Regional spotlight: Desalination & advanced water treatment in China — what's different and why it matters

China operates the world's largest portfolio of desalination and advanced water treatment infrastructure outside the Middle East, yet its approach to solving water scarcity diverges sharply from the Gulf state model that dominates global narratives. While Saudi Arabia and the UAE rely on thermal desalination powered by abundant fossil fuel reserves, China has built its water security strategy around membrane-based technologies integrated with renewable energy, industrial wastewater recycling, and centralized state planning that compresses deployment timelines from decades to years. Understanding these differences is essential for founders, investors, and policymakers evaluating opportunities in the $28 billion global desalination market.

Why It Matters

China faces a structural water crisis that no amount of conservation alone can resolve. The country holds 20% of the world's population but only 7% of its freshwater resources, and the geographic distribution is severely unbalanced. Northern China, home to roughly 40% of the population and 65% of agricultural land, receives less than 20% of the country's precipitation. The Huang-Huai-Hai plain, which produces over 60% of China's wheat and 35% of its maize, depends on groundwater aquifers that have declined by 1 to 3 meters per year over the past two decades.

The Chinese government's 14th Five-Year Plan for the National Economy (2021 to 2025) designated desalination and advanced water treatment as strategic industries, targeting installed desalination capacity of 2.9 million cubic meters per day by 2025, up from 1.65 million cubic meters per day in 2020. The 15th Five-Year Plan, released in draft form in late 2025, escalates this target to 5.5 million cubic meters per day by 2030. These targets represent growth rates of 15 to 20% annually, compared to the global average of 7 to 9%.

For founders, China's water treatment market presents a paradox: enormous demand combined with regulatory complexity and a competitive landscape dominated by state-owned enterprises. Foreign companies that have succeeded in this market have done so by offering technologies that domestic players cannot yet replicate, particularly in membrane manufacturing, energy recovery devices, and advanced oxidation processes.

Key Concepts

Reverse Osmosis Membrane Technology dominates China's new desalination capacity, accounting for over 80% of installations since 2018. Chinese manufacturers including BEWG, OriginWater, and Suntar have achieved cost parity with imported membranes from Toray, DuPont, and LG Chem for standard brackish water applications. However, high-performance seawater membranes with salt rejection rates above 99.8% and boron rejection above 95% remain largely imported. The domestic membrane industry benefits from extensive government subsidies through the National Key R&D Program, which allocated approximately $450 million to membrane research between 2021 and 2025.

Industrial Water Recycling represents a fundamentally different approach from the Middle Eastern model. While Gulf states treat seawater primarily for municipal supply, China's regulatory framework mandates water recycling rates of 90% or higher for new industrial facilities in water-scarce regions. The Ministry of Ecology and Environment's 2023 Industrial Water Efficiency Standards require steel plants to achieve water recycling rates of 98%, power plants 97%, and petrochemical facilities 95%. These mandates create a massive market for advanced treatment technologies including membrane bioreactors, zero liquid discharge systems, and electrochemical oxidation.

Renewable-Powered Desalination has become a policy priority following the 2024 revision to China's Desalination Industry Development Action Plan. The revised plan requires all new coastal desalination plants with capacity exceeding 10,000 cubic meters per day to source at least 30% of electricity from renewable sources by 2027, rising to 50% by 2030. This requirement has driven integration of offshore wind and solar photovoltaic systems with desalination infrastructure, particularly in Shandong and Zhejiang provinces where both wind resources and water demand concentrate.

South-to-North Water Transfer Project provides essential context for understanding China's desalination strategy. This $80 billion infrastructure program, the world's largest water transfer scheme, diverts water from the Yangtze River basin to northern China through three canal routes spanning over 4,300 kilometers. The project delivers approximately 25 billion cubic meters annually but has reached practical capacity limits. Desalination and advanced treatment are increasingly positioned as complements to, rather than replacements for, inter-basin transfers.

