Uniquely Developed by Kendensha, 'Clog-free' Solid-liquid Separator Multi-disc Roller Separator
KDS Separator
( a.k.a., SLIT SAVER ) Multi-disc Roller Separator
KDS Separator

( a.k.a., SLIT SAVER )

KDS Separator Patented Product (Japan, USA)
The number of units sold : 1300 units (March, 2024)


Trouble-free and Stable Processing

Kendensha's unique 'self-cleaning' mechanism prevents clogging on the screen, so backwash is not required. Treatment capacity reduction due to clogging does not occur. In short, automatic, continuous and stable operation is possible.

By combining with our Polymer Preparation System, KDS dewatering system achieves 24/7, unattended operation of sludge dewatering.

Hybrid Model - combines two functions

- Solid-liquid Separation / Fine Screening

A solid-liquid separator is used for various purposes, such as industrial wastewater/livestock wastewater treatment, residue removal from industrial wastewater and sludge thickening. One of the problems that conventional machines have is that their screens get clogged quite easily. Cost and labour are required to remove the clogging.

We developed the cutting-edge mechanism with a unique self-cleaning function. The screen does not clog without backwash. KDS separator enables reduction in installation cost, life-cycle cost and operation cost. Besides, the footprint is much smaller than other devices with equivalent performance.

- Sludge Dewatering

KDS separator works as an efficient and effective sludge dewatering device, as well. The original pressurization mechanism reduces water content and the volume of discharge cake. Furthermore, the discharged sludge cake has been composted or utilised as cement raw material. This contributes to 3R(Reduce, Reuse, Recycle).

Features and Advantages

Small Footprint - 1/3 of conventional devices

KDS separator does not require a wide space and its noise and vibration is very little. Therefore, it is possible to design and install in a client's existing space.

Cost Effectiveness

Low power consumption

Our unique oval-plate units rotate slowly (12-16 revolutions per minute).
Therefore, KDS separator operates on low power.

Compared to decanter centrifuges, power consumption is approximately 1/15. (KDS Separator : treatment capacity 40kgDS/hr model)

Power Consumption Comparison

No need for washing during operation

Because our 'self-cleaning' mechanism prevents clogging, backwashing is not required during operation.
Rinsing is needed after operation only.

In comparison to belt press type dehydrators with equivalent treatment capacity, washing water usage is 1/45.

Water Usage Comparison

Applicable for a wide variety of sludge properties. Easily adjustable!

Variations in sludge properties are accommodated by adjusting the rotational speed of the oval-plate units and the pressure of the pressure plate. Complex adjustments are not required.

For example, if your priority is treatment capacity, increase the rotational speed of the oval-plates and reduce the pressure of the plate to improve it.
On the contrary, if you want high dryness of discharge cake, you can reduce the water content by slowing down the oval-plate units' rotation and increasing the pressure of the plate.

When the sludge properties are such that pressurisation causes a huge amount of solids to leak into the filtrate (e.g. containing quite an amount of oil), the clarity of the filtrate can be improved by reducing the pressure of the plate.


  • Livestock Wastewater
    e.g. manure dewatering, waste activated sludge dewatering, impurity removal, etc.
  • Industrial Wastewater
    e.g. waste activated sludge dewatering, DAF (dissolved air flotation) sludge dewatering, anaerobically digested sludge dewatering at food processing plant, seafood processing plant, etc. treatment of water paint wastewater, etc.
  • Municipal Wastewater
    e.g. thickening and dewatering of initial sedimentation sludge, oxidation ditch system sludge, excrement, waste activated sludge, anaerobically digested sludge at sewage, night-soil treatment facilities, etc.

Customer Support

Kendensha devices’ consumable parts are replaced by exchanging a whole module. This makes quick restoration possible. By standardising consumable parts, the supply has been stabilised and the cost of maintenance is reduced.

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6 Reasons to Choose Kendensha


In-house Integrated Manufacturing and Sales

Kendensha integrates marketing, designing, manufacturing of wastewater/sludge treatment equipment. This made us utilize PDCA possible and establish a system which enables stable supply of high quality products.

Well-Suited Proposals

Based on 60 years of experience, we suggest the best flocculant, device and solution to perfectly meet your requirements.

Designing Flexibility

Our specialized staff, who possess extensive knowledge and experience, have detailed meetings and design customized devices/systems for each client.

Delivery and Parts Supply

In-house integrated production and efficient supply chain enables flexible delivery and parts supply.

Customer Support

A substantial stock of spare parts is always available. In case of troubles, we promptly dispatch necessary parts.

Environmental Friendly Designing

We design reduced power consumption, life-cycle cost, operation cost and space saving devices/systems that meet a wide variety of demands. Together with clients, we contribute to building a sustainable society.

Customer Testimonials

Livestock farming, food processing, manufacturing industry…
Kendensha's products are working in various sectors!

We would like to share messages from our clients.

Swing Engineering Corporationexternal link


Our business partnership with Kendensha has started from when we adopted KDS Separator as a primary treatment device for our dewatering system. Since then, more than 100 KDS Separators have been installed with our dehydrators for sludge recycling in sewerage and plant wastewater fields. They are indispensable for our sludge treatment system now.
Besides, Kendensha not only supplies excellent products but also has technical capabilities and agility to meet our demands. We, therefore, trust them as our most important partner for research and development as well.

TOMUSOexternal link


The problems of widely used dewatering devices or solid-liquid separators today are that significant decline of the treatment capacity due to filter clogging, and we have to spend a lot of effort and money for inside cleaning. To make matters worse, the water that was used for the cleaning itself needs to be treated and that costs us as well. Since KDS separator solves all these problems, we can suggest our clients a better solution which reduces and simplifies maintenance and management, lowers running costs, and even lowers initial costs by comparison with equivalent products. Therefore, KDS Separator has become one of our main products for both new and existing clients who are replacing their devices.
Kendensha's after-sale maintenance is precise and flexible. Their specialised staff, such as electricity, service mechanics, designing people deal with it. We trust them as our business partner. We will do our best to grow with Kendensha, which is outstanding in manufacturing and human resource development.

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