Compact system for treating greywater for reuse

Abstract

The present invention relates to a compact system for biologically treating greywater for reuse, comprising an assembly of elements that treat greywater, wherein said greywater, after biological treatment and subsequent filtration and disinfection, leaves said system with characteristics appropriate for reuse for non-potable purposes (flushing toilets, cleaning, washing floors and streets, irrigating plants). Specifically, the greywater enters the system, undergoes initial decantation, then passes through the central part of the tank having the biorotor assembly. After going through the biorotor, the effluent again undergoes decantation and passes, via gravity, to an accumulation tank, from which it is routed, subsequently, to filtration and disinfection. Said biorotor is a partially submerged structure that slowly spins in a tank through which the greywater flows after decantation, wherein the shaft is always above the level of the effluent. The central part of the treatment system is made up of a support structure into which plastic media blocks, made from polypropylene, are inserted which have a large specific surface area, such as for example 240 m2 of surface area for each m3 of volume of material. The large contact surface provided by the honeycomb-shaped plastic structure has the function of providing a large area of contact with the effluent that passes through the rotor. As the effluent passes along the surface of the plastic media, a "biofilm" forms, which is made up of organic matter, microorganisms and air, wherein the organic matter degrades with the aim of biologically treating the wastewater or greywater.

Description

COMPACT GREYWATER TREATMENT SYSTEM FOR REUSE FIELD OF INVENTION

[0001] The present invention falls within the field of gray water treatment relating to the fraction of sewage corresponding to that generated in showers and washbasins, more specifically, the present invention is related to a compact system for biological treatment of gray water for reuse in non-potable purposes in residential, commercial and industrial projects using biological technology for biofilm formation in a biorotor, without the need for the addition of chemical products. FUNDAMENTALS OF THE INVENTION

[0002] This invention meets the needs of water reuse and environmental sustainability in residential and commercial projects. Biological treatment in rotors is a “clean” solution, with low energy consumption, low noise, compact, takes up little space and without the formation and special disposal of sludge.

[0003] The most common alternative to biological treatment of grey water followed by filtration and disinfection is treatment using physical-chemical systems that involve the addition of chemicals to the water to be treated and generate a residue with chemicals, sludge, which must be disposed of properly.

[0004] Another solution is to use a conventional activated sludge biological system, which does not work well for greywater due to the low organic load of the effluent, insufficient for efficient treatment using this technology, and the presence of saponaceous substances. Oxidation in activated sludge technology is performed by blowers or aerators, which generally consume much more electrical energy than that used in the present invention.

[0005] There are physical-chemical treatment systems that are based on the decantation of pollutant particles due to agglutination, after the addition of chemical products. This process, to be efficient, requires continuous control of the concentration of pollutants for the correct dosage of chemical products. The settled agglutinated particles form a chemical sludge, which may require special disposal and cannot be disposed of in the public sewage system. In addition, the possibility of purchasing chemical products in small quantities may be difficult for users of commercial and residential projects.

[0006] In some countries with high purchasing power, where reuse is necessary and water is scarce, there are some greywater reuse systems based on ultrafiltration membranes that ensure the removal of pollutants by pumping the effluent through surfaces with tiny pores. In this case, the membranes retain the pollutant particles. Although efficient, these systems require considerable energy expenditure for pumping (which would not be environmentally correct) and also have a cost that does not justify, in the current Brazilian reality, the reuse of greywater.

[0007] In this state-of-the-art scenario, the present invention proposes a system that works in such a way that its biological treatment process self-regulates according to variations in flow rate and organic load. The physical-chemical system involves the operation to control the dosage of chemical products, which may vary according to the variable composition and flow rate of the effluent.

