RU95331U1 - BIOREACTOR OF TREATMENT OF BIOLOGICALLY PURIFIED WASTE WATERS - Google Patents

Abstract

Bioreactor for post-treatment of biologically treated wastewater, including a body with dedicated functional zones of sorption and biooxidation, physicochemical treatment, communication systems for supply, distribution, removal of treated additional purified water and wash water after sorption and biooxidation, after the zone of physicochemical wastewater treatment, water recirculation by airlift niches, air supply, pipelines for introducing reagents into the post-purified water after the oxidation zone, loading in the form of a fibrous brush nozzle and granular materials, regeneration bubbler systems located under each functional zone, characterized in that it is equipped with two outlet pipelines through shut-off valves wash water separately from the zone of sorption and biooxidation and separately from the zone of physicochemical treatment, by a pump for flushing the zone of physicochemical treatment from the zone of sorption and biooxidation, water supply for treatment to the zone of sorption and biooxidation is made from top to bottom, and into the zone of physical chemical eyes wastewater - from bottom to top in an ascending flow, to empty the sorption and biooxidation zone from the wash water, the wash water pump of the physicochemical treatment zone is used, the wash water outlet pipe of the physicochemical treatment zone is located above the additional purified water outlet pipe.

Description

The utility model relates to devices for the purification of biologically treated urban and industrial wastewater close to them and can be used in municipal services of settlements and industrial enterprises, if necessary, to bring the quality of purified water to the level of standards for its release into fishery reservoirs.

It is known that the use of aerated capacitive structures filled with a fiber brush nozzle for the purification of biologically treated wastewater [1]. Unfortunately, the method and device for its implementation is unsuitable if it is necessary to remove wastewater phosphates by binding them with reagents toxic to aquatic organisms to insoluble compounds, followed by retention of these compounds by the nozzle.

Closest to the design and communication system and devices for the design of the bioreactor of bioremediated wastewater treatment to the claimed utility model is the patent for utility model [2] of the bioreactor of wastewater treatment, including a housing with dedicated functional zones of sorption and biooxidation, physico-chemical water purification, communication systems for supply, distribution, drainage systems for collecting treated water after sorption and biooxidation zones, physico-chemical sewage, drainage of cleaned wastewater, recirculation by airlifts, supply of water for flushing and drainage of flush water, air supply, pipelines for introducing reagents into the treated water, loading in the form of a fibrous nozzle and granular materials, equipped with at least two airlift niches located inside or outside buildings and connected to each functional zone, providing drainage and / or circulation of wastewater from each or all functional zones, the drainage system for collecting treated water and air inlet is made under each functional zone, and the reagent inlet pipe is mounted after the oxidation zone.

The design proposed in the prototype has a number of disadvantages: for washing the functional zones, purified water accumulated in clean water tanks is required, the nozzle used for sorption and biooxidation is contaminated with toxic substances that are washed off with granular, for example, purolate (anthracite) loading, which reduces its oxidative power and increases the need for flushing water.

The purpose of the claimed utility model is to eliminate the need for clean water tanks, reduce the amount of wash water with metal-containing sediments, increase the oxidative power of the sorption and biooxidation zone.

The goal is achieved in that the bioreactor for the purification of biologically treated wastewater, including a housing with dedicated functional zones of sorption and biooxidation, physico-chemical treatment, a communication system for supplying, distributing, draining treated water and washing water after the sorption and biooxidation zone, after zones of physico-chemical wastewater treatment, water recirculation by airlift niches, air supply, pipelines for introducing reagents into the purified water after the biooxidation zone, loading into a view e of a fiber brush nozzle and granular materials, regeneration bubbler systems located under each functional zone, equipped with two piping for washing water drainage separately from the sorption and biooxidation zone and separately from the physical and chemical treatment zone, through a shut-off valve, with a water feed pump for washing the zone of physical chemical treatment from the sorption and biooxidation zone, water was supplied for treatment to the sorption and biooxidation zone from top to bottom, and upward to the physicochemical treatment zone from bottom to top, for emptying eniya from wash water sorption zone and biooxidation activated pump wash water zone physico-chemical purification and the rinsing water outlet tube physicochemical purification zone is located above the tube outlet to the purified water.

Patent studies have shown that neither in the patent nor in the scientific and technical literature there is information about bioreactors for the purification of biologically treated wastewater of such a design and configuration as proposed in the utility model formula, which suggests that the proposed bioreactor for the purification of biologically treated wastewater meets the patentability criterion of "novelty."