Desalination and Water Treatment KPIs: China vs. Global Benchmarks

Metric	Global Average	China Average	China Top Quartile	Gulf States
Seawater RO Energy Consumption (kWh/m3)	3.5-4.5	3.8-4.2	3.0-3.5	4.0-5.5
Installed Cost ($/m3/day capacity)	$1,200-1,800	$800-1,200	$600-900	$1,500-2,500
Membrane Replacement Cycle (years)	5-7	4-6	6-8	5-7
Industrial Water Recycling Rate	60-75%	85-92%	95-98%	40-60%
Project Development Timeline (months)	36-60	18-30	12-18	48-72
O&M Cost ($/m3 produced)	$0.45-0.75	$0.35-0.55	$0.25-0.40	$0.60-1.00
Brine Recovery Rate	30-40%	45-55%	60-70%	20-30%

What's Different in China

State-Directed Deployment at Scale

China's approach to desalination deployment differs fundamentally from market-driven models in the Middle East, Australia, or Israel. Provincial governments receive binding water security targets from the State Council, and desalination capacity quotas are incorporated into local economic development plans. Shandong Province, which accounts for approximately 35% of China's total desalination capacity, mandates that all new coastal industrial parks include on-site desalination or advanced water recycling facilities. This regulatory architecture eliminates the extended procurement and approval cycles that characterize desalination projects in democratic governance systems.

The Tianjin Binhai New Area Desalination Hub illustrates this approach. Commissioned in 2023 with initial capacity of 200,000 cubic meters per day and designed for expansion to 500,000 cubic meters per day, the project moved from feasibility study to commercial operation in 26 months. Comparable projects in the Middle East typically require 48 to 72 months. The compressed timeline reflects both the authority of state planning agencies and the standardization of plant designs around proven Chinese-manufactured components.

Cost Advantages Through Domestic Supply Chains

China has systematically developed domestic manufacturing capacity across the desalination value chain, reducing equipment costs by 30 to 50% compared to international benchmarks. High-pressure pumps, energy recovery devices, pressure vessels, and instrumentation are now produced domestically at scale. The Qingdao Beihai Desalination Project, completed in 2024 with 100,000 cubic meters per day capacity, achieved a fully installed cost of approximately $750 per cubic meter per day of capacity, roughly half the cost of comparable plants in the Gulf Cooperation Council countries.

This cost advantage extends to operations. Chinese desalination plants benefit from lower labor costs, proximity to spare parts manufacturing, and increasingly competitive domestic membrane production. Operating costs for well-managed Chinese seawater reverse osmosis plants range from $0.35 to $0.55 per cubic meter, compared to $0.60 to $1.00 per cubic meter in the Middle East and $0.50 to $0.80 in the Mediterranean region.

Integration with Industrial Ecology

China's most distinctive contribution to global water treatment practice is the integration of desalination and advanced treatment within industrial ecology frameworks. The Caofeidian Industrial Zone in Hebei Province operates a closed-loop water system serving steel, petrochemical, and power generation facilities. Seawater desalination produces fresh water for industrial processes; wastewater from steel cooling is treated and recycled through membrane bioreactor systems; brine concentrate from desalination is processed to extract sodium chloride, magnesium hydroxide, and potassium chloride; and residual brine is used for aquaculture salt ponds.

This circular approach achieves system-level water recovery rates exceeding 95%, compared to the 40 to 50% typical of conventional desalination plants that discharge brine to the ocean. The Caofeidian model has been replicated at seven additional coastal industrial zones since 2023, with the Ministry of Industry and Information Technology requiring similar integrated water management for all new heavy industrial coastal developments.

Brine Management Innovation

Brine disposal represents the most significant environmental liability of conventional desalination. China has invested heavily in brine valorization technologies that convert waste streams into revenue sources. The Shouguang Salt Chemical Industrial Park in Shandong Province processes desalination brine from three nearby plants totaling 150,000 cubic meters per day capacity, extracting commercial-grade salt, magnesium compounds, bromine, and lithium. Revenue from mineral extraction offsets 25 to 35% of desalination operating costs, fundamentally improving project economics.

Research institutions including the Hangzhou Water Treatment Technology Development Center and the Chinese Academy of Sciences Institute of Oceanology are advancing selective electrodialysis and membrane distillation crystallization technologies that could increase mineral recovery yields by an additional 40 to 60% by 2028.