[0008] One of the advantages of the rotor treatment system of the present invention is its compaction and effluent flow by gravity, in a single tank, (a monoblock), specifically for biological treatment of gray water (coming from washbasins and showers), specifically comprising a primary decanter, a biological treatment tank (rotors), a secondary decanter and an accumulation tank (for subsequent sending to a filter and in-line disinfection system - to meet the requirements of the Brazilian Standard - NBR 16783 - use of alternative sources of non-potable water in buildings, table 1).

[0009] Furthermore, among the advantages of the present invention is the Treatment for the degradation of organic matter, without the use of chemicals, based on the technology of biofilm formation on the surface of plastic hives. Natural aeration, without the need for blowers or aerators, with minimal use of electrical energy. In general, electrical energy consumption is minimal - only due to the activation of the gear motor that operates with a low-power motor, such as % CV in the case of a single-family system, for example. The gear motor operates with a reduction of 1:1200 to guarantee 1 to 3 revolutions per minute.

[0010] Other advantages of the present invention are that it is a simple system that operates on its own, with low energy consumption, and only requires simple maintenance, through annual periodic replacement of the gear motor oil and weekly or biweekly cleaning of the bottom of the tanks, with the opening of the bottom valves, where a watery sludge is formed, which can be easily disposed of in the public collection network, since it does not contain any chemicals. The system is very quiet and controlled, leaving no odor.

[0011] Additionally, the present invention has the advantage of having a self-cleaning hive system, since as the thickness of the biofilm increases with the passage of the effluent, it acquires a thickness that no longer allows the passage of oxygen to the hive / biofilm interface, causing anaerobic reactions, which release gases that generate expansion and cause the detachment of the biofilm plates, ensuring space for the formation of new biofilm plates. The residues detached from the surface of the rotor(s) fall into the water flow inside the rotor tank(s) and will settle in the secondary decanter.

[0012] In other words, the present invention differs from the state of the art by integrating, in a single body, in a “plug and play” type system, in a fiberglass reinforced plastic tank (GRP), the rotor or rotors (rotary fixed bed technology) with a plastic structure in the shape of a honeycomb of bees, in which the low power gear motor is coupled to a metal shaft around which the rotor and primary and secondary decanters rotate, in a compact manner. This single element, a monobloc, in which the rotor and decanters are inserted, consists of a fiberglass tank, which allows easy transportation and installation in different locations. In addition, as previously mentioned, all gray water treatment occurs with low energy consumption, odorless and noiseless.

[0013] Specifically, the fiberglass reinforced plastic tank is manufactured from a mold and a design that includes compartments and supports with dimensions and resistance suitable for the proper functioning of the system. The material has good chemical and mechanical resistance for its intended purposes. Each compartment is equipped with a lid. The rotor tank has a rounded lid with vents through which air passes, necessary to guarantee the efficiency of the aerobic biological treatment. The metal shaft around which the rotor assembly is installed is supported, on one side, by the tank itself and, on the other side, is coupled to the gear motor, which is also supported and inserted into the body of the system (the GRP tank).

[0014] In general, in conventional biological treatment systems (activated sludge), the assembly of the decantation tanks and the aerobic biological treatment tank is usually done at the installation site, in separate tanks, requiring specialized labor for integration on site. Unlike state-of-the-art systems, this invention already combines the parts in a single tank, avoiding the need for connections between the parts on site. In addition to providing a contact surface for biofilm adhesion, the interconnection between the parts of the tank occurs by gravity, through pipes located at the top of each compartment, appropriately positioned for the passage of effluent through the system, without the need for pumping / electrical energy to conduct the effluent through the system. In other words, the effluent leaves each of the compartments with a slightly lower level than when it entered. STATE OF THE TECHNIQUE

[0015] The Brazilian patent application published on 12 / 19 / 2017, BR1020160128587 A2, entitled “GRAYWATER TREATMENT PLANT AND PROCESS FOR PRODUCTION OF NON-POTABLE REUSE WATER”, reveals a graywater treatment system, belonging to the field of wastewater treatments, comprising a graywater treatment plant ETAC, formed essentially by the association, in series and successively, of devices that perform the following processes: 1) - Pre-treatment carried out through screening or fine sieving; 2) - Anaerobic treatment carried out in an anaerobic filter - FAN; 3) - Aerobic treatment carried out in a submerged aerated biological filter - FBAS and secondary decanter - DEC; 4) - Tertiary treatment carried out in a rapid granular or cartridge filter - FT and Disinfection by chlorination or ozonation or by ultraviolet radiation.

