PWL - Screenings Presses and Screenings Washers
For the screenings presses and screenings washers from PWL Anlagentechnik, the experience that the PWL team has built up over decades in the treatment of screenings has been consistently put into practice. This reduces the weight of the screenings by an average of 75%, which is impressively demonstrated by numerous reference systems. During development, a special focus was placed on the lowest possible wear and tear and high operational reliability. The screenings washing IWV (interval washing compressor) can also be operated with process water from the sand trap area. Even large batches of screenings, such as those that occur in rainy weather, are pushed through without problems.
The PWL interval washing compactor IWV ensures intensive dewatering and washing of screenings and does not require any agitator or shredding of the screenings. Transport and compaction are ensured by a massive conveyor spiral, which is provided with an inner tube. This spiral is mounted in the drive via a coupling piece and is additionally centered by the extended inner tube in the screenings plug on the press zone side. This eliminates the possibility of the spiral dragging on the bottom of the screen.
The washing water can be supplied in two different ways: on the one hand by process water, on the other hand by a waste water pump installed on site in the sand trap. Washing with waste water – a truly sustainable method.
An automatic rinsing device with two solenoid valves or electric ball valves for the washing and pressing area and the drain pan is used for washing the screenings and cleaning the machine. However, if a waste water pump is used, the fittings are not required.
The rake ejects the screenings directly or via a conveyor into the hopper of the washer. After being pre-pressed by the conveyor spiral, it reaches the washing chamber, where it is washed in the water flow – without any mechanical action whatsoever. Following the washing process, the screenings enter the press zone. Here it is compressed and discharged. All soluble organic substances are fed back into the channel together with the washing water. The discharge pipe of the screenings press has an integrated press zone adjustment and can optionally be equipped with a hygienic enclosure.
The different types of our IWV screenings washers had a throughput of 0.5 to 9 cubic meters per hour. The materials 1.4301 (V2A) and 1.4571 (V4A) are used for their production. The user benefits from a brushless and self-cleaning mode of operation with high energy efficiency at the same time. Due to the special two-point bearing, wear is kept to a minimum, and the replaceable sieve decks also ensure high flexibility. The drain pan is also designed to ensure optimal accessibility. Further individual leeway is given by manually influencing the pressing result, and the screenings do not necessarily have to be reduced in size. A secondary load from fibers and plastic particles can thus be avoided.
- Throughput: 0.5 to 9 m³/h
- Materials: 1.4301 (V2A) and 1.4571 (V4A)
- self-cleaning operation
- minimal wear thanks to two-point bearing
- high energy efficiency
- replaceable sieve trays
- Drain pan with optimal accessibility
- manual influencing of the pressing result
- no secondary exposure to plastic particles
In the press and washing water area of the screenings press there is a specially slotted sieve floor, which ensures good water drainage. This floor can also be replaced by loosening screw connections if necessary. The compacted material is discharged via a friction tube. The discharge tube has a press zone narrowing that can be operated manually. The press water is returned from the drain pan via a separate pipeline. The drain pan has a separate flushing device and can be viewed through lockable hand holes.
The fields of application are as varied as the individual setting options of the screenings press IWV. For example, the press is used in municipal sewage treatment plants and various fine and coarse screening plants. Furthermore, in this context, industrial plants for waste water treatment and various disposal and recycling companies should be mentioned, in which the screenings washing does its job reliably. Other areas of application include the dewatering of residues and accepts as well as the beverage and brewery industry. The numerous possible uses of the presses are rounded off by their function as a supplement to the drum and curved screens from PWL.
PWL GmbH & Co. Anlagentechnik KG designs various systems and machines for use in municipal sewage treatment plants or various industrial sectors. A comprehensive application-related know-how forms the basis. The basic prerequisite for efficient and customer-specific solutions is the structural configuration and adaptation of the machines to the individual operating conditions that are found on site at the respective user. The choice of a suitable process technology for the separation process of the dirty water as well as a possible recycling and further treatment of accepts is important special attention was paid to this.
With products from PWL, such as coarse or fine screens, both the technical and the economic efficiency of sewage treatment plants can be significantly increased. The company`s drum filters and screens are mainly used in the industrial sector. The various screening machines ensure a high level of effectiveness and reliability in process water treatment and waste water treatment. The selection of products is supplemented by, among other things, curved screens for fine screening of waste and process water or the screenings press described in detail above. The screw and spiral presses from PWL, some of which have a special washing function, are used to collect screening residue and screenings in waste water systems and production processes. The company also sells spiral conveyors for the reliable, hygienic and space-saving transport of good and residual materials. Sewer grit receiving stations, grit washers and various grit washing systems round off the delivery program of PWL Anlagentechnik for mechanical waste water treatment. A wide range of possible applications - such as solid-liquid separation, sand trap and sedimentation systems, drainage systems and many more - are covered by the comprehensive range.