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Energy Recovery Water Treatment Companies
Energy recovery devices (ERDs) and heat recovery integrators reducing specific energy consumption in treatment plants.
This page is a good fit if you need:
- Filtration or Reverse Osmosis (RO) capabilities
- Suppliers with utilities sector experience
- Providers operating in United Kingdom or Netherlands
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Showing 1-20 of 33
33 results from 33 matched providers

Brine Consulting
BRINE CONSULTING delivers senior-level strategy, technical design, and actionable insight across the full lifecycle of water-related challenges. We support clients with advisory and due diligence, advanced brine management and resource recovery, industrial and municipal water reuse, and MLD/ZLD systems. Our team also leads ESG and climate-resilience strategy, innovation scouting, and international development and PPP advisory. With deep specialization in desalination, brine valorization, circular economy models, and high-impact infrastructure, we help organizations turn water and waste streams into opportunities, providing clear thinking, rapid delivery, and solutions built for real-world results.

Ecosystems International
PT Ecosystems International (PT ESI) was established at Jakarta on 21st November 2006. We are an industrial effluent treatment systems integrator specializing in electrocoagulation (EC), a unique waste water treatment profile. PT ESI has capabilities in designing complete waste water treatment solutions by combining various effluent treatment systems such as the electro-coagulation, biological, chemical processes and membrane filtration, offering its customers a wide and comprehensive range of solutions, tailored to suit their various needs – ranging from basic effluent treatment for discharge to effluent recycling for water reuse. The Company is experienced in handling the design, engineering, procurement, construction and operation of new Effluent Treatment Plants (“ETP”) and possesses expertise in retrofitting existing ETP to increase the flow rate and treatment capability without any major infrastructure increase PT ESI is also a premier waste water treatment service company specializing in handling waste water generated from Exploration (Drilling) and Produced Water. Customers in Indonesia include major Oil & Gas companies such as Pertamina, Exxon, Chevron, Petro-China and Medco. Operations in Indonesia are provided by both mobile and fixed units. At drill sites where waste-water recycling is required, PT ESI supplement these treatment units with skid mounted mobile Reverse Osmosis systems. The technologies and solutions employed by PT ESI are developed in-house and examples of these are its proprietary Trident™ Electro Contaminant Removal (“ECR”) system, the Stage Contaminant Removal (“SCR”) process and Mobile On-Site Waste-Water Treatment (“OWT”) units

BAISEN TECHNOLOGY CO.,LTD
Our manufacturing plant in Guangdong, China, was established in 2007 and has served various municipal equipment manufacturers in China for nearly 20 years. We have been exporting products for almost 10 years, such as MBBRs, tube settlers, and aerators. The factory is located near Shenzhen Port, making sea freight extremely convenient.

Chemipol S.A.
Chemipol S.A. is a leading manufacturer and supplier of biocides, additives, and specialty chemicals, serving diverse industries such as utilities, manufacturing, and energy production. Based in Spain, Chemipol provides advanced water treatment solutions, including desalination and wastewater treatment technologies, across Europe.

PolyCera, a brand of PSP.US, Inc.
PolyCera® membrane products, a PSP.US, Inc. brand, set new standards in performance and total cost of ownership, aiming to deliver the highest quality of treatment with unrivaled reliability at the lowest total lifetime cost through the reduction of OpEx and CapEx. With current installed capacity exceeding 50 MGD, PolyCera membranes have been used in a wide range of projects including: Clean Energy, Fossil Fuel Energy, Industrial Wastewater, Process Separation and Municipal Water and Wastewater. Show more
Thermax Chemical Europe A/S
Thermax Chemical Europe A/S is a leading provider of engineering solutions, specializing in heating, cooling, water and waste management, and air pollution control. With a strong presence in Europe, the Middle East, and Asia-Pacific, the company delivers comprehensive services in energy transition and environmental sustainability.

