smell of mud, oil, and detergent. Van marks the symptoms. An draws direction. Some calls do not create any problems, but they indicate where the message has not arrived.

On the weekend night, Huyen met Tu at the cultural house. He placed the empty vial of air next to a new notice. Both objects have no odor.

“Do you believe it more now?” Tu asked.

“No. I know better how to use it.”

"Different."

“Very different.”

Out on the street, the smell from the riverbank drifted in and then went away. Huyen does not close the door for anyone else. She just checked the update panel, making sure the icon still had an expiration date. A city cannot reassure everyone all the time. It can help them know what's going on, what's unknown, and what the next steps are.