[0016] Unlike the system in document BR1020160128587 A2, the present invention provides for an essentially aerobic treatment in a monobloc physical structure. Document BR1020160128587 A2 describes the insertion of an anaerobic filter - in which the degradation of organic matter is carried out without the presence of air and, therefore, oxygen. Anaerobic treatments produce odor because they release odorous gases and require greater process control, mainly of the sludge content in the biological treatment chamber. Unlike document BR1020160128587 A2, the present invention is based on the formation of biofilm on a contact surface, which allows the system to adapt in the event of variations in organic load or flow rate. This means that if, for example, the organic load increases, the biofilm formed will be thicker. At organic loads lower than the expected average, the biofilm will be thinner.In both cases, if there is sufficient air, the chemical reactions take place, the organic matter degrades and the system performs well, giving the treatment system good flexibility. When the thickness of the biofilm no longer allows air to enter the biofilm-hive interface, expansion reactions occur that cause parts of the biofilm to detach. The space previously occupied by the biofilm is left behind. The part that has come loose now offers a new surface for bacteria and organic material to adhere to. The parts that have come loose should fall into the flow in the rotor tank and be sedimented in the secondary decanting tank, downstream. Tertiary treatment with a granular filter or cartridge and disinfection are technologies that are already well-established in the technical area and will also be used for the treatment of gray water in the present invention, after passing through the monoblock in which decantation and biological treatment occur.

[0017] The document published on 05 / 12 / 2013, WO2013181426A2, entitled “Grey water separation device”, relates to a device and a method for the physical system filtration of grey water from a residential home. In some embodiments, the grey water may be filtered using a conical rotor and filtration media, which may provide enhanced filtration through the use of Taylor vorticity filtration. The filtered water may have various household uses after filtration. The grey water is transported to a filtration device, comprising a housing comprising a filter; a rotor coupled to a rotational drive means and configured to rotate within the housing; a space between the housing and the rotor, such that the rotor rotates within the housing; filters the grey water while rotating the rotor within the housing and transports the filtered grey water to a fixture, reservoir or system configured to utilize or store the filtered grey water.

[0018] Unlike the present invention, document WO2013181426A2 essentially consists of a filtration system, i.e., retention of pollutant particles by means of a physical barrier. In general, physical barriers, even in vortices, are not sufficient to eliminate the organic load from the gray water effluent - for this reason there are biological filters, such as the one used in the present invention, which degrade the organic matter so that it can then undergo physical filtration.

[0019] The document published on 01 / 30 / 2020, W02020020455A1 entitled “A GREYWATER SYSTEM”, shows the application of a water system to be arranged in a structure, wherein the water system comprises a plurality of water use stations and a grey water arrangement connected to the water use stations at a downstream end of each water use station for collecting waste water from the water use stations. The grey water arrangement is further connected to the water use stations at an upstream end of each water use station for returning the grey water to the water use stations. Furthermore, the grey water arrangement comprises a heating arrangement adapted to heat the waste water to an elevated temperature.

[0020] In general terms, document W02020020455A1 describes that the destination of the treated water is for a purpose that requires water at a high temperature. The present invention, in a distinct manner, is intended for non-potable uses, at room temperature, such as flushing toilets, cleaning, watering gardens, among others.

