Waste-to-Energy Wastewater Treatment Systems - Market Share Analysis, Industry Trends & Statistics, Growth Forecasts (2026-2031)

The waste-to-Energy wastewater treatment systems market was valued at USD 0.79 billion in 2025 and is estimated to grow from USD 0.84 billion in 2026 to reach USD 1.14 billion by 2031, at a CAGR of 6.34% during the forecast period (2026-2031). This report is Segmented by Wastewater Stream (Flue Gas Desulfurization (FGD) Wastewater, and More), Treatment Technology (Physical and Chemical Treatment Systems, and More), Plant Type (Municipal Solid Waste Waste-To-Energy Plants, and More), Project Type (New Installations, and More), and Geography (Asia-Pacific, and More). The Market Forecasts are Provided in Terms of Value (USD).

Global Waste-to-Energy Wastewater Treatment Systems Market Trends and Insights

Tightening Effluent and Combustion-Residue Compliance Requirements

The U.S. Environmental Protection Agency’s final Steam Electric Effluent Limitations Guidelines, 40 Code of Federal Regulations (CFR) Part 423, took effect on July 8, 2024. The rule requires zero discharge for flue gas desulfurization wastewater and combustion-residual leachate at covered facilities, with a direct-discharger compliance date no later than December 31, 2034. It specifies chemical precipitation and membrane filtration with 100% permeate recycle for flue gas desulfurization wastewater, which limits the role of simple discharge systems. The European Union’s recast Urban Wastewater Treatment Directive, Directive (EU) 2024/3019, entered into force on January 1, 2025, and adds energy-management audits and energy-neutrality requirements for larger treatment plants. These requirements favor vendors with validated, integrated treatment trains that can document performance, recycling rates, and operating outcomes. The waste-to-energy wastewater treatment systems market is consequently seeing compliance requirements influence technology selection, not only final effluent limits.

Expansion of Water Reuse and Zero Liquid Discharge in Water-Stressed Plants

Water scarcity can support zero liquid discharge investment even before a formal compliance deadline applies. A 2026 scientific assessment found that renewable-energy integration could reduce emissions from circular zero liquid discharge systems by up to 72%, although higher capital requirements extended payback beyond the planning horizon for many industrial facilities. This trade-off makes hybrid process configurations important because biological and membrane stages can reduce the volume reaching thermal evaporation. WaterNext’s 2026 case study at Vardhman Textiles reported 97.5% water recovery through a membrane bioreactor, multistage reverse osmosis, and concentrated reverse osmosis train. The remaining 2.5% of influent required thermal evaporation, showing why front-end separation can reduce energy demand and the operating duty of downstream evaporation equipment. The waste-to-energy wastewater treatment systems market benefits where plants seek water reuse and lower freshwater dependence alongside discharge control.

High CAPEX and Energy Consumption of Thermal ZLD Systems

Thermal zero liquid discharge systems remain the proven option for fully eliminating liquid discharge from high-salinity waste-to-energy streams. Their energy requirement of 15-25 kilowatt-hours per cubic meter of treated water can produce operating costs that challenge project economics for smaller operators. A 2026 techno-economic assessment found that solar photovoltaic integration reduced emissions by up to 72%, but it also raised capital costs and pushed payback beyond the planning horizon for most industrial facilities. This can lead operators to defer projects until a compliance obligation becomes unavoidable. Financing constraints are particularly important in South America and Southeast Asia, where concessional finance and technology leasing remain limited, particularly at sites with lower wastewater volumes or limited energy-recovery options. The waste-to-energy wastewater treatment systems market may therefore produce larger contract values per project while the number of thermal zero liquid discharge projects remain constrained.

Other drivers and restraints analyzed in the detailed report include:

• Growth of Energy-Positive Wastewater and Sludge Operations
• Retrofit Demand Across Aging Waste-to-Energy Assets
• Variable Wastewater Chemistry and Inconsistent Feedstock Quality

Segment Analysis

Flue Gas Desulfurization (FGD) wastewater held 32.15% of the waste-to-energy wastewater treatment systems market share in 2025. Its sulfate, chloride, selenium, mercury, and arsenic content requires multi-barrier treatment that can include chemical precipitation, biological selenium reduction, and membrane polishing. The U.S. rule requires membrane filtration and 100% permeate recycle for covered flue gas desulfurization streams, reinforcing the need for advanced treatment design. Boiler blowdown water is increasingly being considered for internal recirculation rather than simple discharge. This change requires conditioning equipment in plant areas that previously received limited treatment attention.

The ash handling and leachate water is forecast to expand at a 7.15% CAGR from 2026 to 2031. More intensive fly ash separation for heavy-metal recovery raises associated leachate volumes and increases demand for treatment equipment. Dalian’s Phase 2 incineration plant used pretreatment, anaerobic treatment, an external membrane bioreactor, nanofiltration, and reverse osmosis to meet China’s GB/T 19923-2024 reuse standard for cooling and boiler makeup water. Cooling tower blowdown, process water, and landfill leachate at co-located facilities are also being drawn into integrated networks. The waste-to-energy wastewater treatment systems market gains incremental equipment demand as zero liquid discharge requirements become more common.

