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Johkasou Series
Integrated Wastewater Treatment Solutions for Decentralized, Domestic and Industrial Applications
Johkasou Series Sewage Treatment Systems
The Johkasou series covers Mejec's buried, decentralized sewage treatment units — complete treatment systems prefabricated for on-site installation close to the wastewater source. The series includes two product lines: Johkasou-SA, small-capacity buried Johkasou units sized from 1 to 5 m³/d for houses, villas, guesthouses, homestays and other small facilities; and Johkasou-SB, large-capacity integrated sewage treatment plants from 20 to 100 m³/d for residential communities, schools, resorts and hotels, public facilities, highway service areas, rural communities and commercial facilities.
Small Capacity Johkasou Sewage Treatment Plants
Small-capacity buried Johkasou systems provide a compact solution for decentralized domestic sewage treatment. Their buried installation concept helps reduce the visual impact of treatment equipment while making efficient use of limited site space.
Typical applications:
Rural areas
Villas
Homestays
Scenic areas
Small commercial facilities
Decentralized residential developments
Large Capacity Integrated Sewage Treatment Plants
For larger decentralized projects, integrated sewage treatment plants provide a more scalable solution for communities and facilities with higher wastewater flows. System configuration can be adapted to project capacity, site conditions and required treatment performance.
Typical applications:
Residential communities
Schools
Resorts and hotels
Public facilities
Highway service areas
Rural communities
Commercial facilities
Not sure which treatment system fits your project? Tell us your wastewater source, daily flow and discharge requirement — we will recommend a suitable configuration and quotation within 24 hours.
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What Is a Johkasou Sewage Treatment System?
A Johkasou system is a decentralized sewage treatment unit designed to treat domestic wastewater on site, close to the source. Major treatment components — biological stage, clarification and disinfection — are integrated into a compact, prefabricated tank that is normally installed underground at the property.
Compared with conventional site-built treatment facilities, Johkasou systems reduce the amount of on-site construction required, make efficient use of limited site space, and suit locations where connection to a centralized municipal sewer network is unavailable, impractical or uneconomical.
Johkasou sewage treatment units are a suitable choice for projects where:
✓ A centralized sewer connection is unavailable
✓ Buried installation is preferred
✓ Available land is limited
✓ Visual impact should stay low
✓ Required capacity ranges from 1 to 100 m³/d
✓ A packaged, on-site unit is preferred
Why Choose Mejec Johkasou Systems?
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Compact Buried System Design
Each Johkasou unit integrates its biological stage, clarification and disinfection into one compact buried tank, so the surface above stays usable while noise and odour are isolated below ground. -
Capacity from 1 to 100 m³/d
The Johkasou-SA line covers 1–5 m³/d for houses and small facilities, while Johkasou-SB systems from 20–100 m³/d scale up to communities, schools and commercial projects. -
Reliable Biological Treatment
Johkasou-SA units use MBBR with clarification and disinfection; Johkasou-SB systems combine AAO with MBBR for stable removal of organic pollutants, suspended solids and nutrients. -
Buried Installation Flexibility
Systems are prefabricated and delivered ready to install below ground, keeping visible equipment out of the way and simplifying projects where land or site appearance matters. -
Application-Oriented Selection
From a single villa or homestay to residential communities, schools, hotels and rural settlements, the suitable Johkasou configuration is selected according to daily flow, site conditions and the required discharge standard. -
Project Support
From equipment selection and system configuration to manufacturing and delivery, Mejec supports customers in developing sewage treatment solutions suited to specific project requirements.
Wholesale, OEM & Distributor Partnerships
Mejec partners with distributors, EPC contractors, engineering companies, and project developers worldwide to deliver reliable decentralized wastewater treatment to new markets. As the original manufacturer, we offer factory-direct pricing, flexible MOQs, and full OEM/ODM customization — including private labeling, custom capacity and process design (MBBR / AAO + MBBR), buried tank options, and control systems configured to your local discharge standards.
Our production facility supports everything from single-unit pilot projects to multi-container plant deliveries (20'GP / 40'HQ / flat rack), backed by [CE / ISO 9001 / ISO 14001 / SGS] and a dedicated export team handling documentation, logistics, installation guidance, and after-sales support.
Tell us your target market, daily treatment capacity, and influent/effluent requirements, and we'll provide a detailed wholesale quotation.
Frequently Asked Questions
What is a Johkasou system?
A Johkasou system is a decentralized sewage treatment unit designed to provide on-site treatment close to the wastewater source. The whole treatment process is integrated into one compact, prefabricated tank, normally installed underground, so it suits residential and small-scale facilities where centralized sewer infrastructure is unavailable.
What is the difference between Johkasou-SA and Johkasou-SB?
Johkasou-SA is the small-capacity line: buried units sized from 1 to 5 m³/d for houses, villas, guesthouses and other small facilities. Johkasou-SB is the large-capacity line: integrated sewage treatment plants from 20 to 100 m³/d based on the AAO + MBBR process for communities, schools, hotels and commercial projects.
What capacity range does the Mejec Johkasou series cover?
The Johkasou series covers decentralized sewage treatment from about 1 m³/d up to 100 m³/d. Small-capacity Johkasou-SA units are sized 1–5 m³/d, and Johkasou-SB integrated plants are available from 20 to 100 m³/d.
Can a Johkasou system be installed underground?
Yes. Johkasou units are designed for buried installation. The surface above can be planted, paved or used as a garden, terrace or walkway, and the sealed underground environment isolates noise and odour.
What type of sewage treatment plant is suitable for a house?
For individual homes, villas and other small residential applications, a small-capacity Johkasou-SA unit may be suitable. The appropriate model depends on daily wastewater flow, installation conditions and the required effluent standard.
Which projects use large-capacity Johkasou systems?
Johkasou-SB integrated plants are suited to residential communities, schools, resorts and hotels, public facilities, highway service areas, rural communities and commercial facilities with higher daily wastewater flows.
What wastewater treatment plant is suitable for rural areas?
Rural areas often benefit from decentralized sewage treatment systems because centralized sewer networks may not be available. Household systems, Johkasou-SA units, Johkasou-SB integrated plants and containerized wastewater treatment plants can all be considered depending on project scale.
Do you offer OEM/private label wastewater treatment systems?
Yes. We support full OEM and ODM customization, including branding, container color and layout, control panel design, process configuration, and technical specifications tailored to your market and local discharge standards.
Can the treatment capacity be customized for my project?
Yes. Our systems are designed to order — from small buried Johkasou units for households to containerized plants of several hundred m³/day and above. Send us your daily flow, water quality data, and effluent target, and our engineers will propose a matching process design.
What is your minimum order quantity (MOQ)?
MOQ is one unit — a single Johkasou system for a pilot project is quoted on the same terms as a container load. Lead time is 15 days, quotes are returned within 24 hours, and units are CE and ISO certified.
Do you ship by container?
Yes. Containerized systems ship as complete units, and other equipment is loaded into 20'GP and 40'HQ containers or flat racks. Our export team handles the full shipping documentation process worldwide.
Do you provide installation and after-sales support?
Yes. Systems arrive pre-assembled and pre-tested to minimize on-site work, and we provide installation drawings, commissioning guidance, remote technical support, and spare parts supply throughout the equipment's service life.
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