Next Article in Journal
Building a High-Precision 2D Hydrodynamic Flood Model Using UAV Photogrammetry and Sensor Network Monitoring
Next Article in Special Issue
The Zeolite-Anammox Treatment Process for Nitrogen Removal from Wastewater—A Review
Previous Article in Journal
Simulation of Infrastructure Options for Urban Water Management in Two Urban Catchments in Bogotá, Colombia
Previous Article in Special Issue
Removing Organic Matter and Nutrients from Swine Wastewater after Anaerobic–Aerobic Treatment
Article Menu
Issue 11 (November) cover image

Export Article

Open AccessArticle
Water 2017, 9(11), 860;

Decomposition Analysis of Water Treatment Technology Patents

Graduate School of Fisheries and Environmental Sciences, Nagasaki University, Nagasaki 852-8521, Japan
Urban Institute & Department of Urban and Environmental Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
Author to whom correspondence should be addressed.
Received: 25 August 2017 / Revised: 1 November 2017 / Accepted: 3 November 2017 / Published: 6 November 2017
(This article belongs to the Special Issue Recent Advances in Water Management: Saving, Treatment and Reuse)
Full-Text   |   PDF [987 KB, uploaded 6 November 2017]   |  


Water treatment technology development supports a steady, safe water supply. This study examines trends in water treatment technology innovations, using 227,365 patent granted data published from 1993 to 2016 as an indicator of changing research and development (R&D) priorities. To clarify changes in R&D priorities, we used a decomposition analysis framework that classified water treatment technologies into five types: conventional treatment (117,974 patents, 51.9%), biological treatment (40,300 patents, 17.7%), multistage treatment (45,732 patents, 20.1%), sludge treatment (15,237 patents, 6.7%), and other treatments (8122 patents, 3.6%). The results showed that the number of water treatment technology patents granted increased more than 700% from 1993 to 2016; in particular, the number of multistage water treatment patents granted rapidly grew. The main driver of this growth was expansion in the R&D activity scale and an increase in the priority of multistage water treatment technology in China. Additionally, the trends and priority changes in water treatment technology inventions varied by country and technology groups, which implied that an international policy framework for water treatment technology development should recognize that R&D priorities need to reflect the diverse characteristics of countries and technologies. View Full-Text
Keywords: decomposition analysis; global patent data; research and development strategy; water treatment technology decomposition analysis; global patent data; research and development strategy; water treatment technology

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

Supplementary material

Printed Edition Available!
A printed edition of this Special Issue is available here.

Share & Cite This Article

MDPI and ACS Style

Fujii, H.; Managi, S. Decomposition Analysis of Water Treatment Technology Patents. Water 2017, 9, 860.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Water EISSN 2073-4441 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top