[0021] Therefore, as seen previously, the technique lacks a system with biological treatment through rotor technology that rotates, partly immersed in the effluent and partly outside it. Specifically, the technique lacks a gray water treatment system for reuse comprising a primary decanter, a biological treatment tank (containing a semi-immersed hexagonal-shaped rotor, filled with plastic material and with a specific surface / contact of 240 m 2 / m 3 , with a non-immersed metal horizontal shaft, a plastic support structure and a gear motor that rotates the assembly, a secondary decanter, an accumulation tank. SUMMARY OF THE INVENTION

[0022] The present invention proposes a compact system for treating grey water for reuse, comprising: one or more rotors (1) with honeycomb blocks (1 A) mounted on a support structure (11), in compartments (10) and a lid (13); a primary decanter (2) having a lid (14); a secondary decanter (3) having a lid (15); a grey water inlet (4); an accumulation tank (7) having an inlet (17); drains (5, 6); an inspection nozzle with CAP (8); an overflow (9); support angles for the hives (11); a pipe between the primary decanter (2) and the rotor tank (12); a geared motor (25); a pipe between the rotor tank (12) and the secondary decanter (16); a pipe between the secondary decanter (16) and the accumulation tank (17); a key (18); a solid shaft dowel (19); a split bearing (20); a self-aligning ball bearing (21); a bearing locking ring (22); a crown and worm screw (23); a motor to drive the geared motor (24); a lamella shelter (26); in which the system has compaction and effluent flow by gravity, in a single gray water biological treatment tank. In which the rotor(s) (1) has a hexagonal shape, with a metal shaft and plastic or metal support brackets (11), functioning as a biological treatment tank.The said hives (1 A) comprise plastic material filling and a specific surface area preferably of 240m. 2 / m 3of material. From the accumulation tank (7) the effluent flows for filtration and disinfection. In which the system performs a treatment process from a biofilm formed on the surface of the hive (1 A) according to the flow rate and the organic load of an effluent, such as gray water. The rotor(s) (1) is a semi-submerged structure that rotates slowly in a tank through which the gray water flows, after decantation, with the axis always above the level of the effluent. The system has a lid (14) that comprises a support structure in which plastic media blocks, in polypropylene, are inserted, which have a large specific surface. Said corners (11) are preferably composed of steel or pultruded plastic. Said lids (13, 14, 15) are preferably made of fiberglass reinforced plastic. The biological treatment process is self-regulated based on a variation in flow rate and organic load.Furthermore, the system can operate without the need for manual labor to control the dosage of chemical products. In this way, treatment for the degradation of organic matter is carried out without the use of. chemical products, based on the formation of a biofilm on the surface of the plastic hives (1 A). In addition, the system performs natural aeration, without the need for blowers or aerators, with minimal use of electrical energy. Additionally, the system has self-cleaning hives (1 A), acting as the thickness of a biofilm increases with the passage of an effluent, the said biofilm acquiring a thickness that does not allow the passage of oxygen to a biofilm-hive interface, where the said biofilm is located, where the anaerobic reactions generated release gases generating expansion and causing the detachment of the biofilm plates, thus providing space for the formation of new biofilm plates. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be described below with reference to its typical embodiments and also with reference to the attached drawings, in which: figure 1 is a perspective representation of an assembly of the gear motor (25) of the claimed system and its installation in the monoblock, with key (18), solid billet (19), bearing (20), roller (21), ring (22), crown (23) and electric motor for drive (24).In addition to representing the claimed system itself, which comprises a primary decanter (2), a secondary decanter (3), rotor(s) (1) with structure (11) for supporting plastic honeycombs (1A), compartment(s) for rotor(s) (10), an accumulation tank (7), lid for primary decanter (14), lid for secondary decanter (15), lid for rotor(s) compartment with ventilation (13), gear motor (25) coupled to a metal shaft supported by bearings (20) on the sides of the rotor compartment (10), according to a preferred embodiment of the present invention.

