Increasing demands of comfortable living conditions and healthy global environment have been giving more pressures to the wastewater treatment technology. Maezawa has been improving wastewater treatment technologies through all experiences in the field over 50 long years. We have been aggressively cooperating with technology leaders outside of Japan, while taking every public requirement as ours to continue the accumulation of new technology.


The wastewater treatment system is one of the most featured technologies of Maezawa, based on user-friendly technology, in which local conditions, treatment quantity, economic efficiency and environmental standard such as BOD, SS and COD are fully reflected.

Automatic Screen

Pin-Rack Screen Unit

The Pin-Rack Screen Unit is designed for easy operation and maintenance as well as to reduce lead times for construction. Based on long-time practical experience in designing and manufacturing of equipment for sedimentation basin, Pin-Rack Screen Unit from Maezawa can respond to the increasing demand of equipment renewal in many respects.



Easy installation and Maintenance

Simple structure with few components

Metal parts protection

Chain Type Screen Unit

Chain type screen unit is ideal for combined sewers. With minimal components, it surpasses continuous belt secreens in durability, even in high-sand condition. Our innovative foreign object avoiding mechanism proactively prevents damage, making it resilient against substantial sand or large foreign objects.



Protective with foreign object avoiding mechanism

Easy maintenance and installation

Simple structure with few components

➤ Protective

      with foreign object avoiding mechanism

The conventional chain type screen may breakdown if large foreign objects get trapped,    as the fixed rake can experience excessive load.   Our Foreign Avoidance Mechanism prevents this issue by allowing the rake to dissengage from the chain's path when overloaded, then returning to its path once the obstruction passes. 

➤ Easy Installation




Delivered as pre-assembled unit with all necessary components.

- Eliminates the time

- Cost saving

- Avoiding unexpected assembly failures

➤ Easy Maintenance

Lubrication is designed to only two points with Auto-Greasing Units (A) for the drive bearings.  The absence of sprockets and bearings in the underwater section, lubrication at the channel bottom (B) is unnecessary.

Oxidation Ditch (OD) nitrogen removal system by dual Dissolved Oxygen (DO) control

Dual DO control for OD system enables efficient and stable nitrogen removal by controlling aeration and water circulation independently, and producing optimal aerobic and anoxic zones.




Low power consumption
Efficient and stable nitrogen removal 

MBR System using PTFE Hollow Fiber Membrane

MBR (Membrane BioReactor) produces highly purified water with smaller foot prints. PTFE hollow fiber with high mechanical strength and chemical resistance enables a longer period of stable operation and higher durability for heavy duty operation than membranes made of other types of resins.


LANDOX OD System is a new Oxidation Ditch system composed of LANDOX - high efficiency flow booster and the fine bubble air diffuser. It is a suitable solution for renewal of an aeration system using vertical drum mixers, which especially leads to energy saving and improvement of nutrient removal. The system also accommodates deep ditch (Approx. 5m depth) where efficient propulsion of the mixed liquor is required.

Multi Mesh Screen (MMS)

MMS is a unique screen that removes fine debris by circulating mesh panels that are connected to revolving chain at their rear side. These basis and structure lead to higher removal rate of fine debris and maintainability than conventional automatic screens.