Toray Membrane Europe AG
Toray Membrane Europe AG is a leading manufacturer of advanced membrane technologies, including RO, NF, UF, and MBR systems. These innovations are pivotal in producing clean water and enabling resource recovery across various industries, supporting sustainable water treatment solutions globally.
Aiolia International Corp.
Aiolia International Corp. specializes in advanced water purification and treatment solutions, offering cutting-edge technologies for industrial and municipal applications. With expertise in membrane technologies and ultra-pure water systems, they serve key industries such as utilities and manufacturing across North America.

Energy Recovery, Inc.
Energy Recovery, Inc. specializes in innovative energy recovery solutions, enhancing the efficiency and sustainability of water treatment and desalination systems. With a focus on reducing energy consumption and emissions, the company serves diverse industries, including utilities and manufacturing, across global markets.

Nuoro
Nuoro is an independent engineering cooperative in Belgium, specializing in circular water and energy projects. As consultants, tech integrators, and main contractors, they drive sustainable innovation in water treatment, reuse, and energy recovery, serving industries and public utilities across Europe.

Waterleau
Waterleau is a world-leading water technology company based in Belgium, specializing in process water, wastewater treatment, water recovery, and PFAS removal. Committed to sustainable water management, they offer proprietary technologies for high-capacity treatment and energy recovery, serving industries like manufacturing and utilities.

Industria Gratt Europa, Lda.
Gratt Indústria e Tecnologia Ambiental specializes in providing engineering and environmental technology solutions across Europe and Latin America. They focus on treatment solutions, water reuse, and infrastructure systems, catering to utilities and energy sectors.

KEIKEN ENGINEERING
KEIKEN Engineering provides engineering solutions for seawater desalination and industrial water reuse applications, specializing in reverse osmosis and membrane-based treatment systems.
Danfoss
Danfoss specializes in advanced technologies for seawater reverse osmosis (SWRO) and water reuse, focusing on energy-efficient solutions. With a strong presence in Europe, Danfoss serves the utilities and energy production industries, providing innovative equipment and technology solutions.

SNB
SNB (Slibverwerking Noord-Brabant) verwerkt zuiveringsslib van Brabantse waterschappen. SNB zet slib om in duurzame energie en terugwinbare grondstoffen zoals fosfaat.

Puragen Activated Carbons
Puragen Activated Carbons specializes in providing high-quality activated carbon filtration solutions for air, water, and energy applications. With a focus on sustainability and cost-effectiveness, Puragen serves various industries, including municipal water, industrial manufacturing, and waste management, across Europe.

PNR ITALIA Srl
We produce a comprehensive range of spraying solutions, encompassing everything from small-scale nozzles to large industrial spraying systems. Our diverse product line includes various types of nozzles tailored to meet the specific requirements of every application and customer need. The company was established in Milan in November 1968, focusing on distributing parts and components for fire protection systems. Over time, we expanded our offerings to include a diverse range of industrial sprayers tailored to various applications. In addition to our distribution and manufacturing of fire protection system components and industrial sprayers, we specialize in designing and producing pneumatic spray nozzles for industrial use and tank washing nozzles. Our product line also encompasses a variety of complementary accessories essential for industrial washing, including filters, spray guns, and hoses. Furthermore, we offer ejectors, blower nozzles, swivel joints, and hose clamps to provide comprehensive solutions for our customers' needs. PNR Italia is part of the Tecomec Group and oversees four other affiliated companies to form PNR Company, a consolidated reality with a significant presence on the market.