[0024] Figure 2 is a representation of the claimed system comprising a primary decanter (2), a secondary decanter (3), rotor(s) compartment (10), a grey water inlet (4), drains (5, 6) and accumulation tank (7), an inspection port with CAP (8), in accordance with a preferred embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0025] Specific embodiments of the present disclosure are described below. In an effort to provide a concise description of these embodiments, all features of an actual implementation of the system may not be described in the specification. It should be appreciated that in developing any actual implementation, as in any engineering or design project, numerous implementation-specific decisions must be made to achieve the specific objectives of the developers, such as compliance with constraints related to the gray water treatment system for reuse, which may vary from one implementation to another.

[0026] Specifically, the present invention consists of a set of elements, whereby the gray water, after treatment, leaves the system and, after undergoing filtration and disinfection, presents characteristics suitable for reuse for non-potable purposes (toilet flushing, cleaning, washing floors and sidewalks, watering plants). The gray water enters the system (4), undergoes initial decantation in the primary decanter (2), allowing the components of the mixture to separate naturally due to the difference in density and sedimentation, without the need for complex mechanical intervention, and then passes through the central part of the system: the biorotor assembly (1). After passing through the biorotor assembly (1), the effluent passes once again through secondary decantation (3) and goes, by gravity, to the accumulation tank (7).The passage by gravity occurs because the effluent outlet level of the secondary settling tank (17) is lower than the respective effluent inlet level (16) in the tank. The accumulation tank (7) is at a lower level than the secondary settling tank (3) so that the effluent that flows through the decanter outlet pipe is directed to the inlet of the accumulation tank by means of a pipe (17). The biorotor assembly (1) is a semi-submerged structure that rotates slowly in a tank through which the gray water flows, after an initial decantation.

[0027] In other words, the present invention proposes a compact system for biological treatment of gray water for reuse, comprising one or more rotors (1) having compartments for rotors (10) and a lid (13), a primary decanter (2) having a lid (14), a secondary decanter (3) having a lid (15), a gray water inlet (4), an accumulation tank (7), having a passage pipe from the primary decanter to the rotor tank(s) (12), a passage pipe from the rotor compartment(s) to the secondary decanter (16), honeycomb blocks forming the “filling” of the rotors (1 A), drains (5, 6), an inspection port with CAP (8), an overflow (9), angles forming a structure for the honeycomb blocks (11), a pipe to carry the effluent from the secondary decanter to the accumulation tank (17), a gear motor (25) that rotates a axis on which the structure with plastic honeycombs is installed (11, 1A), a solid shaft rod (19), a key (18),a split bearing (20), a self-aligning ball bearing (21), a bearing locking ring (22), crown and worm gear (23), an electric motor for driving the gear motor system (24) and a lamella shelter (26). In which the rotor(s) (1) has a hexagonal shape, with a metal shaft and support structure (11) for plastic material (honeycombs) (1A), installed in the rotor compartment (10), functioning as a biological treatment tank. Said honeycombs comprise plastic material filling and a specific surface of 240m, 2 / m 3 of material.

[0028] The effluent is filtered and disinfected after it passes through the tank using external systems, such as sand and carbon filters. The simplest disinfection system is that using chlorine, although ozone and UV systems can also be used, for example. The system is automated, the effluent comes from a raw water tank (grey water before treatment) and is directed to the monobloc (consisting of decanters, a rotor tank and a contact tank). In the monobloc, the effluent flows by gravity between the various compartments (due to the difference in level between the inlet and outlet pipes of the compartments). until reaching an intermediate tank. Level sensors in the final treated water tank activate a pump that directs the effluent, after biological treatment, to a sand filter and disinfection by chlorine or another process (ozone and UV, for example). The biological treatment process carried out by the rotors self-regulates according to variations in flow and organic load.