What's Not Working

Membrane Performance in High-Fouling Waters

Chinese coastal waters, particularly in the Bohai Sea and Yellow Sea, present membrane fouling challenges that exceed those in cleaner oceanic environments. Algal blooms, sediment loading from major river systems, and industrial pollutant concentrations require more aggressive pretreatment, increasing both capital and operating costs. Several projects in Liaoning Province have experienced membrane replacement cycles 30 to 40% shorter than design specifications, eroding project economics.

Energy Intensity Concerns

Despite policy commitments to renewable-powered desalination, the majority of existing Chinese plants draw from coal-heavy grid electricity. In Shandong Province, where coal generates approximately 65% of electricity, a desalination plant consuming 4 kWh per cubic meter produces water with an embedded carbon intensity of roughly 2.6 kg CO2 per cubic meter. This figure is higher than gravity-fed surface water treatment (0.1 to 0.3 kg CO2 per cubic meter) and raises questions about the net climate impact of desalination as a water security strategy.

Foreign Market Access Barriers

International companies face significant barriers to direct participation in China's desalination market. Technology transfer requirements, domestic content mandates, and procurement preferences for state-owned enterprises limit foreign firms to technology licensing and equipment supply roles. Companies including IDE Technologies (Israel), Acciona (Spain), and Veolia (France) maintain joint ventures with Chinese partners but report that intellectual property protection remains a persistent concern.

Key Players

Dominant Domestic Firms

BEWG (Beijing Enterprises Water Group) operates the largest portfolio of water treatment facilities in China, with combined capacity exceeding 35 million cubic meters per day across desalination, municipal treatment, and industrial recycling. Their vertically integrated model spans engineering, procurement, construction, and operations.

OriginWater specializes in membrane bioreactor technology and has developed proprietary ultrafiltration membranes that compete with imported products for most applications. The company operates over 1,000 water treatment plants across China.

Hangzhou Water Treatment Technology Development Center functions as both a research institution and a commercial technology provider, particularly for thermal and membrane hybrid desalination systems suited to the chemical and petrochemical sectors.

International Partners

Toray Industries (Japan) maintains the largest foreign membrane manufacturing facility in China, producing reverse osmosis and nanofiltration membranes at its Nantong plant for both domestic consumption and export.

Danfoss (Denmark) supplies high-pressure pumps and energy recovery devices through partnerships with major Chinese EPC contractors, holding approximately 25% market share in equipment for plants above 50,000 cubic meters per day.

Gradiant (Singapore/US) has entered the Chinese market through partnerships focused on brine treatment and zero liquid discharge systems for industrial customers willing to pay premium prices for water recovery rates above 95%.

Action Checklist

• Assess whether your technology addresses a gap in China's domestic capability, particularly in high-performance membranes, energy recovery, or brine valorization
• Identify potential joint venture partners among provincial water utilities and state-owned engineering firms before approaching the market independently
• Review the 15th Five-Year Plan targets for desalination capacity and industrial water recycling to identify the highest-growth provincial markets
• Evaluate intellectual property protection strategies including patents, trade secrets, and contractual mechanisms specific to Chinese commercial law
• Analyze whether your technology integrates with China's renewable energy mandates for new desalination capacity
• Model project economics using Chinese cost benchmarks rather than global averages, accounting for lower labor and equipment costs
• Engage with the China Desalination Association and provincial water resource bureaus to understand procurement cycles and qualification requirements

Sources

• Ministry of Water Resources, People's Republic of China. (2025). National Water Resources Bulletin 2024. Beijing: MWR Publications.
• National Development and Reform Commission. (2024). Desalination Industry Development Action Plan (Revised). Beijing: NDRC.
• China Water Network. (2025). Annual Report on China's Desalination Industry 2024-2025. Beijing: E20 Environment Platform.
• Global Water Intelligence. (2025). China Desalination Market Forecast 2025-2035. Oxford: GWI Publishing.
• International Desalination Association. (2025). IDA Desalination Yearbook 2024-2025. Topsfield, MA: IDA.
• Chinese Academy of Sciences. (2025). Membrane Technology Innovation for Water Security: Progress Report. Beijing: CAS Institute of Oceanology.
• World Bank. (2024). China Water Sector Assessment: Challenges and Opportunities for Sustainable Management. Washington, DC: World Bank Group.