Salher studies, designs and manufactures secondary treatments with several configurations to propose the most suitable treatment plants for each need.
WWTP by activated sludge
The low-load activated sludge treatment plant (extended aeration) with high-efficiency fixed culture CVC-OXIDEP-TC is usually used to treat the water of small towns and is certified according to EN 12566-3 Standard.
This equipment manufactured in GFRP has a system of oxygen supply and equalization of the mixed liquor through a compressor and a fine bubble diffusers grid in EPDM, a fixed bed of plastic material, for fixation and growth of the biomass, a recirculation system of activated sludge through Airlift and a truncated cone shape settler with central supply and Thompson perimeter canal. The CHC-OXIDEP model is exactly the same, but does not include the truncated shape settler.
The low-load activated sludge treatment plant (extended aeration) with fixed culture and primary settling chamber CHC-FS-OXIDEP is usually used to treat the water issued from small populations. It includes a primary settling chamber for equalization of the flow and the elimination of coarse solids. This GFRP equipment has an oxygen supply system and an equalization of the mixed liquor through a compressor and a fine bubble diffusers grid in EPDM, a fixed bed of plastic material, for fixation and growth of the biomass, a system of recirculation of activated sludge through Airlift and a secondary settling tank.
The electrical panel board is an optional element, consult our experts for more information about options and accessories.
The treatment plant for low-load activated sludge (extended aeration) with settling tank, compressor, diffuser grid and sludge recirculation system CHC-OXIREC-C is used to treat water of medium and large populations, to remove 80% to 90% organic matter (BOD5). This equipment in GFRP includes a system of oxygen supply and equalization of the mixed liquor through compressor and grid of fine bubble diffusers in EPDM, a compact settling tank and an activated sludge recirculation system through submerged pump. It includes an electrical panel board for electromechanical protection and programming.
The treatment plant by low-load activated sludge (extended aeration) with truncated shape settling tank, compressor, fine bubble diffusers grid and sludge recirculation system CHC-OXI-REC-DEC is almost the same than the previous one, but for a higher organic matter removal (BOD5 ≥ 90 – 95%). It is achieved with the incorporation of a truncated cone shape settling tank with central feeding and Thompson perimeter canal.
The nitrification-denitrification treatment plants are secondary treatments by low-load activated sludge, with biological nitrogen removal (nitrification-denitrification) and clarification process. Optionally, a phosphorus removal system is available.
We find two models that differ from each other in the clarification process: the CHC-OXI-REC-C-ANOX treatment plant carries out its clarification process in a secondary compact settling tank and the CHC-OXI-REC-DEC-ANOX in an independent truncated shape cone settling tank.
Both are manufactured in GFRP and remove the organic matter (BOD5 ≥ 90 – 95%) and nitrogen and phosphorus. Their internal layout, except the clarification process part, consists of an anoxic chamber through a submerged agitator with a discharge kit, a system for oxygen supply and equalization of the mixed liquor in an aerobic chamber through a compressor and fine bubble EPDM diffusers grid and an internal and external recirculation system through submerged pump and discharge kit. It includes a panel board for protection and programming of electromechanical equipment.
WWTP by moving bed biofilm reactor (MBBR)
Salher biological treatments for the removal of organic matter by moving bed biofilm reactor (MBBR) consist in reactor with cylindrical shape and horizontal or vertical design in GFRP.
The technology used is a biological treatment where the biomass is fixed and grows adhered to mobile supports, under appropriate conditions of agitation and oxidation. The supports are made of plastic material, with a high specific surface area (> 500 m²/m³) with density close to 1g / cm³. This technology has the many advantages over the process of low-load activated sludge:
- Great stability of organic matter degradation processes.
- Reduction of the biological reactor volume for same quality effluent.
- Dimensioning of reactors with flexible volumes and filling material depending on the performance required and the current – future loads.
- High flexibility to face pollutant peak loads and presence of inhibitors, restoring the process in just a few hours.