[0029] Wherein each rotor (1) is a semi-submerged structure that rotates slowly in compartment(s) of a tank (10) through which the grey water flows, after decantation. The number of rotors required in the present invention is calculated according to the organic load of the effluent that enters the rotor tank, after sedimentation in the primary decanter. Each rotor consists of a support structure (11) in which plastic media blocks (1 A), in polypropylene, which have a large specific surface area, are inserted. Wherein said corners (11) that support the hives are preferably composed of steel or pultruded plastic, said covers (13, 14, 15) are preferably made of plastic reinforced with fiberglass.

[0030] The present invention is based on the formation of a biofilm on a contact surface, which allows the system to adapt to variations in organic load or flow rate. This means that if, for example, the organic load increases, the biofilm formed in the presence of air will be thicker. At lower organic loads than the expected average, the biofilm will be thinner. In both cases, if there is sufficient air, the chemical reactions necessary to reduce the organic load occur and the system performs well, providing good flexibility to the treatment system. When the thickness of the biofilm no longer allows air to enter the biofilm-honeycomb interface, expansion reactions occur at the interface that cause parts of the biofilm to detach. The space previously occupied by the biofilm left by the detached part now offers a new surface for the adhesion of bacteria and organic material.The detached parts must fall into the flow in the rotor tank and be sedimented in the secondary decanter tank, downstream.

[0031] The central part of the treatment system of the present invention is consisting of a support structure (11) in which plastic media blocks (1A) are inserted, in polypropylene, which has a large specific surface, preferably 240 m 2 of surface for each m 3 of material volume, which rotates around an axis. The smaller the specific contact surface, the greater the amount of plastic media blocks will be required for the degradation of the same organic load. The present invention is preferably dimensioned for 240 m 2 / m 3. Depending on the flow rate and the influent organic load, the biorotor assembly may consist of one or more rotating units around the metal shaft. The large contact surface provided by the honeycomb / beehive-shaped plastic structure (1 A) has the function of offering a large contact area for the effluent that passes through the hexagonal-shaped rotor(s) (1 ), with a metal shaft and support structure made of plastic or metal angles (11 ). As the effluent passes through the plastic media surface, the so-called biofilm is formed, which is composed of organic matter, microorganisms and air, where the degradation of the organic matter occurs with the aim of biological treatment of the sewage.

[0032] In other words, the grey water in the system is sent to the primary decanter (2), where it must settle the heaviest residues. To optimize this process, the effluent enters the decanter at one corner and exits at a diametrically opposite corner so that the effluent can travel the longest distance between the inlet (4) and the outlet (12), thus allowing the sedimentation of particles. At the bottom of this unit (2) of the system there is an outlet, a drain (5) that allows the periodic cleaning of the tank.

[0033] After the primary decanter (2), the effluent free of heavier residues passes to the rotor tank (10) where biological treatment (degradation of organic matter) takes place. The inlet pipe (12) and the outlet pipe (16) of this tank are arranged on opposite walls, one at each end, so that the fluid can travel as far as possible, ensuring the detention time necessary for passing through the elements. the rotors (1). The biological treatment tank has drain(s) (6) at the bottom for cleaning. As the biofilm formed on the surface of the rotors (1) becomes thicker, biofilm “plates” are released into the liquid, which ends up being carried, with the flow, to the secondary decanter (3).

[0034] The secondary decanter (3) is part of the fiberglass monobloc and has a truncated cone-shaped bottom to improve sedimentation of the biomass coming from the rotor tank. Then, free of sediments decanted in the secondary decanter (3), the effluent is sent to an accumulation tank (7) so that it can later be directed to the filtration and disinfection system external to the monobloc, which is the object of the present invention. From the accumulation tank, the treated effluent is sent to a filtration and disinfection system, which is separate from the monobloc, allowing the reuse of treated gray water for non-potable purposes (flushing toilets, cleaning floors and sidewalks, watering plants, irrigating lawns, replenishing water for water features, ornamental lakes, among others).