AE Yates Group
Established in 1870, AE Yates is a progressive civil engineering contractor with an enviable track record of successfully delivering technically demanding high quality works to the complete satisfaction of a wide variety of public and private customers. An Integrated Construction Company A E Yates has grown to be an integrated construction company with a turnover of £50m, employing over 170 managerial, professional, technical and operational staff. Our company headquarters, based in Bolton, are strategically located to serve and communicate with clients throughout the United Kingdom with immediate access to road, rail and air transport facilities. We also have an operating base in Sheffield. AE Yates Group The group companies add value for customers not just in their specialism. When working together they can offer an integrated service through resource sharing and joint management of activities. Operational interfaces are removed eliminating potential co-ordination, management and programming issues for customers. AE Yates Civil Engineering Ltd AE Yates Directional Drilling Combined Soil Stabilisation Side Grip Piling SPI Piling Tritech Ground Engineering AE Yates Haulage Equipment and Skills Investment in the development of highly skilled operational teams up to date equipment has reinforced and enhanced our capability in all areas of operations. We own and operate an extensive fleet of general civil engineering and specialist plant and equipment. Experienced and Dedicated We are a highly experienced and respected civil engineering contractor operating to an Integrated Management System which is fully accredited to IS 9001:2015, ISO14001:2015 and ISO45001:2018 by BSI. We are fully committed to meeting the required standards of quality, customer care, environmental awareness, safety, health, time and cost demanded by our clients. We are fully supportive of the UK industry’s drive towards Continuous Improvement, Best Value and Constructing Excellence.

Gilbert Gilkes & Gordon Ltd
Gilbert Gilkes & Gordon Ltd is a privately owned, internationally established manufacturing business based in the UK. Hydro & Pump Specialists since 1856, Gilkes now export to over 85 Countries around the world. Gilkes Hydro offer a reputable single source solution for a range of hydropower turbines. Our range of Pelton, Francis and Turgo Turbines cover low, medium and high head projects capable of generating up to 30MW per unit and includes compact solutions for the 50kW to 100kW market as well as a new Streamline range designed for the sub 1MW market. Having manufactured over 6800 turbines, Gilkes offers complete water to wire solutions for small hydroelectric developments. Activities include design, manufacture, installation, commissioning, testing, routine service and plant upgrade. Gilkes expertise and experience allow a full range of products and services to be offered for the following applications: Run of River Dam & Reservoir Storage Energy Recovery Rural Electrification Plant Modernisation & Optimisation Long Term Service Contracts