- Facilitates secondary settling and no recirculation is required to keep the bacterial population, facilitating the absence of filamentous bulking. Possibility of working with higher ascending speeds.
- Easy control and operation conditions.
The reactor will have different chamber layouts and filling materials according to the requirements of the quality of the effluent, pollutant loads and treatment flows:
- Settling chambers: simple settling or settling – digestion (Imhoff).
- Different aeration chambers: aerobic elimination of COD and aerobic of nitrification.
- Specific plastic filler for different aeration chambers.
The air distribution system is made of a fine bubble diffusers grid, placed at the bottom of the biological reactor to optimize the aeration and agitation processes.
The communication between compartments is carried out by means of an effective system, which prevents from the fixing and exit of the plastic filling material.
The secondary settling is carried out in a secondary clarifier, Salher brand, with a compact shape to the reactor or truncated cone shaped, for the physical phenomenon of settling. It will be manufactured in GFRP and include a central feeding and Thompson perimeter canal with clarified liquid collection channel.
The control of the plant is performed by a panel board to protect and control the different components of the WWTP.
Optionally, the plant can be supplied with a dissolved oxygen meter.
WWTP by moving bed biofilm reactor, nitrogen removal and phosphorus:
CHC-FS-BIO-DEP, CHC-FS-BIO-DEP-ANOX, CHC-BIO-C, CHC-BIO-TC, CHC-FS-BIO-C, CHC-FS-BIO-TC, CHC-ANOX-BIO-C, CHC-ANOX-BIO-TC, CHC-FS-ANOX-BIO-C and CHC-FS-ANOX-BIO-TC.
Please consult our engineers for any general or specific questions about this equipment or other water treatment solutions.
WWTP with biomembranes (MBR)
The treatment plant with biomembranes CHC-OXI-MBR is a secondary treatment by means of membrane bioreactor (MBR), optionally with biological nitrogen elimination (nitrification-denitrification). This biological treatment with separation of biomass from clarified water is carried out by ultrafiltration membranes at atmospheric pressure (nominal pore diameter <0.1 μm).
The CHC-OXI-MBR achieves high yields in the removal of organic matter, suspended solids and ammonium (BOD5: 99%, COD: 95%, N-NH4 +: 82%, SST: 99%, fecal coliforms: 99.9%). It is composed of Salher equipment manufactured in GFRP certified by an external body, with strict quality controls in its production process, which are also compact, modular, highly efficiency and easy to install and commission.
The advantages of these treatment plants compared to others equipment, Salher brand, are:
- Exceptional quality of the effluent. Water quality for water reuse, according to regulation RD1620 / 2007. Effluent 100% free of viruses, bacteria and other pathogens.
- Reduction of the necessary area compared to traditional technologies: 65 – 75%. Elimination of the secondary settling tank and reduction of the volume of the biological reactor.
- Substitution of the secondary decanter by ultrafiltration membranes. Technology with perfect separation of clarified water and sludge (liquid fraction of mixed liquor). Elimination of problems associated with the settling of sludge.
- Greater flexibility to face peak flows and contaminating loads.
- Absence of odors. No bulking problems.
- Lower production and greater stabilization of sludge. Increase of sludge ages and decrease of mass loads.
- High degree of automation.
- Possibility of direct reuse for irrigation and other applications.
The elements included in the bio membrane treatment plant CHC-OXI-MBR are:
- The MBR, consisting of a set of rack-mounted ultrafiltration modules with diffusers grid and permeate outlet manifold and with two (1 + 1) permeate suction pumps. In addition, it includes a membrane cleaning system.
- The biological reactor, is a vertical GFRP tank that consists of 2 (1 + 1) compressors / rotary piston blower with sou ndproofing cabin, a diffusers grid, a feed pump to the MBR for recirculation and a pump sludge extraction.
- Electrical panel board + automaton.
- Supervision of the installation and commissioning in national territory.
