WO2017039469A1

WO2017039469A1 - Biological filter curtain

Info

Publication number: WO2017039469A1
Application number: PCT/PL2015/050047
Authority: WO
Inventors: Adam MASŁOŃ
Original assignee: Politechnika Rzeszowska
Priority date: 2015-09-01
Filing date: 2015-09-23
Publication date: 2017-03-09
Also published as: PL413781A1

Abstract

The curtain biological filter includes immobilized biomass also called a biofilm, developed on the vertical surface of a loosely falling partition made of plastic, favorably in the form of ropes (1). The ropes (1) are fiber ropes of plastic, favorably of polypropylene and/or nylon and/or polyethylene with gauge from 5 to 50 mm. The ropes (1) are arranged at a distance from 1 d to 10 d, where d means the rope's diameter. The rope (1) used for making a curtain may have the form of a twisted or braided rope. The curtain for settlement of immobilized biomass is placed in a steel frame (2) of acid-resistant steel. In turn the steel frame (2) is placed in guides (3) resistant to corrosion caused by water or wastewater fixed inside the tank (4) for treatment of water or wastewater.

Description

BIOLOGICAL FILTER CURTAIN

The subject of the invention includes a biological filter in the form of a loose vertical curtain made of synthetic fiber ropes on the surface of which there is development of immobilized biomass, intended for biological treatment of water or wastewater. Wastewater is biologically treated first of all in systems with biomass in suspension state called activated sludge or attached to the carrying basis called a biofilm. It is also possible to treat wastewater in hybrid units forming the connection of a biofilm and activated sludge i.e. suspended biomass and fixed to carriers in one reactor in the form of a biological filter.

The advantage of the hybrid systems - combining features of an activated sludge and biofilm is the possibility of collection of much larger pollution loads in comparison with an analogous volume of a typical activated sludge reactor. Achievement of high concentration of biomass thanks to its retention on carriers increases stability of biological treatment of wastewater and elasticity in reference to changeable pollution loads flowing to the system. In addition, reactors with an activated sludge and biofilm show high tolerance of pH and temperature fluctuations as well as content of toxic substances. Application of additional biomass in the form of a biofilm is of large significance in case of modernization of existing units, often hydraulically overloaded or with low effectiveness of biological treatment of wastewater. Improvement of efficiency of treatment concerns introduction of an appropriate basis into the tank of activated sludge for development of micro-organisms in the form of carriers for a biofilm.

The key factor for proper and stable development of micro-organisms of the biofilm is the basis which should ensure appropriate area of contact of microorganisms with substances removed from wastewater. Effectiveness of development of appropriate population of micro-organisms in the biofilm depends on the kind of carrier for immobilized biomass.

There are also known different types of systems combining the technology of activated sludge and biological filter. There are known different solutions concerning biological filters applied for biological treatment of wastewater or water.

The patent description No. PL 144779 shows an immersed biological filter built in the form of a rotating drum with filling.

The patent No. PL 1 10701 shows the way of introducing a grained carried into the tank on which biomass develops in the quantity of at least 1% of the capacity of the tank.

The patent description No. PL 107006 shows the way of biological treatment and additional treatment of wastewater, watercourses, water conditioning with the use of pierced screens on which epiphyte organisms develop.

Description of the industrial model PL17914 presents a flow-through filter in the form of a stylized cuboid with characteristic grating outline of frontal and side surfaces, including horizontally a number of parallel elements in the form of strips possessing on ends openings creating one or two of three of four or five or six or seven of eight of nine of ten layers whose longitudinal frontal edges possess symmetrically placed diagonal grooves which on opposite edges are shifted mutually by half of their length in which vertical elements are in parallel introduced in the form of strips forming one, two, three, four, five, six, seven, eight, nine, ten layers.

The aim of the invention is to create a flow-through filter with such constructions so that deposit will not be pasted, which makes it possible to avoid surge of biomass as well as excessive and uncontrolled overgrowth of carriers by a biofilm .

The curtain biological filter includes immobilized biomass also called a biofilm, developed on the vertical surface of a loosely falling partition made of plastic, favorably in the form of ropes. The ropes are synthetic fiber ropes of plastic, favorably of polypropylene and/or nylon and/or polyethylene with gauge from 5 to 50 mm. The ropes are arranged at a distance from 1 d to 10 d, where d means the rope' s diameter. The rope used for making a curtain may have the form of a twisted or braided rope. The curtain for settlement of immobilized biomass is placed in a steel frame of acid-resistant steel. In turn the steel frame is placed in guides resistant to corrosion caused by water or wastewater fixed inside the tank for treatment of water or wastewater. Favorably, the steel frame of the curtain is placed in the activated sludge reactor. Placement of the curtain with biological filter in guides makes it possible to evacuate the filter onto the surface outside of the biological reactor. A catch may be fixed to the curtain' s frame used for lifting it by means of a rope winch or crane fixed to the reactor' s wall.