JN Bentley Ltd
JN Bentley Ltd (JNB) is a leading, privately owned construction services provider in the UK. We now have an annual turnover in the region of £100 million, generated from projects in both the building and civil engineering markets. JN Bentley JN Bentley delivers civil engineering contracting services, together with mechanical and electrical expertise. Founded in 1972, the company has grown largely from repeat work, maintaining a focus on providing construction services with an open and honest approach. The JN Bentley team numbers over 2,000 colleagues. We pride ourselves on our large, directly employed construction workforce, a team that gives us and our clients added assurances for safety and quality. We look to find innovative solutions to traditional construction challenges, applying the latest technologies to drive efficiency and reach sustainable outcomes. Across JN Bentley and our design and build companies MMB and JBA Bentley, annual revenue now exceeds £500 million. Mott MacDonald Bentley (MMB) MMB provides fully integrated civil engineering feasibility, design, construction and commissioning services to the UK water sector. Established in 1999, it harnesses the contracting strength of JN Bentley and the design specialisms of Mott MacDonald to form a 3,000-strong team – with further expertise brought in from across the Mott MacDonald Group when required. MMB was formed specifically to deliver long-term, high-volume capital programmes collaboratively with water companies. With a focus on innovation, affordability, and flexibility, since securing its first contracts with Yorkshire Water in AMP3, MMB has grown to deliver work for eight of the largest water companies in the UK.
Pressure Exchangers, ERDs, and Energy Audits in Water Treatment Desalination
Energy recovery in reverse osmosis desalination is one of the highest-impact engineering decisions in system design. In seawater RO systems, 35–45% of applied feed pressure remains in the concentrate stream when it exits the membrane array at nearly feed pressure. Without energy recovery, this pressure energy is dissipated as heat across a pressure-reducing valve—a pure thermodynamic loss. Pressure exchangers (PX devices) developed by Energy Recovery Inc. and isobaric pressure exchangers from other manufacturers transfer this energy back to the incoming feed with isentropic efficiency above 97%, reducing net energy consumption from 6–8 kWh/m³ to 2–3 kWh/m³ in SWRO applications.
Turbochargers and turbine-driven centrifugal pumps (Pelton wheel ERDs) are centrifugal energy recovery devices with efficiency typically in the 85–90% range—lower than isobaric PX devices but simpler to integrate in retrofit applications where the high-pressure pump cannot easily be supplemented by a pressure exchanger circuit. Turbochargers are appropriate for smaller SWRO systems and for brackish water RO at high recovery where energy recovery value is lower. For new SWRO plants above 500 m³/day, isobaric pressure exchangers are standard specification based on their superior efficiency and demonstrated reliability.
Energy auditing of existing RO systems identifies opportunities to reduce specific energy consumption through operational changes—pump impeller trimming, recovery rate optimization, interstage pressure balancing—as well as retrofit upgrades. An energy audit should establish a baseline specific energy (kWh/m³ of permeate) under current operating conditions, calculate the theoretical minimum energy for the same recovery rate, identify the gap sources (pump efficiency, hydraulic losses, suboptimal recovery), and develop a prioritized improvement roadmap with payback calculations. Providers who deliver audits without the ability to supply and install the recommended equipment are less accountable for the projected savings.
Frequently Asked Questions
How does a pressure exchanger work in a seawater RO system?
A pressure exchanger (PX) is a rotary positive-displacement device that uses the hydraulic energy in the high-pressure RO concentrate stream to directly pressurize a portion of the low-pressure seawater feed, reducing the work required from the high-pressure pump. Inside the PX rotor, concentrate and seawater alternate in sealed chambers with minimal mixing—less than 1–3% mixing by volume. The pressurized seawater from the PX is then boosted by a small circulation pump to exactly match the RO feed pressure before entering the membrane array. The net effect is that only the portion of feed not processed by the PX requires full high-pressure pumping, reducing total electrical energy consumption by 50–60% compared to a system without energy recovery.
At what scale does energy recovery become economically justified in brackish water RO?
For brackish water RO systems, the economics of energy recovery depend on the operating pressure, recovery rate, and local electricity cost. BWRO systems typically operate at 10–20 bar feed pressure compared to 55–70 bar for SWRO, so the energy recovery potential per cubic meter is lower. As a general guideline, isobaric energy recovery becomes cost-effective for BWRO systems above 1,000 m³/day at electricity prices above $0.08/kWh. Turbochargers are sometimes used in smaller BWRO systems for modest energy savings. Run a site-specific IRR analysis before assuming energy recovery is or is not justified for your application.
What is specific energy consumption (SEC) for RO and what is a good benchmark?
Specific energy consumption (SEC) measures electrical energy consumed per cubic meter of permeate produced (kWh/m³). For SWRO with modern pressure exchangers and high-efficiency pumps, best-practice SEC is 2.0–2.5 kWh/m³. Older SWRO plants without energy recovery consume 6–8 kWh/m³. For brackish water RO at 75% recovery, well-designed systems achieve 0.4–0.8 kWh/m³. If your system's SEC significantly exceeds these benchmarks, an energy audit should be commissioned to identify whether the gap is attributable to pump efficiency, suboptimal operating recovery, energy recovery device performance, or hydraulic system losses.
What should an energy audit of an existing RO system include?
A comprehensive RO energy audit covers: measurement of specific energy consumption under current operating conditions at multiple flow rates, pump efficiency testing (comparing actual shaft power and flow against pump curve data), energy recovery device performance testing (PX or turbocharger efficiency measurement), operating recovery rate analysis against water chemistry limits, and hydraulic loss assessment across filters, piping, and valves. The output should be a ranked improvement list with projected SEC reduction, capital cost, and simple payback period for each measure—distinguishing free operational changes from capital investments.