Physical and chemical treatment systems held 38.23% of revenue in 2025. Precipitation and neutralization remain the validated first-stage options for flue gas desulfurization and ash-leachate streams with extreme pH and heavy-metal concentrations. These systems form the core of many treatment trains because they remove contaminants before polishing stages. Membrane treatment systems, including ultrafiltration, nanofiltration, and reverse osmosis, are increasingly used where compact polishing equipment is needed. In the waste-to-energy wastewater treatment systems market, Thermal Treatment Systems remain the endpoint for zero liquid discharge designs.

Biological treatment systems are forecast to grow at a 7.51% CAGR from 2026 to 2031. Moving bed biofilm reactors and sequencing batch reactors can be adapted for high-ammonia conditions and can reduce reagent use and secondary sludge compared with precipitation-heavy treatment. Veolia selected its AnoxKaldnes moving bed biofilm reactor technology for the USD 500 million Saudi Aramco Total Refining and Petrochemical Company (SATORP) industrial water project in Saudi Arabia. The project confirms the use of biological treatment in demanding applications. In the waste-to-energy wastewater treatment systems market, new procurements in China, India, and the European Union increasingly specify zero liquid discharge as a design objective.

Complete Report Scope:

• By Wastewater Stream
  • Flue Gas Desulfurization (FGD) Wastewater
  • Boiler Blowdown Water
  • Ash Handling and Leachate Water
  • Other Wastewater Streams (Cooling Tower Blowdown, Process Water, Landfill Leachate, Mixed Effluents)
• By Treatment Technology
  • Physical and Chemical Treatment Systems
  • Membrane Treatment Systems
  • Biological Treatment Systems
  • Thermal Treatment Systems
  • Other Treatment Technologies (Zero Liquid Discharge Systems)
• By Waste-to-Energy Plant Type
  • Municipal Solid Waste (MSW) Waste-to-Energy Plants
  • Biomass Waste-to-Energy Plants
  • Refuse-Derived Fuel (RDF) Plants
  • Other Waste-to-Energy Plant Types (Industrial Waste Incineration Plants, CHP Waste-to-Energy Plants)
• By Project Type
  • New Installations
  • Retrofit Installations
  • Operations and Maintenance (O&M) Services
  • Other Project Types (Replacement and Upgrade Projects)
• By Geography
  • Asia-Pacific
    • China
    • India
    • Japan
    • South Korea
    • ASEAN Countries
    • Rest of Asia-Pacific
  • North America
    • United States
    • Canada
    • Mexico
  • Europe
    • Germany
    • United Kingdom
    • France
    • Italy
    • NORDIC Countries
    • Russia
    • Rest of Europe
  • South America
    • Brazil
    • Argentina
    • Rest of South America
  • Middle-East and Africa
    • Saudi Arabia
    • South Africa
    • Rest of Middle-East and Africa

Geography Analysis

Asia-Pacific held 43.55% of the waste-to-energy wastewater treatment systems market share in 2025 and is forecast to grow at a 7.26% CAGR from 2026 to 2031. China’s municipal solid waste incineration rate exceeded 72% of treated urban waste, and the national target was above 90% by the end of the decade. More than 400 operating Chinese plants sustain procurement demand for wastewater treatment equipment. Chinese operators are using integrated membrane bioreactor and multistage reverse osmosis trains to meet GB/T 19923-2024 reuse requirements for cooling and boiler makeup water. These configurations position the waste-to-energy wastewater treatment systems market for ongoing demand in India and Association of Southeast Asian Nations countries.

North America and Europe are primarily driven by compliance programs and asset renewal rather than new capacity. In North America, the U.S. rule established a December 2034 zero-discharge deadline for covered flue gas desulfurization wastewater and combustion-residual leachate streams. Veolia’s USD 34 million San Francisco Public Utilities Commission contract covers MemGas biogas upgrading at the Southeast Treatment Plant and is intended to produce 68 gigawatt-hours of renewable gas each year by January 2027. The waste-to-energy wastewater treatment systems market in Europe is supported by Germany’s AbfKlärV phosphorus recovery mandate and ANDRITZ’s related retrofit projects.

South America and, Middle-East and Africa remain attracting strategic investment. Veolia’s USD 500 million SATORP project in Jubail, Saudi Arabia, has an annual capacity of 8.8 million cubic meters and integrates biological treatment, ultrafiltration, and ActifloCarb technology. The project has a 30-year operations and maintenance agreement beginning in 2028. The waste-to-energy wastewater treatment systems market in these regions needs financing structures that can address the high initial cost of advanced treatment systems. Flexible project models can help match technology choice with the scale and financing capacity of each facility.

List of Companies Covered in this Report:

• ALFA LAVAL
• ANDRITZ
• Aquatech
• Babcock & Wilcox Enterprises, Inc.
• DuPont
• GEA Group Aktiengesellschaft
• HUBER SE
• JFE Engineering Corporation
• Kanadevia Inova AG
• Keppel Seghers
• MITSUBISHI HEAVY INDUSTRIES, LTD.
• Ovivo Water Inc.
• Thermax Limited
• Veolia
• Xylem

Additional Benefits:

• The market estimate (ME) sheet in Excel format
• 3 months of analyst support