A comparative analysis of devices that are used in known technical solutions, including in the prototype, showed significant features that distinguish the proposed solution.

The advantages that are achieved indicate that the tasks that are solved are performed at the inventive step, since they do not follow, obviously, from solutions known in the art and therefore meet the patentability criterion of "inventive step".

The proposed bioreactor for the purification of biologically treated wastewater is illustrated by drawings, where Fig. 1 shows a horizontal section of a bioreactor of a wastewater treatment, and in Fig. 2 a vertical section of a bioreactor.

The designations in the drawings are as follows:

1. The body of the bioreactor of wastewater treatment.

2. The zone of sorption and biooxidation.

3. Frames with a fiber ruffled nozzle.

4. Airlift niches.

5. A partition separating the sorption and biooxidation zones from the physicochemical treatment zone.

6. Bubblers of regeneration.

7. Air duct.

8. The zone of physical and chemical wastewater treatment.

9. Grain loading.

10. The support layer.

11. A pump for supplying washing water from the sorption and biooxidation zone to the physicochemical treatment zone.

12. Bypass pipe supply to purified water from the sorption and biooxidation zone to the zone of physical and chemical treatment.

13. The pipeline input reagents.

14. Pipeline for emptying the sorption and biooxidation zone during the regeneration of the fiber brush nozzle using a pump 11.

15. The pipeline branch to the purified water.

16. Pipeline for water supply for post-treatment.

17. The pipeline drainage of wash water from the zone of physico-chemical treatment.

18. Pipeline for supplying washing water to the zone of physico-chemical water treatment.

The bioreactor for the treatment of biologically treated wastewater (Figure 1, 2) is made in the form of a rectangular tank in plan, the housing (1) of which can be made of metal, plastic or reinforced concrete. The tank is divided by a transverse partition (5) into two zones. The sorption and biooxidation zone (2) is the first to receive biologically purified water through a pipe (16) after secondary clarifiers for additional treatment. In the volume of zone (2) of sorption and biooxidation, a fiber ruffled nozzle is fixed on the frames (3). On both sides, the sorption and biooxidation zone (2) is equipped with airlift niches (4), in which air from the main duct (7) is introduced through perforated pipes. For regeneration of the fiber ruffled nozzle in the frames (3), regeneration bubblers (6) connected with the air duct (7) are placed under the frames with a pitch of 200 mm under the frames. From the sorption and biooxidation zone (2), the purified water flows into the physical and chemical treatment zone (8) through a bypass pipe (12) under the support layer (10) of zone (8), consisting of crushed stone or gravel with a particle size of 5 ... 8 mm and a layer of 50 mm .

A granular load (9) of anthracite grains with a grain size of 1.6 ... 4 mm is poured onto the support layer (10). Regeneration bubblers (6) are placed in the supporting layer (10), which are communicated through shut-off valves with an air duct (7). A reagent inlet pipe (13) is cut into the bypass pipe (12). Above the granular charge (9), in the physicochemical (8) water treatment zone, a frame (3) with a fiber ruffled nozzle is placed.

Discharge to the purified water from the zone (8) of physico-chemical treatment is carried out through the pipeline (15). For washing the granular charge (9), a pipeline (18) is provided, which communicates through the pump (11) the sorption and biooxidation zone (2) with the physicochemical treatment zone (8). Wash water is withdrawn from zone (8) of physico-chemical treatment through a pipeline (17).

During the regeneration of the fibrous ruffled nozzle of the frames (3) due to the bubbling of water located in the sorption and biooxidation zone (2), the zone (2) is emptied from the wash water by means of a pump (11) through a pipeline (14).

