50 person johkasou supplier in Bangladesh

Roptan is a 50 person johkasou supplier in Bangladesh for schools, clinics, offices and small apartment blocks. Send the building plan, its use and the outlet route: we source a unit from a verified seller, check how it was sized and deliver to site.

Verified sellers
Checked before it ships
Delivered by Roptan

Prefer to deal with suppliers yourself? Post it on the requirement board

Buying 50 person johkasou in Bangladesh

A 50 person johkasou is a buried treatment unit at the top of Japan's small standard range. At 200 litres and 40 g of BOD per person a day, it is designed for 10 m³ of wastewater and 2 kg of BOD daily. In Bangladesh it serves small apartment blocks, schools, clinics and offices with no sewer, sized from the building's use, not a headcount.

For a building this size, a 50 person johkasou supplier in Bangladesh must show how the persons were counted. Roptan sources from verified sellers, checks the sizing against your plan, confirms the structure papers and compares installed prices with the heavier civil work included. The seller or its installer sets and commissions the unit, and servicing is agreed before handover.

Kinds of 50 person johkasou

Units for apartment blocks

Japan's table typically sizes flats from total floor area, with limits per dwelling. Choose this size for a small block, and send the floor area of every flat.

Units for schools and colleges

Sized in Japan by occupancy limit, the pupils and staff a building holds, not by water use. Choose it for a school or college block with no sewer.

Units for offices and clinics

Typically sized by floor area, with a higher count where an office has kitchen equipment. Choose it for an office or clinic, and say whether there is a kitchen.

Nitrogen removal units

Certified in Japan to under 10 mg/L of BOD and of total nitrogen. Choose one where the outlet joins a canal, pond or khal that others use.

Larger certified processes

Above 50 persons, Japan moves to certified processes such as batch activated sludge or intermittent aeration. Choose one when your count passes 50, rather than stretching a small unit.

How to brief a 50 person johkasou supplier in Bangladesh

Every building use: Name each use: flats, classrooms, offices, a clinic, a canteen. Persons for each use are added, and a use missing from the table borrows a similar one.
Floor areas and occupancy: Give floor areas per use, and the occupancy limit for a school. Fractions are rounded up, and the table value may be adjusted where it misfits the real building.
Kitchen and fats: An office kitchen typically raises the count. Keep oils, fats and non-domestic wastewater out, and add pretreatment ahead of a heavy kitchen.
Base and ground: The tank sits on compacted rubble, 12 to 15 cm in the Japanese specification, then levelling concrete and a reinforced base plate that carries the tank and anything above it.
Groundwater: Give the highest monsoon level. High water means dewatering the pit and measures that stop the tank floating.
Blower supply: The supply the maker states, at 50 Hz, earthed and waterproof, with the blower on its own base and fed from the generator circuit.

Standards and rules for a 50 person johkasou

JIS A 3302: The Japanese Industrial Standard that turns building use into persons served. Ask which table rows the seller used, and to see the arithmetic for each use.
Johkasou Act (Japan): Japanese law on installation, upkeep and desludging. Its duties apply in Japan only; borrow them as the scope of your service contract in Bangladesh.
Water Pollution Control Act (Japan): In Japan, units serving 501 or more persons, or 201 in some prefectures, also fall under effluent regulation. A 50 person unit sits well below that band.
ECR 2023: Bangladesh's effluent discharge standards are in the Environment Conservation Rules 2023. Ask for the expected outlet BOD and TSS in writing and a lab test after start-up.

What moves the price of a 50 person johkasou

Persons served: the count from your plan sets the tank volume and the load.
Process: nitrogen removal or membrane designs usually cost more than standard units.
Civil work: the rubble bed, reinforced base plate and top slab grow with the tank.
Wet ground: dewatering and flotation measures in the monsoon.
Service: inspection at least every 3 months in the Japanese example, plus desludging.

Lead times and delivery

No standard figure applies. Time depends on whether the seller holds the model in Bangladesh or brings it in to order, on the base plate and top slab, and on groundwater during the dig. The outlet test waits until treatment settles. Roptan confirms dates, and any minimum, in the quote.

We deliver to site across Bangladesh. The seller or its installer builds the rubble bed, levelling concrete and reinforced base plate, dewaters where needed, sets the tank level and fills it with water before layered backfill. Pipes are connected, the top slab is cast, the blower goes on its own base and the unit is test run. Handover brings the documents, a manager's briefing and a VAT invoice (Mushak 6.3).

What we check for this order

Persons per useWe check the seller's count use by use against your plan, with fractions rounded up.
Size bandWe check whether the count stays within 50 persons or calls for a larger certified process.
Base plate designWe ask how the base plate carries the tank and anything above it before the dig starts.
Service interval in writingWe ask for the maker's inspection interval and desludging criteria in the service terms.

Questions buyers ask

How many pupils or staff does a 50 person unit serve?

Often more than 50 people, because Japan's table typically counts each pupil as a fraction of a person and sizes an office from its floor area. The seller should work from your occupancy limit or floor area, so send those rather than a headcount.

What if my building counts as more than 50 persons?

Choose a larger unit or certified process rather than overloading a small one. Above 50 persons, Japan's certified types include batch activated sludge and intermittent aeration. Ask what operator skill the next size needs.

How often is a 50 person johkasou inspected?

The maker sets the interval. Japan's example for contact aeration units of 21 to 50 persons is at least every 3 months, more often than a house unit. Desludging is yearly in Japan, or sooner if sludge storage fills.

Who runs the unit day to day?

Your building manager. Japan's rules put upkeep on the owner or person in charge, and the same split works here: the manager keeps the blower on and the lids clear, and a contractor inspects and desludges. Roptan arranges that contract through the seller.

How soon will I hear back about johkasou?

Within 48 hours of a complete requirement, with a price and a delivery date. A requirement is complete when it has the capacity, where it is needed and by when.

Who do I deal with?

With Roptan, when Roptan manages the order: we buy from the verified seller and deliver to you. With the supplier directly, when you post on the requirement board and choose a quote yourself.