A typical scenario (an illustrative situation based on common post-flood problems, not a review from any specific customer)

The smell of wet paper that made the library quieter than ever

Oat has volunteered at a small community library in Bueng Kum for almost ten years. The library takes up the ground floor of a two-storey community building: wooden shelves line three walls, there is a carpeted children's corner with floor cushions, a newspaper table where older neighbours sit every morning, and four computers that secondary students use for homework. Upstairs is the youth centre, with a music practice room, a dance room laid with rubber mats and a small meeting room used for evening tutoring.

In the last week of September 2026, heavy rain fell for days. According to news reports, roughly 300 mm of rain in about 48 hours flooded eastern Bangkok, and the Bangkok Metropolitan Administration declared all 50 districts a disaster zone on 26 September. Bueng Kum was among the areas mentioned in the news. Water came into the library to about knee height, covered the two lowest rows of every shelf and stayed for several days before slowly draining away.

On the first day back, Oat stood at the door longer than he expected. The picture books the children loved most had swollen until their covers curled. Old newspapers the community kept as a local archive had fused into solid blocks. The carpet in the children's corner had turned brown, and the smell drifting out was wet paper mixed with that damp, musty odour anyone who has opened an old storeroom recognises immediately.

Three days later, after volunteers had carried out the ruined books and washed the floor, greenish-grey spots began to appear on the spines of books on the third row, a row the water never reached, because humidity in the room had stayed high. Some of the older people who came by to ask when the library would reopen started coughing as they walked in, and the teenagers in the tutoring group kept asking about the upstairs meeting room they used every evening. Oat's question was simple: how do we make the library and youth centre a safe shared space again without losing even more of the books that can still be saved?

Libraries are natural homes for mold, and floods make them dangerous

Paper, binding glue, cloth covers, carpet, wood and dust are all excellent food for mold. Even in normal times libraries have to manage humidity. When a flood comes in, humidity jumps, and even books on upper shelves that never touched the water absorb moisture from the air until mold can grow within days. That is why public-health bodies such as the CDC and WHO advise cleaning and drying within 24 to 48 hours wherever possible to limit mold.

What hides in a library and youth centre after the water goes down

• Mold spores from books, carpets, cushions, wooden shelving and gypsum walls. Spores are tiny and stay airborne for a long time; every time someone walks past or pulls out a book, they rise into the air.
• Bacteria from wastewater trapped in carpet, dance-room rubber mats and every surface the water touched, especially where water from drains and canals entered the building.
• Respiratory and gut viruses passed through shared surfaces such as keyboards, computer mice, microphones in the music room and tutoring tables, once groups of children and teenagers start meeting again after a closure.
• Dust mites and fine dust that multiply in damp carpets and cushions and trigger allergies just as mold does.

Symptoms visitors may notice

People sensitive to mold may sneeze, have a blocked or runny nose, itchy eyes, a scratchy throat, a cough or a tight chest. People with asthma may have attacks in rooms with heavy spore loads, and some develop itchy rashes after handling moldy books or cushions. Volunteers who waded through water while carrying books out should think of leptospirosis if they develop a high fever, headache or calf pain, and see a doctor at once rather than waiting for it to pass.

Who is at risk in a space like this

A community library serves a wider mix of people than many realise: small children listening to stories on the carpet, students on the computers, teenagers breathing hard during dance practice, older people reading the papers every day, pregnant women bringing an older child to borrow books, and people with lung disease or weak immunity. All of them share the same air in rooms that often keep the air-conditioning on all day.

What the community loses if recovery is done the wrong way

Health

A library with lingering mold becomes a place where people cough every time they enter. Children with allergies may develop chronic symptoms while parents never connect them to the building. A dance room with damp, musty mats is where teenagers breathe most deeply of anywhere in the centre.

Collections and money

Most community libraries built their collections one donated book at a time over years. Mold spreading from damaged books to healthy ones is a loss that did not need to happen. Then there are carpets to replace, shelves to repair and computers to fix, usually on a very small community budget.

Time and activities

Each closed week means lost activities: Saturday story hour, exam tutoring and youth band practice. Volunteers, already few, have to clean again and again if mold returns soon after reopening.

Community trust

Parents decide based on the first visit after reopening. If a child comes home congested or says the room smelled bad, they may not come back, and a safe after-school space quietly disappears from the neighbourhood.

Families and young people

For many families nearby, the library and youth centre is where children get internet access for homework, where volunteer tutors help them, and where adults keep an eye on them while parents work. Restoring it safely looks after the whole soi.

Why common library fixes do not finish the job

Wiping spines and putting books back. Wiping visible mold off a spine does not remove spores between the pages. Returning damp books to shelves that are still damp lets mold spread to neighbouring volumes.