The advantage of the proposed solution is simple and light construction of the filter which makes it possible to evacuate outside of the reactor' s tank. As a result of flow of wastewater the rope moves, thanks to which there is better diffusion of impurity to the biofilm and there is better effectiveness of removal of impurity. The existing shearing forces during flow of wastewater or water result in scouring away and tearing off of the excessively generated immobilized biomass in the form of the biofilm. This leads to more effective increase of biomass responsible for treatment of wastewater. Application of the curtain biological filter improves treatment of wastewater thanks to which a wastewater treatment plant will work in accordance with the water and legal permit.

The subject of the invention is presented in the following examples which do not limit this invention in any way, in the drawing on which fig. 1 shows the guide to the activated sludge reactor in which there is a frame with the curtain filter, fig. 2 presents the cross-section of the tank of activated sludge, and fig. 3 presents the tank of activated sludge with suspended in it curtain filters in diagonal view from a side.

Example I

The curtain biological filter includes immobilized biomass also called a biofilm, developed on the vertical surface of a partition made of plastic in the form of ropes 1. The ropes 1 are fiber ropes of plastic, polypropylene with gauge from 10 mm. The ropes 1 are arranged at a distance of 5 d, where d means the rope' s diameter. The rope 1 used for making a curtain may have the form of a twisted rope. The curtain for settlement of immobilized biomass is placed in a steel frame 2 of acid-resistant steel. In turn the steel frame 2 is placed in guides 3 resistant to corrosion caused by water or wastewater fixed inside the tank 4 for treatment of water or wastewater. The steel frame 2 of the curtain is placed in the tank 4 of activated sludge. Placement of the curtain with biological filter in guides 3 makes it possible to evacuate the filter onto the surface outside of the biological reactor. A catch may be fixed to the curtain' s frame 2 used for lifting it by means of a rope winch or crane fixed to the reactor's wall.

Example II

The curtain biological filter includes immobilized biomass also called a biofilm, developed on the vertical surface of a partition made of plastic in the form of ropes 1. The ropes 1 are fiber ropes of nylon with gauge from 25 mm. The ropes 1 are arranged at a distance of 10 d, where d means the rope's diameter 1. The rope 1 used for making a curtain may have the form of a twisted rope. The curtain for settlement of immobilized biomass is placed in a steel frame 2 of acid-resistant steel. In turn the steel frame 2 is placed in guides 3 resistant to corrosion caused by water or wastewater fixed inside the tank 4 for treatment of water or wastewater. The steel frame 2 of the curtain is placed in the tank 4 of activated sludge. Placement of the curtain with biological filter in guides 3 makes it possible to evacuate the filter onto the surface outside of the biological reactor. A catch may be fixed to the curtain' s frame 2 used for lifting it by means of a rope winch or crane fixed to the reactor' s wall.

Example III

The curtain biological filter includes immobilized biomass also called a biofilm , developed on the vertical surface of a partition made of plastic in the form of ropes 1. The ropes 1 are fiber ropes of polypropylene with gauge of 20 mm. The ropes 1 are arranged at a distance of 6 d, where d means the rope's diameter. The rope 1 used for making a curtain may have the form of a twisted rope. The curtain for settlement of immobilized biomass is placed in a steel frame 2 of acid-resistant steel. In turn the steel frame 2 is placed in guides 3 resistant to corrosion caused by water or wastewater fixed inside the tank 4 for treatment of water or wastewater. The steel frame 2 of the curtain is placed in the tank 4 of activated sludge. Placement of the curtain 4 with biological filter in guides 3 makes it possible to evacuate the filter onto the surface outside of the biological reactor. A catch may be fixed to the curtain' s frame used for lifting it by means of a rope winch or crane fixed to the reactor' s wall. Example IV

The curtain biological filter includes immobilized biomass also called a biofilm , developed on the vertical surface of a partition made of plastic in the form of ropes 1. The ropes 1 are fiber ropes of nylon with gauge of 30 mm. The ropes 1 are arranged at a distance of 6 d, where d means the rope's diameter. The rope 1 used for making a curtain may have the form of a twisted rope. The curtain for settlement of immobilized biomass is placed in a steel frame of acid-resistant steel. In turn the steel frame 2 is placed in guides 3 resistant to corrosion caused by water or wastewater fixed inside the tank 4 for treatment of water or wastewater. The steel frame 2 of the curtain is placed in the tank 4 of activated sludge. Placement of the curtain with biological filter in guides 3 makes it possible to evacuate the filter onto the surface outside of the biological reactor. A catch may be fixed to the curtain's frame 2 used for lifting it by means of a rope winch or crane fixed to the reactor' s wall.

