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Our purpose-engineered evaporators are designed to handle the high-salinity, high-COD RO concentrate generated in landfill leachate treatment systems — achieving zero liquid discharge and full regulatory compliance.
Landfill leachate is one of the most complex and hazardous wastewater streams produced in municipal solid waste management. It contains high concentrations of ammonia nitrogen, heavy metals, persistent organic pollutants, and dissolved solids. Modern leachate treatment plants typically employ a multi-stage process combining biological treatment, membrane filtration, and reverse osmosis (RO) to achieve the required effluent standards.
However, this process inevitably generates a high-salinity, high-concentration RO reject (concentrate) stream — typically accounting for 20–40% of the total feed volume — that cannot be discharged directly and is increasingly difficult to manage. Traditional disposal methods such as re-injection into the landfill or off-site transport are becoming economically and environmentally unacceptable under tightening global regulations.
The RO Reject Water Evaporator has emerged as the definitive solution for the final treatment and disposal of this concentrate. By applying thermal evaporation technology, the system reduces the concentrate volume by up to 90–95%, producing a clean distillate suitable for reuse and a solid or semi-solid residue for safe landfill disposal or further resource recovery.
The evaporation process works by applying heat to the RO concentrate, causing water to vaporize while dissolved salts, organics, and other contaminants remain in the liquid phase and become progressively more concentrated. The generated steam is condensed to produce clean distillate water, while the concentrated brine is further processed — either crystallized into solid salts or reduced to a paste-like slurry for disposal.
Jiangsu Zongheng Concentration & Drying Equipment Co., Ltd. has developed a comprehensive range of evaporator technologies specifically optimized for the challenging characteristics of landfill leachate RO reject, including Multi-Effect Evaporators (MEE), Mechanical Vapor Recompression (MVR) evaporators, Thermal Vapor Recompression (TVR) systems, and Waste Heat Evaporators — each offering distinct advantages in terms of energy consumption, capital cost, and operational flexibility.
With over three decades of manufacturing experience and a track record of successful installations across food fermentation, chemical, pharmaceutical, and environmental protection industries, Jiangsu Zongheng brings unparalleled technical depth to the design and delivery of RO reject evaporation systems for landfill leachate applications.
Engineered for the extreme conditions of landfill leachate RO concentrate — high salinity, scaling tendency, corrosive organics, and variable feed quality.
MVR technology recycles latent heat from generated steam, achieving steam consumption as low as 0.03–0.06 kg per kg of evaporated water — reducing operating costs by up to 70% versus single-effect evaporation.
Our integrated evaporation and crystallization systems achieve true ZLD, eliminating liquid effluent entirely and producing only solid or semi-solid residues compliant with landfill disposal regulations.
Specially designed forced-circulation evaporator bodies with optimized flow velocities and proprietary surface treatments minimize scaling from calcium sulfate, silica, and organic foulants common in leachate concentrates.
Wetted parts constructed from duplex stainless steel, titanium, or high-alloy materials selected to withstand the aggressive chemical environment of high-chloride, high-ammonia leachate concentrates.
Systems capable of achieving concentration factors of 10:1 to 20:1, reducing the volume of RO reject requiring final disposal by 90–95% and dramatically lowering downstream management costs.
PLC/SCADA-based automation with real-time monitoring of temperature, pressure, concentration, and flow parameters — enabling unmanned continuous operation and remote diagnostics.
The global landfill leachate treatment market is undergoing rapid transformation, driven by stricter environmental legislation, urban expansion, and the growing imperative for sustainable waste management.
The global landfill leachate treatment market was valued at over USD 3.2 billion in 2023 and is projected to exceed USD 6.5 billion by 2032, growing at a CAGR of approximately 8.2%. RO reject evaporation systems represent the fastest-growing segment, driven by ZLD mandates in China, the EU, and North America. China alone has over 2,000 operating municipal landfills generating leachate that requires advanced treatment, creating enormous demand for RO concentrate management solutions.
China's GB 16889-2008 standard and its forthcoming revisions impose increasingly stringent limits on landfill leachate discharge. The EU Landfill Directive and the US EPA's Resource Conservation and Recovery Act (RCRA) similarly mandate near-zero discharge. These regulatory pressures are compelling landfill operators worldwide to invest in terminal evaporation technology as the only technically viable path to full compliance, making RO reject evaporators a non-negotiable component of modern leachate treatment systems.
Mechanical Vapor Recompression (MVR) evaporators are rapidly displacing conventional multi-effect systems in new installations due to their dramatically lower energy consumption (typically 15–30 kWh per ton of evaporated water versus 60–80 kg of steam for single-effect systems). The falling cost of electricity from renewable sources is further enhancing the economics of MVR systems, making them the technology of choice for large-scale landfill leachate ZLD projects globally.
The next frontier in landfill leachate management is transitioning from disposal to resource recovery. Advanced evaporation and crystallization systems are being developed to recover valuable salts, ammonia (as ammonium sulfate fertilizer), and clean water from the leachate concentrate stream. This circular economy approach not only reduces disposal costs but can generate revenue streams, fundamentally changing the economics of leachate management and driving further investment in sophisticated evaporation technology.
Beyond standard municipal landfill applications, RO reject evaporators address a diverse range of challenging industrial and environmental scenarios where conventional treatment methods fall short.
The primary application: treating the RO concentrate from municipal leachate plants to achieve ZLD. Systems are designed for continuous operation with variable feed quality, handling seasonal fluctuations in leachate volume and composition typical of MSW landfills.
