DIRECT-RO: Reverse Osmosis for Leachate Treatment
All on-board packaged plants: containerized Reverse Osmosis systems for quick start-up
Typically, leachate from waste treatment, landfills and landfill lagoons is heavily contaminated with organic substances (BOD, COD), nitrogen (mostly ammonia and organically bound nitrogen), heavy metals and salts. Since these compounds have some negative impact on the environment, the leachate needs to be treated before it can be discharged to a water body or the sewers.
A Reverse Osmosis is a basic treatment technology for treating such leachate, used in countless landfills all over the world.
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Description of the product
The WEHRLE Direct-RO is a standardized and containerized Reverse Osmosis system for treating leachate directly from the lagoon or landfill. The Direct-RO is designed aiming at compactness, user comfortability and simplicity of the operation as well as the installation.
The Direct-RO is available in three different sizes (S, M or XL) that cover an inlet flow range up to 260 m³/d. Depending on the leachate characteristics and the required discharge quality, 2- or 3-step versions can be selected. With a variety of optional packages, the Direct-RO can be configured to the local needs.
The Direct-RO operates with organic spiral wound (SW) membrane modules in a Feed & Bleed configuration at a pressure of 80 bar. The system has been designed in a way that a possible later upgrade to a WEHRLE BIOMEMBRAT® MBR is possible. This may be an option if e.g. ammonia values exceed normal parameters.
Further variations, plant sizes or features are available on request.
Features
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Highly flexible 80 bar RO system for variable flow rates and high permeate yield
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High quality materials and components from brand manufacturers
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On-board sand filter unit with automated backwashing
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On-board influent pH adjustment system with antifoam control
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Chemically enhanced CIP (“Cleaning-in-place”) system
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PLC-automated process control equipped HMI with remote access function
Technical details
WEHRLE uses selected materials and components suitable to the application from well-known suppliers. The Direct-RO will be delivered as a standard 40’ container(s), equipped with automatization and process control and comes pre-commissioned and tested in our factory.
Container Color: | RAL 7035 |
Pressure: | 80 bar |
Membranes: |
organic, spiral wound, 8” modules |
Sub-systems: |
automatic pH adjustment, foam control, CIP, automatic sand filter |
Measured data (online): |
pH, conductivity, temperature, pressure, flow |
PLC: |
Siemens S7 |
Operation / HMI: |
Siemens touch panel with graphical user interface |
Remote processing: |
optional, with LAN |
Safety equipment: |
mobile eye shower |
Sulfuric acid storage: |
S, XL: inside or outside, M: outside only |
Leachate treatment with WEHRLE Direct Reverse Osmosis
WEHRLE uses Spiral Wound (SW) membranes:
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Space-saving due to horizontal construction and high membrane surface. This allows to fit 3 RO steps within one container.
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With 80 bar process pressure, standard equipment & piping can be used. This reduces the plant operation costs, especially for membrane replacement.
- The Feed & Bleed configuration allows to vary the flow rate.
Membrane lifetime expectancies:
1st step: 1 … 2 years, 2nd/3rd step: 3 … 4 years.
Available plant sizes
Depending on the flow rate that needs to be treated, there are three different plant sizes of the WEHRLE Direct-RO: the S, M and XL plants, which cover a wide range of flow rates.
S / M: 1 container 40‘ XL: 2 containers 40‘
*) the higher level (COD or TDS) determines the working point
Recovery rate
Depending on the required rejection rate and the expected inlet TDS concentration, a configuration with 2 or 3 steps can be selected.
The following table shows an overview of the retention rates for Chemical Oxygen Demand (COD), Ammonium (NH4-N) and Total Dissolved Solids (TDS) achieved with a 2 and 3 Direct-RO plant:
Retention rates |
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Model Selection Steps |
COD |
NH4-N |
TDS |
2-step
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99 % |
98 % |
99% |
3-step
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99.9 % |
99.7 % |
99.9% |
Packages/ Options
The Direct-RO meets and adapts to the clients demands by customizing the plant selecting the required Options / Packages.
This provides a finalized and complete design able to be delivered in a much shorter time.
Advanced Automation Package containing |
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OPEX Reduction Package containing |
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Hazardous Environment Package containing |
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Hot Climate Package for average daily ambient temperatures > 20 °C containing |
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Cold Climate Package for average daily ambient temperatures < 0 °C containing |
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Basic Chemicals Package (within E.U. only) containing |
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2-year Spares Package containing |
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Extended Warranty Package (only in combination with 2-year Spares Package) |
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CSC Certification for overseas shipments |