Example V

The curtain biological filter includes immobilized biomass also called a biofilm, developed on the vertical surface of a partition made of plastic in the form of ropes 1. The ropes are fiber ropes of polyethylene with gauge of 40 mm. The ropes are arranged at a distance of 3 d, where d means the rope's diameter. The rope used for making a curtain may have the form of a twisted rope. The curtain for settlement of immobilized biomass is placed in a steel frame of acid-resistant steel. In turn the steel frame is placed in guides resistant to corrosion caused by water or wastewater fixed inside the tank for treatment of water or wastewater. The steel frame of the curtain is placed in the tank of activated sludge. Placement of the curtain with biological filter in guides makes it possible to evacuate the filter onto the surface outside of the biological reactor. A catch may be fixed to the curtain's frame used for lifting it by means of a rope winch or crane fixed to the reactor's wall.

Example VI

The curtain biological filter includes immobilized biomass also called a biofilm , developed on the vertical surface of a partition made of plastic in the form of ropes 1. The ropes 1 are fiber ropes of polyethylene with gauge of 40 mm. The ropes 1 are arranged at a distance of 5 d, where d means the rope's diameter. The rope 1 used for making a curtain may have the form of a twisted rope. The curtain for settlement of immobilized biomass is placed in a steel frame 2 of acid-resistant steel. In turn the steel frame 2 is placed in guides 3 resistant to corrosion caused by water or wastewater fixed inside the tank 4 for treatment of water or wastewater. The steel frame 2 of the curtain is placed in the tank 4 of activated sludge. Placement of the curtain with biological filter in guides makes it possible to evacuate the filter onto the surface outside of the biological reactor. A catch may be fixed to the curtain's frame 2 used for lifting it by means of a rope winch or crane fixed to the reactor's wall.

The biological filter in the form of a vertical curtain may be used in reactors for treatment of municipal wastewater or industrial wastewater. It may be used in new structures or in modernized structures.

Claims

Patent claims

1. The curtain biological filter includes immobilized biomass also called a biofilm , characterized in that it is developed on the vertical surface of a loosely falling partition made of plastic.

2. Curtain biological filter according to claims. 1 characterized in that the partition has the form of loosely falling ropes ( 1 ).

3. Curtain biological filter according to claims. 2 characterized in that the ropes ( 1 ) are fiber ropes of plastic.

4. Curtain biological filter according to claims. 3 characterized in that the ropes ( 1 ) are polypropylene ropes.

5. Curtain biological filter according to claims. 3 characterized in that the ropes ( 1 ) are polyethylene ropes.

6. Curtain biological filter according to claims. 3 characterized in that the ropes ( 1 ) are nylon ropes.

7. Curtain biological filter according to claims. 2 or 3 or 4 or 5 or 6 is characterized in that the ropes ( 1 ) have the gauge from 5 to 50 mm.

8. Curtain biological filter according to claims. 2 or 3 or 4 or 5 or 6 or 7 is characterized in that the ropes ( 1 ) are arranged at a distance from 1 d to 10 d, where d means the rope's diameter ( 1 ).

9. Curtain biological filter according to claims. 2 or 3 or 4 or 5 or 6 or 7 or 8 is characterized in that the rope ( 1 ) used for making the curtain has the form of a twisted or braided rope.

10. Curtain biological filter according to claims. 2 or 3 or 4 or 5 or 6 or 7 or 8 or 9 is characterized in that the curtain for settlement of immobilized biomass is placed in a steel frame ( 2 ) of acid-resistant steel and the steel frame ( 2 ) is placed in guides ( 3 ) resistant to corrosion caused by water or wastewater

11. Curtain biological filter according to claims. 10 is characterized in that the guides ( 3 ) of the steel frame ( 2 ) of the curtain is placed in the tank ( 4 ) of activated sludge.

12. Curtain biological filter according to claims. 10 or 11 is characterized in that a catch is fixed to the curtain's frame ( 2 ) used for lifting it by means of a rope winch or crane fixed to the reactor's wall.