Using bleach on everything. Bleach is fine on washed tile floors but unsuitable for paper, cloth covers, carpet and wood, which it stains and damages. It also does nothing for the air or the space behind bookshelves.

Running the air-conditioning very cold. Air-conditioners remove some moisture, but if their own coils and filters were exposed to high humidity and have not been cleaned, they spread spores around the room.

Charcoal or moisture-absorber bags on shelves. These help a little in closed cabinets but cannot cope with a large room whose walls and floor still hold water.

Spraying air freshener. A nice scent makes people feel better briefly, but it does not reduce germs in the air and can hide the fact that the problem is still there.

A library needs work done in order: sort, dry, clean, and then reduce germs in the air and the corners hands cannot reach. That last step is where ozone comes in.

WHD ozone disinfection for libraries and youth centres

World Health Disinfection (WHD) provides residential and building ozone disinfection for homes, condominiums, offices, schools, hotels and shared buildings, including libraries, community centres and youth centres.

How it works

Ozone (O3) is a strongly oxidising gas. Released in a closed room at a controlled concentration, it travels with the air into the gap between bookshelves and walls, under reading tables, behind speaker cabinets in the music room and into air-conditioning vents. It breaks down the cell structures of viruses, bacteria and mold, as well as musty odour molecules, and then reverts to oxygen (O2), leaving no chemical residue on shelves or tables.

According to test results certified for the company, WHD's service has been tested by Thailand's Department of Medical Sciences and Intertek (UK), eliminating viruses, bacteria and mold by 99.99%.

What to understand before booking

Empty rooms only. No people, pets or plants may be in the area during treatment. Visitors, volunteers and staff leave the zone completely and return only after the rest and ventilation period the team specifies. Community buildings with several rooms should post notices on doors and announce the closure in community groups in advance.

Ozone does not repair flooded books. Soaked books must always be sorted and either dried or discarded first. Ozone reduces germs in the air and on surfaces once rooms and contents are dry; it does not restore swollen paper and does not replace cleaning.

Flag special items early. If the library holds rare documents, original photographs, musical instruments or electronics, mention them during the survey so you can agree together whether to move them out or how to arrange them.

Steps

1. Survey. The team checks the reading room, children's corner, computer room, book store, music room, dance room and meeting room, assesses humidity and mold spots, and divides the building into zones.
2. Preparation. Dry books are pulled slightly away from the wall, cabinets and drawers opened, cushions stood up, windows closed, air-conditioning switched off and each zone confirmed empty.
3. Ozone release and contact time. The generator runs at a level suited to the room size; a typical cycle is about 30 minutes per zone.
4. Rest and ventilation. The machine stops, ozone breaks down and windows are opened before anyone re-enters.
5. Handover. The team advises on keeping rooms dry, arranging books and monitoring damp spots after reopening.

Promotion: ozone jobs worth 15,000 baht or more receive a free medical-grade disinfectant spray, useful for keyboards, tables and door handles in daily care according to the label.

10 reasons community libraries and youth centres should use ozone before reopening

1. It slows mold spreading through the collection by reducing airborne spores that could land on healthy books on higher shelves.
2. It reaches behind bookshelves, the dampest spot in the room and one almost nobody wipes.
3. No water or liquid chemicals on paper. Ozone works as a gas and becomes oxygen, leaving no marks on books.
4. It treats rooms where people breathe hardest. The dance and music rooms are where teenagers take in the most air. See the ozone service
5. It cuts the musty smell of wet paper by breaking odour molecules rather than masking them.
6. It reduces germs on shared equipment such as tutoring tables, chairs and computer-room surfaces, alongside wiping with disinfectant.
7. It is backed by testing according to company-certified results from the Department of Medical Sciences and Intertek (UK).
8. About 30 minutes per zone, so it can be done on a closed day without long disruption. Book a site survey
9. It reassures the community. Committees can explain every step taken, making it easier for parents to bring children back.
10. It protects a collection built over years. Saving the books that survived costs less than replacing them. Request a quote

Before and after a complete recovery

Example case: a ground-floor library with a youth centre upstairs

Example case (an illustrative scenario explaining the order of work, not a real customer review)

Oat called a meeting of volunteers and the community committee and split the work into three teams. The first team handled the books, sorting them into three piles. Soaked books with wastewater through to the inner pages were photographed, listed and discarded. Partly damp books were stood open like fans in a shaded, breezy room. Dry books were moved upstairs temporarily. For the fused archive newspapers, Oat photographed every page that was still readable before deciding what to keep.

The second team looked after the building. They shovelled out mud, rolled up and discarded the children's carpet, washed the dance-room rubber mats and stood them up to dry, had an electrician check the ground-floor sockets before switching on, and booked an air-conditioning clean for every unit. Two swollen wooden shelves were removed; the sound ones were wiped down and dried with fans and a dehumidifier running continuously.

