Solid-Liquid separation
About us Haase Abwassertechnik GmbH & Co. KG, based in Troisdorf, Germany, is a young and innovative company whose main focus is waste water purification and solid-liquid separation. As a manufacturer of customised and standardised screens for the mechanical solids-liquid separation, we specialise in the following services: Planning, design and production of customised hydro bow screens in various materials and types Planning and production of specially developed rake screens Screw compactors for post-dewatering of screenings Rotary filter for finest separation of emulsions Advice and support in all areas of wastewater treatment Our devices are efficient, self-cleaning, low maintenance and low wear. Operating error is virtually impossible. They have proved to be successful in a variety of applications in the industrial and municipal area: Waste water purification Resource recovery Water recycling Within the, the brand stands for the business sectors environmental technology, wastewater purification and solid-liquid separation. As part of the, Haase Abwassertechnik GmbH & Co. KG is in a position to offer customers and interested parties advice and solutions in the areas of energy, water and environment over and above its own products and services. Take advantage of our long and varied experience in solid-liquid separation and the high efficiency of our devices. They are ideal for a broad spectrum of applications, ranging from separation of faeces, filtration of ion exchange resin from suspensions, all the way to separation of fine particles from rocket fuel. Your Haase Wastewater Technology Team
Content Hydro bow screens Screen plates Open bow screens Covered bow screens Special designs Fine rake screens and rake cleaners Rotary filters Screw compactors References 3 4 5 6 7 8 9 9 10
Hydro bow screens Hydro bow screens are used for the treatment of process water. Bow screens are particularly suitable for complex and complicated separation processes such as waste oil prior to burning, as fine filter in wastewater purification prior to biological treatment, and in industrial wastewater treatment plants. Industrial enterprises such as the food and beverage industry benefit from our products, since the process water circulates in a sealed system and can be reused several times. Bow screens separate all fibres and lint in textile finishing plants, laundries and cotton bleacheries. The feed suspension is accelerated and fed crosswise to slot direction and tangentially to curved screen plate. The acceleration creates centrifugal forces which move the heavy solid particles away from the bow screen. This way the water can be discharged through the screen plate, separating the solids. Our bow screens are robust, lowmaintenance, self-cleaning and made entirely of stainless steel. The specially developed high-performance screen plates used by us allow a space-saving construction of the device. Hydro bow screens replace complex and expensive screening machines and systems, e.g. in the areas: Filtration, separation, purification, raking, thickening, recovery, classification, drainage. Depending on type of device, capacities up to 250 m3/h are possible. Solids (pollutants) of up to 90 μm can easily be separated. This grade of filtration ensures that the filtered process water can even be fed to heat exchangers for energy recovery without any problems. Thanks to the possibility of also achieving optimal performance in gravity flow, they offer the best conditions for efficient use in the area of pretreatment, as well as in various production processes. 3
Screen plates Many years of tests resulted in the development of screen plates that are particularly well suited for application in our products. They are reflected in all our products in form of welded wedge wire screens. The hydraulic performance of the screen plates depends on the slot distance and the quality of the feed suspension. The crucial difference here is viscosity and temperature of the pumped medium, as well as shape, volume and consistency of the solid particles contained therein. As with all static filters, the separation size depends on the filter cleaning. The size of the flow-through opening is increased by the triangular profile shape; this prevents twisting and creates a selfcleaning effect. Our separation systems can separate particles that are significantly smaller than the slot distance. This is due to the special inclined position of the profiles and the optimal screen plate radius tried and tested in numerous trials. The screen plate consists of stainless steel grade 1.4435, which not only ensures an excellent wear protection, but also acid and alkali resistance. The special high-performance screen plates can be retrofitted with slot distances of: 0.2 / 0.3 / 0.5 / 1.0 / 1.25 / 1.5 / 2.0 / 3.0 mm. If these slot distances do not produce the desired cleaning effect, customised solutions are available. The bow screen housing and the corresponding screen plate are calculated, designed and produced by our staff according to our clients needs. We attach great importance to ensuring that every special requirement is included in the planning process. 4
Open bow screens The BS type of our bow screens is one of the most frequently used housing models. The inlet and outlet can be placed at any position on the housing; thanks to the different combination possibilities of the connection types, this design allows a variety of applications. In contrast to the BS type, the BSL type is longer. This is particularly important in case of confined spaces to ensure a uniform filter area. Our housings of the BSX type are made of high-grade plastic. This is a very lightweight design, characterised by a low overall height. Thus, they are suitable for crate washing machines and applications with limited set-up space. If required, all bow screen types can be made of PE-HWU. This material is characterised by excellent heat resistance up to 80 C. In addition, it is resistant to acids and bases, which makes it particularly suitable for application in the chemical and petrochemical industry. The hydro bow screens are available in the following standard widths: 500-750-1000-1250-1500-1750-2000 mm. However, special designs can be realised in any shape and size. Standard Special Description A B C BS 970 1230 180 BSL 1200 1600 180 BSX 650 900 130 Dimension (mm) 5
