JPS6239006B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for treating backwash effluent resulting from backwash operations performed on industrial filters. In particular, the present invention uses backwash filters to purify backwash effluent from solids and other impurities released from industrial filters during backwash operations, and the treated and purified backwash liquid The present invention relates to a method and apparatus for recirculating water for use in subsequent and repeated backwashing operations.

In many beverage and bottling plants currently in operation, sand and carbon type industrial filters are used in the industrial processes carried out in these plants. These sand and carbon filters are designed to be periodically or repeatedly cleaned by backwashing operations, during which water-based solutions or liquids are removed from the flow through the filters during normal overloading. It is designed to be guided through each filter in backwashing. Backwashing methods are suitable for removing solid and particulate matter from industrial filters in order to maintain them in effective operating condition. Typically, backwashing operations require the use of large amounts of water and during this operation varying amounts of sticky solids are expelled so that solids are released for removal from industrial filters.

In a typical backwash operation of this type, the effluent from the backwash operation is dumped into the general effluent discharge of the plant, which causes a number of deleterious effects. For example, the backwash fluid must be treated with expensive chemical additives to maintain its PH and chlorination values within predetermined parameters to impart maximum purification properties to the solution during the backwash operation. Because they consist of water-based solutions, they are often expensive. Therefore, the introduction of backwash effluent into the general effluent discharge of the plant and its subsequent one-time use results in the waste of expensively treated backwash liquid, often making the operation uneconomical. Make it expensive. Additionally, the discharge of backwash effluent into a plant's waste treatment system often places a significant burden on the system, sometimes creating an acute demand on the system. Waste treatment systems are highly or shockingly loaded due to the large amounts of backwash liquid associated with the operation and because the solution is carried with significant amounts of solid and particulate matter that is chlorinated and backwashed from industrial filters. be done.

In the past, various systems are known to those skilled in the art with the capability of reclaiming and reusing backwash water, but these conventional systems do not handle the large amount of solids released from industrial filters during backwash operations. It is not intended to control or eliminate. In addition, conventional systems do not attempt to optimize the backwash operation by maintaining the chlorination and acidity or PH value of the backwash liquid at a level where the backwash action is most effective.

The present invention is based on DeLonge's U.S. Patent Application No.
No. 832283, of particular use, relates to a method and apparatus for treating aqueous waste materials and effluents from bottling plants and equipment. DeLong's method and system are particularly concerned with the removal of biological oxygen demand (BOD) from waste materials and are relevant for treating many different types of effluent discharges in beverage or bottling plants. However, it is not particularly relevant to problems associated with recycling or recycling backwash effluents resulting from industrial filter backwash operations. Use of the method and apparatus of the present invention for treatment and recirculation of backwash liquids in combination with the DeLong method and system provides an effective and economical apparatus for industrial effluent treatment not available with prior art techniques. .

U.S. Patent No. Chapmam et al.
No. 3,592,743 discloses a system for treating industrial and domestic wastewater with a relatively high solids content, in which the wastewater is recycled to reduce water use. In particular, the Chapman et al. system is designed to be used in areas where available water supplies are limited and is being used in areas where wastewater disposal systems already exist and are in use. . The method and system disclosed by Chapman et al. do not involve the recirculation of treated backwash water similar to the method and system herein disclosed and are therefore fundamentally different in overall purpose and structure from that of the present invention. different.

Kirk, US Pat. No. 3,892,659, discloses a wastewater purification system in which wastewater and activated sludge are mixed in a receiving well from which the mixture is subsequently removed. Oxygen is then introduced into the mixture and the mixture is passed through a series of reaction stages. The mixture or solution is then split into two unequal streams, the main stream being recycled directly to the receiving well and the smaller second stream being directed to a clarifier from which activated sludge is removed. is recycled to the receiving well. Although Kirk's apparatus and method are used in the case of purified water recirculation, the particular apparatus and method are quite different from those of the present invention and are not designed for the treatment and recycling of backwash liquids. .

Besik's U.S. Pat.
A wastewater treatment system for wastewater recirculation combined with stage operations is disclosed. The method and apparatus of this patent is also quite different in overall purpose and arrangement from the method and apparatus of the present invention and does not involve treatment and recirculation of backwash liquid.

Accordingly, the present invention seeks to provide a new and unique method and apparatus for treating aqueous backwash effluent resulting from industrial filter backwash operations.

According to a preferred embodiment of the present invention, a method and apparatus for treating backwash effluent resulting from a backwash operation is disclosed. In this method and apparatus, industrial filters are cleaned by passing a water-based solution through the filter in a countercurrent to the direction of flow through the filter during normal overruns, and the backwash effluent resulting from the backwash operation is It is adapted to be directed through the backwash filter to remove solid materials that are washed out of industrial filters during backwash operations. Filtering the backwash effluent in this manner allows the backwash liquid or solution to be recycled and reused in subsequent backwash operations.