The third team handled communication: notices on the building and messages in the community LINE group explaining that the library would stay closed for another week so it could reopen safely.

Once the rooms were dry enough, the committee booked WHD to survey and treat in a single day, split into five zones: the main reading room, the computer room, the book store, the music and dance rooms, and the upstairs meeting room. Nobody was in the building during treatment. Potted plants outside the library door were carried further away, and the youth band's guitars were stored at a volunteer's house, as agreed during the survey.

After the rest and ventilation period, volunteers opened the windows, re-shelved books with a small gap from the wall and placed an inexpensive humidity meter in the reading room to check daily. The library reopened with a small sign listing each step that had been taken. The regular older readers came back to their newspapers, and the tutoring group returned to the meeting room the following week.

Recovery checklist for community libraries and youth centres

Volunteer safety

• Cut power to flooded floors, have an electrician check before use, and never touch plugs or switches while wet.
• Wear rubber gloves, boots and a mask when moving moldy books, because spores rise as you lift them.
• Cover all cuts. Anyone with fever or calf pain after wading should see a doctor.

Sorting books and media

• Photograph or list discarded books so you can request replacement donations.
• Discard books soaked in dirty water or swollen shut; they are very hard to clean and dry right through.
• Stand slightly damp books open in shade with airflow and turn the pages from time to time.
• Consult a conservation specialist for rare documents or community archives.

Before ozone day

• Remove mud, wash floors and dry rooms as much as possible.
• Discard carpets and foam cushions soaked in dirty water; wash and dry rubber mats.
• Clean air-conditioners and wash or replace filters.
• Move plants, pets and any agreed valuables out of the area.
• Tell the community the building will be closed on treatment day.

After ozone

• Enter only when the team confirms the rest and ventilation period is over.
• Shelve books with a small gap from the wall and not packed too tightly, so air can flow.
• Wipe keyboards, mice and tables with disinfectant regularly.
• Watch room humidity and new mold spots for at least a month.

For high-touch surfaces you can use Chemgene HLD4H medical-grade disinfectant at the dilution on its label. If new paint or shelving leaves chemical smells, see the ozone chemical-residue and odour removal service.

Frequently asked questions

1. Can ozone make flooded books usable again?

No. Books soaked in dirty water must be sorted and dried or discarded. Ozone reduces germs in the air and on surfaces once everything is dry, and lowers the chance of mold spreading to other books.

2. Do we have to remove every book before treatment?

Generally, dry books can stay on the shelves during treatment. For rare documents, original photographs and specialist valuables, discuss with the team during the survey whether they should be moved out.

3. Can volunteers stay upstairs while only the ground floor is treated?

The team assesses how well areas are separated on survey day. The key rule is that the zone being treated must be empty, and you should avoid staying in the same building if air can move between floors. The safest option is for everyone to leave the building on treatment day.

4. How long does it take?

A typical cycle is about 30 minutes per zone, excluding preparation and airing. A centre with five zones can often be finished in one day, depending on size.

5. Will mold never come back after treatment?

If the source of moisture remains, mold can return. Ozone reduces the germs present at the time; long-term prevention depends on humidity control, ventilation and regular cleaning.

6. What if someone coughs or struggles to breathe after reopening?

Ask them to leave the area and see a doctor if symptoms do not improve, especially people with asthma or lung disease, and check the room again for remaining damp or mold. Ozone treatment is not medical treatment.

A shared space the neighbourhood is waiting for

According to news reports, the Bangkok governor said the canals were full and drainage would take two to three days after the rain stopped, and as of 30 September some roads such as Si Burapha and Lat Phrao still had 20 to 40 cm of water. Thai media compared the event with the 2011 floods, and one business report cited a Chamber of Commerce estimate of about 12,300 million baht in damage. Recovery will take time, and shared spaces such as libraries and youth centres are often last on the list.

Yet for a child whose home is still damp, with no desk and no internet, the community library may be the only place to get back to normal study. Restoring it safely, and reopening it properly, pays back to the whole neighbourhood.

Let your community library and youth centre breathe again

Talk to WHD to survey the building, set zones and plan ozone disinfection on a closed day, always in empty rooms with no people, pets or plants inside, plus advice on keeping damp under control after reopening.

See the Ozone Disinfection Service

Call 065-556-6294  |  LINE @whd268  |  worldhealthdisinfection@gmail.com

Related pages

• Residential and building ozone disinfection
• Ozone odour and chemical-residue removal
• Chemgene HLD4H medical-grade disinfectant

References

• Wikipedia: 2026 Bangkok floods
• Al Jazeera: Disaster zone declared across Bangkok as heavy rain triggers flooding
• CDC: Floods and clean-up guidance
• WHO fact sheets