Covered bow screens The BSA type is completely covered. It is equipped with a movable cover in the screen plate area. The cover is hinged at the housing and easy to operate via the lever and the lockable pneumatic springs. It serves mainly as splash protection and aesthetics of the bow screen; it can also be equipped with an inspection glass. In addition, the integrated, removable solids container offers the possibility of postdewatering of the screening material. The screen plate as well as the solids container are integrated in the housing and covered. Same as in case of open bow screens, our BSAZ type offers a space-saving alternative that combines a large filter area and low space requirement with the benefits of a covered curved screen. The bow screens made of plastic can also be equipped with a cover and removable solid container. Due to the low material-specific weight of PE-HWU, the BSAK type is supplied without pneumatic springs. The cover is removable and can be made entirely of transparent plastic. The hydro bow screens are available in the following standard widths: 500-750-1000-1250-1500-1750-2000 mm. However, special designs can be realised in any shape and size. Description A B BSA 1240 1640 BSAZ 1500 2000 BSAK 820 1180 Dimension (mm) 6
Special designs In special cases we also equip our hydro bow screens with a specifically developed screen plate cleaning. The nozzle arm with flat jet nozzles located above the screen plate ensures a trouble-free and unattended operation. An automatic control allows random setting of cleaning cycles and cleaning duration, depending on quality of suspension to be cleaned. On our vibrating bow screens the solids movement is supported by a dynamic guide plate. Due to the vibration, the risk of clogging in case of very small slot distances of the screen plates is avoided. This means separation of more, as well as smaller, solids. They are also ideal as preliminary stage for membrane cleaning in terms of reliability and prolonged service life. A gas-tight version of our hydro bow screen was developed for the filtration of odorous suspensions. It comes with a cover that is attached to the housing frame at several places in a gas-tight manner. In addition, the bow screen is sealed in such a way that it can compensate even overpressure during the production process. All our devices are also available with automatic solids extraction. For this purpose several devices can be set up in a row, for instance, and the solids extraction be performed via a spiral conveyor. Furthermore, the solids can be transported to lower-lying locations in the plant via discharge chute for subsequent use. 7
Fine rake screen Contrary to other products, our fine rake screens are used in areas in which the flow direction of the volume flow to be filtered is not diverted. In municipal and industrial wastewater treatment plants, in waste treatment and resource recovery, rakes are an indispensible separation tool during the production cycle. Our fine rake screens are available in various designs. We offer variants with screen belt, rake cleaners with spring loaded screen plate and expansion to coarse rakes available on site. The use of high-quality stainless steel and plastic materials ensures high corrosion resistance and permanent availability of the screens. Low maintenance, easy accessibility of the components, low energy requirement and easy handling guarantee the cost-efficient operation of the rakes in all plants. A high level of solid separation in the medium to be cleaned is achieved even at angles of attack up to 60 degrees. Our fine rake screens are available in widths of 400-1500 mm and slot widths of 0.6 to 15 mm. 8
Screw compactors screw compactor is The the aggregate for post-dewatering and compaction of residues from wastewater or process water cleaning. This includes in particular the screened and raked material from mechanical wastewater purification of coarse and fine rakes, drum screens or curved screens. The application ranges from municipal wastewater treatment plants all the way to wine-making. These screw compactors are used especially for residue dewatering in the paper industry, wood or food processing sectors. screw compactor The consists of a stainless steel trough with input shaft and recessed drainage zone. In addition, it is equipped with a shaftless carbon spiral specifically developed for heavy-duty application. To increase the degree of dewatering, the screw compactor is also equipped with a specially developed and patented discharge plate, in addition to the dewatering module. screw compactor The three most important functions of the are transporting, dewatering and compacting. Rotary filters Rotary filters are ideal for filtering very small particles such as algae, organic materials and microorganism from rivers, lakes and rainwater. Featuring a hydraulic motor, they are suitable for installation in places without electrical connection. This requires only a pre-pressure of 1.5 bar. Upon request they are also available with electrical motor. Backwash clean water Inlet 9 Outlet
References Coca Cola GmbH Pre-cleaning for a biological wastewater treatment plant Robert Bosch GmbH Cleaning of industrial wastewater BASF SE Separation of solids from poly boiler cleaning water C. Thywissen GmbH Separation of solids from oily suspension Evonik Industries AG (Degussa-Hüls) Pre-cleaning for biological wastewater treatment plant Siepmann-Werke GmbH & Co.KG Separation of scale from circulating water Nestlé Deutschland AG Separation of coffee particles from caustic soda Iglo GmbH Separation of spinach leaves from circulating water City of Kassel Water recycling for waste container washing area Green Energy Verwaltungsgesellschaft mbh Separation of solids from biomass fermentation Lyondell Basell AG Separation of rubber particles from process water Borealis Polymere GmbH Separation of plastic particles from process water Slaughterhouse Jakarta (Indonesia) Separation of animal remains from process water LyondellBasell AG (Espania) Cleaning of process water Anders & Steen Hansen I/S (Denmark) Separation of food scraps from circulating water Machland Feinkost-Konserven GmbH (Austria) Separation of food scraps from circulating water Jungbunzlauer Austria AG (Austria) Separation of resin from circulating water 10
Haase Abwassertechnik GmbH & Co. KG Josef-Kitz-Straße 18a 53840 Troisdorf Germany Tel.: +49 2241 25440 10 Fax: +49 2241 25440 25 mail: info@haase-abwassertechnik.de www.haase-abwassertechnik.de Subject to errors and technical modifications. Reprint and duplication, including excerpts, only permitted after approval. We accept no liability for printing errors. Our general terms and conditions apply.