Belt Filter (BF)
When treating process and wastewater, mechanical filtration represents an efficient, economical and environmentally friendly method of solids removal. The MP-BF Belt Filter has high applicability with some examples given below:
Municipal wastewater treatment plants
Filtering requirements for wastewater are dependant on the actual stage of the treatment process. The Belt Filters are available with various sizes of belt openings:
- Inlet screening (1000 – 5000μm)
- Primary treatment (100 – 500μm)
- Polishing (40 – 60μm)
Removal of solids at wastewater treatment plants to enhance further treatment. Solids usually suitable for biogas.
Removal of solids within the process line:
- fruits & vegetable processing
Pre-treatment of surface water to prevent unintended discharge to sewer. Filtration of recirculated liquids for removal of solids.
- Waste treatment stations
- Zoo and nature parks
Onshore & offshore fish farms and recirculated aquaculture systems use belt filters for:
- pre-treatment or primary filtration
- sludge thickening/dewatering
- concentration of backwash from drum filters
In some cases, using a MP-BF Belt Filter with combined chemical and mechanical filtration is required to achieve the discharge consent.
The MP-BF Belt Filters are available in several standard models dependant on application, flow and available space. Multiple belt filters are installed for larger flows.
All models are based on the same design concept, this makes all models equal in terms of efficiency, reliability and applicability.
An internal drum motor ensures a compact design, long operational lifetime and low power consumption, available with two fixed speeds. Optionally, a frequency controlled belt filter with automatic start/stop gives better and more efficient solid filtration
The smallest model is designated l.3C and the largest model 3.6M. The maximum flow per belt filter depends on application and choice of filter mesh openings. The length -of the belt filter affects both flow capacity and dewatering efficiency.
The capacity also depends on the concentration of suspended solids. A preliminary estimation for MP-BF-3.GM with 150 μm filtration is maximum 80 m3/h and with 5000 μm filtration maximum 800 m3/h.
Belt filter mesh is chosen based on filtering requirements. MP-BF Belt Filter mesh is available in range from 40 μm to 5000 μm. The high quality polyester fibres are used to produce filter belt mesh. The belts are woven with different patterns and openings which determines the filtering efficiency and flow capacity. The design gives important properties such as dimensional stability, anti-corrosion and a long service life.
MP-BF Belt Filters are equipped with a static scraper or optional rotary scraper to ensure proper discharge of sludge and solids. Choice of scraper depends on belt filter application and belt filter
mesh openings. The rotary scraper is designed with a drum motor to sustain the compact belt filter design.
Belt Spray Cleaning
Belt filter cleaning is crucial for continuous efficient filtering. Spray cleaning with filtered water and/or clean water are the most common. Nozzles are installed with quick-release functionality for
easier maintenance. The belt filters are delivered with one spraying bar and is prepared for one extra optional spraying bar.
Separate outlet for spray water is the most common setup to avoid reduction in sludge dry matter.
Belt cleaning using water is economical due to low cost of electricity, compared to cleaning with air knifes for example. The spray water also contains the particles which provides a healthier working environment compared to using compressed air cleaning.