- Documentation: plans, manuals and certificates.
The treatment can also be provided by means of membrane bioreactors (MBR), in civil works, with separate equipment and projects. We refer to our OXI-MBR reference, which has exactly the same advantages and features as the compact wastewater treatment option, but also includes the design and project of the necessary civil works, technical advice on site, with optional work management and the commissioning to adjust the Salher equipment.
WWTP by biological filter
The WWTP by biological filter or trickling filter IMH-LBR-TC is a GFRP equipment with orthophthalic resins for removal of 85 – 90% organic matter (BOD5) and 90% suspended solids (SS).
These sewage treatment plants include a primary treatment through settling – digestion (Imhoff tank) and a secondary treatment through recirculated biological filter with feed through a mobile distributor (rotating arm), lower part evacuation system and natural ventilation. The filling material is plastic with a high hollows ratio (95%) and a high specific surface area (140 m²/m³). The pumping station to the biological filter incorporates a pump with level regulation system.
Additionally, this treatment plant includes a truncated cone shape secondary settling tank with central feed and Thompson perimeter canal, a sludge extraction system to the digestion chamber of the Imhoff tank consisting of a submersible pump with extraction system through auto-coupling and a recirculation system of part or total of the treated water to increase the system performance.
On the other hand, the vertical treatment plant with settling – digestion chambers, biological filter and grease chamber CVC-D is a GFRP equipment with orthophthalic resins for the elimination of 70 – 80% of organic matter (BOD5) and 65 – 70% suspended solids (SS). This set of treatments includes settling, digestion, biological filter and separation of floats with a plastic filling material with a high hollows rate (95%) and a high specific surface area (140 m²/m³).
The horizontal treatment plant with settling – digestion chambers and trickling filter CHC-D is a GFRP equipment with orthophthalic resins for the elimination of 70 – 80% of organic matter (BOD5) and 65 – 70% solids in suspension (SS). It includes a primary treatment through settling-digestion, a secondary treatment through trickling filter with a plastic filling material with a high hollows rate (95%) and a high specific surface area (140 m²/m³).
Among our WWTP by biological filter, we have the horizontal treatment plant with settling – digestion chambers, trickling filter and a secondary decanter CHCD-D, a GFRP equipment with orthophthalic resins for the removal of 80% of solids in suspension and of 70-80 % of organic matter (BOD5). This depuration option contains a primary treatment by decanting – digestion, a secondary treatment by biological filter, a compact secondary decanter, all with plastic filler material with a high hole index (95%) and a high specific surface area (140 m2 / m3).
Finally, the biological filter or trickling filter with reference CVC-FB is a GFRP equipment with orthophthalic resins used for the elimination of 80-90% of organic material BOD5. Inside, a secondary treatment is enclosed through trickling filter with a plastic filling material with a high hollows rate (95%) and a high specific surface area (140 m²/m³).
Specific treatment plants
In Salher we develop customized solutions to cover all the needs of our clients. Therefore, we design and manufacture portable and containerized treatment plants and modular treatment plants with plate tanks.
The first are fully compact portable and containerized treatment plants to be installed above-ground or underground for easy transport and installation. They are designed and manufactured by Salher for the elimination of organic matter (BOD5) when a standard installation of the water plant is not possible. They are equipment manufactured in GFRP with orthophthalic resins and are standardized in 20’ or 40’ containers. Salher treatment systems can be installed inside: low load activated sludge, moving bed biofilm reactor or biomembranes. In addition, they include the possibility of housing a technical compartment for electrical panel and machinery.
The modular treatment plants with plate tanks are used in the treatment of urban and industrial wastewater for large flows. They are mixed treatment systems consisting of modular tanks composed of plates of high mechanical and chemical resistance, easy to transport and install anywhere in the world thanks to their modularity. When this type of treatment plant is required, Salher also offers engineering design, installation and construction management.
Please consult our engineers for any general or specific question about this equipment or other water treatment solutions.
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