Hazardous waste facilities generate leachate with extreme concentrations of heavy metals and toxic organics. Our evaporators use specialized corrosion-resistant alloys and closed-loop vapor handling to safely concentrate and immobilize these contaminants for secure final disposal.
Leachate from fly ash disposal sites contains high chloride, sulfate, and heavy metal loads. RO reject from these sites requires specialized evaporation with salt crystallization to separately recover sodium chloride and sodium sulfate for industrial reuse or safe disposal.
Chemical, mining, and manufacturing waste landfills produce highly variable leachate compositions. Our evaporators are custom-engineered for each application, with material selection and process design tailored to the specific contaminant profile of the industrial waste stream.
Remediation of legacy landfills often uncovers highly concentrated, aged leachate that overwhelms conventional treatment systems. RO reject evaporators provide a robust, scalable solution for treating these difficult streams during site remediation and closure projects.
Innovative integrated systems use waste heat from landfill gas (LFG) combustion engines or turbines to drive evaporation of the leachate RO concentrate — dramatically reducing operating costs and improving the overall energy balance of the landfill facility.
Jiangsu Zongheng Concentration & Drying Equipment Co., Ltd.
Jiangsu Zongheng Concentration & Drying Equipment Co., Ltd. (formerly Yixing Yangxi Light Industry Machinery Factory), founded in 1992, is located in Zhoutie Town, Yixing City, on the shores of the beautiful Taihu Lake. The company covers an area of over 54,000 square meters, with a production workshop area of over 22,000 square meters.
Jiangsu Zongheng is a modern high-tech enterprise specializing in the manufacturing of concentration, drying, starch industry, alcohol DDGS, and Category III medium & low-pressure vessel equipment. It is currently a member enterprise of the China Starch and Alcohol Association. Its products are widely used in industries such as food fermentation, alcohol, chemical, pharmaceutical, environmental protection, and petrochemical.
Jiangsu Zongheng is always committed to exploration and innovation. Through years of sincere effort and user support, it has achieved sustained development. Main products include evaporation plants, comprising Multi-Effect Evaporators, Thermal Vapor Recompressors (TVR), Waste Heat Evaporators, and Mechanical Vapor Recompressors (MVR, achieving minimal unit energy consumption). These are widely used for liquid concentration, including distillates, alcohol stillage, ammonium sulfate, corn steep liquor, itaconic acid, threonine, starch sugar, sorbitol, glucose, fructose, trehalose, erythritol, organic wastewater, high-salinity wastewater, etc., making the company one of the domestic manufacturers with the most extensive product variety.
For landfill leachate RO reject applications, our MVR evaporators represent the gold standard — recycling the latent heat of evaporated steam through mechanical compression, achieving steam consumption near zero and reducing operating costs to a minimum while handling the high-TDS, scaling-prone concentrate streams typical of leachate treatment plants.
The company's other main products include Tube Bundle Dryers, with design and manufacturing capabilities reaching 1600m² (making it a primary manufacturer of large tube bundle dryers). Other main products such as Single Screw Fiber & Germ Dehydrators and Wash Cyclones are recognized as high-quality products by starch manufacturers and the industry. High-quality products and a sincere service attitude have won consistent praise and trust from numerous users at home and abroad, fully demonstrating the company's first-class technical advantages and manufacturing capabilities for large-scale equipment.
In the context of landfill leachate RO reject treatment, our tube bundle dryers serve as the critical downstream step after evaporation — converting the concentrated brine slurry into dry solid residues for safe landfill disposal or further salt recovery, completing the ZLD process chain from liquid concentrate to solid waste.
In March 2002, the company took the lead in obtaining ISO9001:2015 international quality system certification (Certificate No.: 45021), establishing a complete quality assurance system aligned with international standards. In July 2007, it became a Jiangsu Provincial High-Tech Enterprise. In April 2009, the company obtained the Special Equipment Manufacturing License of the People's Republic of China (License No.: TS2232C42). In August 2012, it acquired the ASME "U" Stamp authorization, marking the company's entry into a new phase of development. The company possesses strong R&D capabilities and advanced manufacturing processes, currently employing over 3 senior engineers and more than 20 engineers and assistant engineers. Multiple innovative technologies have been patented, and many products hold leading positions domestically.
The company currently holds an absolutely leading position in evaporation technology and has extensive cooperation with many renowned large domestic group companies, including Zhuofeng Biology, Meihua Group, Yufeng Group, Yihai Kerry, North China Pharmaceutical Group, Harbin Pharmaceutical Group, Shouguang Juneng, Qilu Pharmaceutical, Qiyuan Pharmaceutical, Xiwang Group, Shengtai Biology, Zhejiang Huakang, Kelun Pharmaceutical (Yili), and Shandong Tianli.
While meeting domestic market demand, the company's DDGS alcohol equipment and tube bundle dryer series products have been exported to Russia and Southeast Asian markets.
We are capable of providing professional technical support and after-sales service nationwide for our vast user base. High-quality products and their unique solutions not only enhance our corporate economic benefits but also bring us satisfaction by solving processing challenges for our clients.
We warmly welcome friends from various industries, both domestic and international, to visit us for cooperation and mutual development!
Explore our full range of industrial evaporator systems — each engineered to handle the unique challenges of RO concentrate treatment in landfill leachate management applications.
