Landfill Leachate

Complex, difficult-to-treat wastewater

Landfill leachate is a complex effluent with high concentrations of organics and heavy metals that poses significant environmental risk if left untreated. Our clients require consistent permeate quality to meet stringent environmental regulations.  

RO is key to meeting strict discharge standards

While this class of wastewater typically requires several treatment steps, high performance membranes are at the heart of meeting stringent discharge regulations including zero liquid discharge (ZLD) applications. In fact, RO membranes are the only treatment technology that can consistently provide high quality treated effluent, even if the feed varies.

Treatment of Landfill Leachate

AquaZoom™ ST+ RO Membrane Performance

In the table, we show the performance of a ST+ RO membrane landfill leachate treatment system. Per the process diagram, the leachate was acidified and then mechanically prefiltered before being fed to a two-stage ST+ system.  Excellent permeate quality results from this RO membrane process.  

Experience is the difference

The AquaZoom™ reverse osmosis membrane module technology has been used in more than 81 landfill leachate treatment installations over the last 10 years. 

Let us help you with your leachate challenge

With your flow, feed quality, and discharge requirements, we can recommend the membrane and module configuration to meet your needs. Talk to us about your situation and we can help optimize overall throughput and membrane performance.   

Coal-to-Chemicals (CTX)

Complex wastewater from chemical conversion

With recent technological advancements, coal can now be economically converted into liquid fuels such as gasoline and diesel, or other petrochemicals. The coal-to-chemical process consumes high volumes of water for cooling systems and a complex wastewater is produced in the liquefaction process.  

Multiple contaminants require treatment

 CTX waste effluents typically contain salts, minerals, sulfides, chlorides, ammonia, oil & grease, and cyanides.  Each of these needs to be substantially reduced to allow for recycle, reuse, or discharge of the treated effluent.

CTX Treatment Process

AquaZoom™ RO membrane modules can be integrated into an overall CTX process train

Wastewater produced in the CTX process is characterized by large flow volumes with high organic loading, suspended solids, and dissolved inorganic impurities.  This wastewater requires multiple treatment steps.  ST+ and ST++ modules are excellent choices to drive concentration up and the cost of evaporation down.

Effluent Treatment Performance

Performance Estimate

Based on a typical CTX wastewater stream, we’ve estimated the permeate quality following a single stage of ST+ modules.  

Performance in the Field

AquaZoom RO technology is installed in one site operating on CTX wastewater.  This installation uses up to 200 of our ST++ modules.  We are in the process of getting operating data for inclusion on our website.

Flue Gas Desulfurization (FGD)

FGD is Key to Coal-Fired Power Generation

Wet Flue Gas Desulfurization (FGD) is a process by which coal-fired power plants remove sulphur dioxide (SO2) before emitting their flue gas into the atmosphere. The water intensive scrubbing process requires a durable treatment technology as FGD blowdown wastewaters are highly contaminanted.

Highly Contaminated Wastewater

FGD scrubber liquor has very high levels of chlorides (4,000 – 25,000 mg/L), trace concentrations of heavy metals (e.g., chromium, mercury, and selenium), high levels of nitrates (10-700 mg/L) and very high levels of total dissolved solids (15,000 to 60,000 mg/L).   

Typical FGD Wastewater

Difficult Composition

Effluent is particularly contaminated with suspended solids, chlorides, and organics

Effects on Process

Treatment of complex, high TDS wastewater will result in more processes and require more durable materials of construction.

Treatment Process

Multiple Unit Operations

Conventional processes, like coagulation/flocculation, softening and ultrafiltration are used as pre-treatment to the RO in order to achieve Zero Liquid Discharge.  

AquaZoom RO Enhances Process

Our AquaZoom™ ST+ or DTG modules can be used to desalinate the wastewater and cost effectively reduce the volume prior to evaporation. A typical FGD water treatment process is illustrated to the right.

AquaZoom RO Modules for Large Flows

As a large membrane area solution for high-volume applications, the ST+ and ST++ modules can be used to significantly reduce treatment plant footprint and overall CAPEX.  

Offshore Marine Applications

Offshore Seawater Desalination

AquaZoom™ DT and ST module technology has been used for seawater desalination on offshore vessels and platforms for over 30 years, including 60 installations over the past 10 years.  

Great Fit for Application

Simple operation, long membrane lifetime, and limited feed pretreatment requirements due to their unique feed side module construction makes them the desalination technology of choice for many offshore marine operators.  

New Build or Retrofit

We can supply you with new modules or can retrofit your current ones with new membrane elements.  Just give us a call or send us an email so we can assist you with your project.