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Vacuum Toilet and Portable Restroom Manufacturer

We design and manufacture vacuum toilet and portable restroom

About Us


Sichuan Zhongneng Environmental Protection Technology Co., Ltd. is a high-tech enterprise focusing on scientific research, design, production, installation and technical services of "vacuum toilets". With mature technology and rich design and construction experience, ZNZK has always been at the forefront of research of China's vacuum toilet system products.

ZNZK has gone on to the largest supplier of vacuum toilet in China. With 500+ installations nationally, ZNZK design engineers and project managers have been involved in a large variety of projects of different environmental and engineering challenges. Our extensive experience is not limited to design, troubleshooting and maintenance of systems. We are always there for you from the beginning to the end, from design to operation .

ZNZK follows ISO9001 and ISO14001. ZNZK provides professional training programs for customers purchasing and installing vacuum toilet systems, as well as periodic inspections during installation and excellent after-sale service.

We Provide

Our strength

System design

Manufacturing: 25 working dates

Global shipping: by container




Spare parts

System update

Our vacuum toilet system

can solve these problems you meet

Easy to be frozen

Solution-Because the vacuum environment-friendly toilet sucks the dirt through the air pressure, the solid sewage pipe can reach the "no water" state, additional, secondary insulation subject to the water inlet pipe and the sewage pipe ,which completely ensure that the toilet is in a cold (-40℃ ) environment can normal work.

No water inflow

Solution-There is a small water storage tank of 1.5 m3 in the system, and the water consumption of the vacuum environment-friendly toilet is less than 0.5L/time, it can be used for 3000-4000 times.

No sewage

As the vacuum environment-friendly toilet use less water and has relatively less solid waste, there is no need to design a large-scale fecal pond to collect the waste. A small 3m3 waste tank can be installed in the room, which can meet 3000-4000 times of use.

Lack of water or difficult to clean

Solution-Intelligent remotely real-time control the internal water supply system and sewage collection system of each toilet. When the water supply is insufficient or the sewage tank is about to overflow, the system will automatically alarm. For areas where the public toilets are too scattered, it is convenient for toilet management.

Need to be moved frequently

Solution-As the vacuum toilet system equipment is integrated with the room body, the toilet is highly mobile and easy to carry

Need installed place have a slope

Solution-As vacuum toilets use negative pressure to be power source. The pipeline installation process can follow the structure's exterior, interior linear, curved, and even upward and downward directions. It is truly realize to “the water flows upward"

Factory Tour

Our Company
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  • factory (2)
  • factory (1)
  • Ctrol-system-1

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