The bioreactor for the purification of biologically treated wastewater works as follows. Biologically treated wastewater after leaving the secondary sumps, as a rule, has values of quality parameters that do not meet the requirements of the standards for discharge into the fishery pond according to such indicators as BOD _p , suspended solids, phosphates and nitrogen. Entering through the pipeline (16) for supplying the source water to the after-treatment, the biologically treated wastewater enters the tank of the after-treatment bioreactor, inside the housing (1) into the sorption and bio-oxidation zone (2). Due to the presence of airlift niches (4) equipped with perforated air inlet pipes from the duct (7) inside the sorption and biooxidation zone (2), the wastewater is continuously circulated, in the niches (4) the air-water mixture moves upwards and is saturated with air oxygen along the way. In the middle part of zone (2) there are frames (3) with a fiber ruffle nozzle. A moving flow of wastewater from top to bottom through the fiber brush nozzle induces a flow potential on the fibers of the brush brush that provides sorption properties of the fibers with respect to microorganisms of activated sludge. Microorganisms of activated sludge particles adsorbed on fibers, consuming oxygen dissolved in water, oxidize organic impurities of wastewater, reducing the BOD value _n and the content of N-NH ₄ ⁺ . Sludge retention reduces the amount of suspended solids in wastewater. Usually, during normal operation of the main biological wastewater treatment plant - an aeration tank and a secondary settling tank, the removal of suspended solids of activated sludge does not exceed 15 mg / l. Silting of the fibrous ruffled frame nozzle (3) occurs in 7 ... 10 days, after which it is necessary to remove excess silt particles. In order to disrupt sludge particles from the fiber ruff nozzle, sorption and biooxidation are fed into the zone (2) of sorption and biooxidation through the regeneration bubblers (6) and the shutoff valves of the pump (11) are opened to divert sorption zone (2) through the pipeline (14) and biooxidation from the sludge mixture. During the regeneration of the fiber nozzle, the supply of source water to the zone (2) is stopped.

Wash water is a sludge mixture, from the zone (2) of sorption and biooxidation is pumped out by pump (11) to the head of the treatment plant or in front of the secondary sumps. After passing through sorption and biooxidation in zone (2) before treatment, waste water flows through a bypass pipe (12) over the baffle (5) into the physicochemical treatment zone (8) under the support layer (10). Next, the wastewater is filtered through a granular charge (9) from particles of anthracite (purolate). Since reagents containing aluminum or iron are continuously introduced into the bypass pipe (12) through the pipe (13), combining with aluminum or iron phosphates, they form insoluble substances (AlPO ₄ or FePO ₄ ), which are retained in the filter by a granular charge (9 ) Depending on the phosphate content and dose of reagents, the amount of insoluble substances may be different. After the dirt capacity of the granular load (9) has been exhausted, its pores are clogged by deposits and the filter's resistance to water flow increases, which causes an increase in the water level in the sorption and biooxidation zone (2) and gives a signal about the need for regeneration of the granular load (9). To regenerate the granular charge (9), the pump (11) is switched on to supply the washing water through the pipe (18) from the sorption and biooxidation zone (2) to the physicochemical treatment zone (8). At the same time, the valve on the pipeline (15) for discharging purified water is closed. Simultaneously with the supply of washing water by the pump (11) to the support layer (10), air is supplied from the duct (7) through the regeneration bubblers (6). The water-air mixture expands the granular load (9), causes the grains of anthracite to rub against each other and free themselves from deposits of metal phosphates (Al or Fe). The wash water rises to the level of the location of the pipe (17) for the removal of wash water from the zone (8) of physico-chemical treatment and is discharged into the dirty water reservoir for the accumulation of metal-containing sediments.

The use of water from the sorption and biooxidation zone (2) for washing the granular load (9) of the physicochemical treatment zone (8) eliminates the need for the clean water unit in the aftertreatment unit required in the prototype. Separate regeneration of zones reduces the amount of metal-bearing precipitation. The absence of metal-containing sediments on the fiber brush nozzle of the sorption and biooxidation zone eliminates the toxic effect of metals on the biological process and provides a solution to the problem - increasing the oxidative power of the sorption and biooxidation zone.

The presence of frames (3) with a fiber ruffle nozzle above the granular load (9) ensures uniform distribution of the wash water flow over the cross section of the physicochemical treatment zone (8) and helps to reduce the spread of the expanded granular load (9) with wash water.

Claims (1)

A bioreactor for the treatment of biologically treated wastewater, including a housing with dedicated functional zones of sorption and biooxidation, physico-chemical treatment, a communication system for supplying, distributing, discharging treated treated water and wash water after sorption and biooxidation, after the physico-chemical wastewater treatment zone, water recirculation by airlift niches, air supply, pipelines for introducing reagents into the purified water after the oxidation zone, loading in the form of a fiber ruffled nozzle and granular materials alov, regeneration bubbler systems located under each functional zone, characterized in that it is equipped with two flushing water discharge pipes through shut-off valves separately from the sorption and biooxidation zone and separately from the physicochemical treatment zone, with a feed pump for flushing the physicochemical treatment zone from sorption and biooxidation zones, water was supplied for treatment to the sorption and biooxidation zone from top to bottom, and to the physicochemical treatment zone from bottom to top in an upward flow, for emptying from the wash zone of The rbc and biooxidation uses a pump for washing water in the zone of physico-chemical treatment, the outlet pipe for washing water in the zone of physico-chemical treatment is located above the pipe for removing treated water.