[0035] In a first aspect of the invention, the rotors (1) are semi-submerged in the liquid, so that there is always a part of the rotor (1) submerged and the other exposed to the air, with the rotor axis always above the level of the effluent. When the rotor (1) rotates, the part of the biofilm that was immersed in the effluent becomes exposed to the air. Thus, the necessary aeration is provided, that is, oxygen, so that the microorganisms in the effluent itself can carry out the aerobic chemical reactions that result in the treatment of the effluent, so that the microorganisms can aerobically degrade the organic matter spread over the surface of the hives; the presence of oxygen is necessary.

[0036] While aspects of the present disclosure may be susceptible to various modifications and alternative forms, specific embodiments have been shown by way of example in the drawings and have been described in detail herein. But it should be understood that the invention is not intended to be limited to the particular forms disclosed. Rather, the invention must cover all modifications, equivalents and alternatives that fall within the scope of the invention as defined by the following appended claims.

Claims

CLAIMS 1. Compact grey water treatment system for reuse, in that it comprises: one or more rotors (1) with hive blocks (1 A) mounted on a support structure (11), in compartments (10) and a lid (13); a primary decanter (2) having a lid (14); a secondary decanter (3) having a lid (15); a gray water inlet (4); an accumulation tank (7) having an inlet (17); drains (5, 6); an inspection nozzle with CAP (8); an overflow (9); support angles for the hives (11); a pipe between the primary decanter (2) and the rotor tank (12); a gear motor (25); a pipe between the rotor tank (12) and the secondary decanter (16); a pipe between secondary decanter (16) and accumulation tank (17); a key (18); a solid shaft rod (19); a split bearing (20); a self-aligning ball bearing (21); a bearing locking ring (22); a crown and worm screw (23); a motor to drive the gear motor (24); a lamella shelter (26); in which the system has compaction and effluent flow by gravity, in a single biological gray water treatment tank.

2. System, according to claim 1, characterized by the fact that the rotor(s) (1) has a hexagonal shape, with a metal shaft and plastic or metal support brackets (11).

3. System, according to claim 1, characterized by the fact that said hives (1 A) comprise plastic material filling and a specific surface preferably of 240m 2 / m 3 of material.

4. System according to claim 1, characterized in that the effluent flows from the accumulation tank (7) for filtration and disinfection.

5. System, according to claim 1, characterized by the fact that it performs a treatment process from a biofilm formed on the surface of the hive (1 A) according to the flow rate and organic load of an effluent, such as gray water.

6. System, according to claim 1, characterized by the fact that the rotor(s) (1) is a semi-submerged structure that rotates slowly in a tank through which the gray water flows, after decantation, with the axis always remaining above the effluent level.

7. System, according to claim 1, characterized by the fact that it has covers (13, 14, 15) which is a support structure in which blocks of plastic media, in polypropylene, are inserted, having a large specific surface.

8. System according to claim 1, characterized in that said corners (11) are preferably composed of steel or pultruded plastic.

9. System according to claim 1, characterized in that said covers (13, 14, 15) are preferably made of fiberglass reinforced plastic.

10. System, according to claim 1 or 5, characterized by the fact that said biological treatment process self-regulates based on a variation in flow rate and an organic load.

11. System, according to claim 1, characterized by the fact that it comprises operating without the need for manual work to control the dosages of chemical products.

12. System, according to claim 1, characterized by the fact that a treatment for degradation of organic matter is carried out without the use of chemical products, based on the formation of a biofilm on the surface of the plastic hives (1 A).

13. System, according to claim 1, characterized by the fact that it performs natural aeration, without the need for the use of blowers or aerators, with minimal use of electrical energy.

14. System, according to claim 1, characterized by the fact that it has self-cleaning hives (1 A), acting as the thickness of a biofilm increases with the passage of an effluent, said biofilm acquiring a thickness that does not allow the passage of oxygen to a biofilm-hive interface, where said biofilm is located, in which the anaerobic reactions generated release gases, generating expansion and causing the detachment of the biofilm plates, thus providing space for the formation

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