According to a preferred embodiment of the invention, the backwash filter comprises a diatomaceous earth filter, which is adapted to be supplied with diatomaceous earth in correspondence with the flow rate of the backwash effluent through the filter; be cleaned periodically to remove solid materials that have accumulated on the PH of backwash solution
Values and chlorination levels are maintained within optimal ranges to promote effective purification of industrial filters by the backwash liquid.

The industrial filter in an embodiment of the present invention is a filter used in an industrial water treatment method carried out in a bottling plant that produces bottled carbonated drinks. In this type of plant, both sand and carbon filters are commonly used to filter the water-based fluid through which the water-based fluid flows. Accordingly, the present invention provides that the same recycled solution is passed through a plurality of filters of this type in sequence through the backwash filters, and the backwash liquid or solution thus passed is then stored or stored. directed towards the holding tank;
Here it is stored until it is needed for the next backwash operation. Although the present invention is disclosed in connection with application to carbonated beverage bottling plants, it is applicable to industrial filters in many different types of equipment and to industrial filters used under a wide range of operating conditions and demands in a variety of industrial fields. Those skilled in the art will readily understand that it can be used in treating backwash effluent from commercial filters.

Accordingly, the main object of the present invention is to treat the aqueous backwash effluent resulting from a backwash operation so that the aqueous backwash effluent can be recycled for reuse in the next backwash operation. It is an object of the present invention to provide a new method and apparatus of the type.

Another object of the invention is to provide a backwash effluent of the type adapted to be passed through a backwash filter capable of removing particulate matter and solid matter expelled from industrial filters during backwash operations. An object of the present invention is to provide a method and apparatus.

Another object of the invention is to provide industrial filters that are cleaned and maintained in a clean state during backwashing operations;
Backwashing operations are assisted by a backwashing solution whose pH value and chlorination level are periodically adjusted to facilitate effective removal of particulate matter from industrial filters, particularly those used in beverage bottling plants. An object of the present invention is to provide a method and apparatus.

The foregoing and other objects and advantages of the method and apparatus for treating aqueous backwash effluents according to the present invention will be described in more detail below regarding the preferred embodiments in connection with the drawings of flow diagrams illustrating the apparatus constructed according to the present invention. It will be more readily understood by those skilled in the art upon reference to the detailed description.

A preferred embodiment backwash solution recirculation system is shown in the drawings, which also illustrates the method of the present invention. The carbonated beverage bottling plant is equipped with a settler 10, which acts as a sedation tank so that the various particulate matter contained in the liquid can settle and settle at the bottom of the tank.

During beverage bottling operations normally carried out in a plant, liquid from the precipitator 10 passes through pump inlet and outlet pipes or conduits 14 and 16 to a sand filter 18 and to a carbon filter 22 interconnected by a pipe 20. It is pumped out by the pump 12. The filtered fluid is then passed through pipe 24
to the purifier 26 to complete the filtration of the fluid. During overwork, the control valves 28, 30 and 32 located within the sand filter 18 are open so that liquid can be pumped downwardly through the filter as shown in the drawing, while the control valves 34 and 36 are closed. At this time, the control valves 38, 40 and 42 in the carbon filter 22
is maintained open during overwork, while valves 46 and 48 are maintained closed.

The sand and carbon filters 18, 22 should be cleaned periodically so that they are maintained in effective working condition, and this means that during overwork the filters are in a counter flow to the fluid that normally flows through them. This is usually done by backwashing by flowing a backwash liquid or solution through the backwashing process. Backwashing of the fluid through the filter releases and removes solids accumulated on the filter so that particulate matter and solids are released into the backwash effluent.

In typical prior art methods of this type, the effluent from the backwash operation is introduced into the general effluent discharge of the plant, resulting in a number of deleterious effects. Additionally, backwash liquids are very expensive because they are typically water-based solutions that are treated to maintain their alkalization and chlorination levels within predetermined parameters. Additionally, the discharge of backwash effluents can have an effect on the plant's waste treatment system due to the rapid volume of backwash solution introduced into the waste treatment system or the pulsation of the backwash solution and as the solution becomes chlorinated. resulting in overloading and significant amounts of solid and particulate matter being contained in the effluent.

In accordance with the present invention, the backwash effluent is directed via conduit 50 to a backwash filter 52 which is similar to industrial filters 18, 2.
Particulate matter and solids initially removed from 2 are filtered from the effluent. The purified backwash solution is then directed to a holding tank 54;
Here the solution is stored until the next backwash operation is performed. In the disclosed method and system, the same amount of water used during the backwash operation on sand filter 18 is reused during the backwash operation on carbon filter 22, and the same amount of water used during the backwash operation on sand filter 18 is used during the next cleaning of either of these filters. For reuse in
Alternatively, it may be stored in holding tank 54 for reuse in cleaning other additional filters according to the specific requirements and filter arrangement in the plant.

Industrial sand and carbon filters 18,2
2 are sequentially backwashed, one at a time.
Backwash valves 30, 32, 34 and 3 for filter 18
6 is in a reverse operating condition compared to its normal overworking condition, so that the flow of fluid through the filter is reversed and the backwash effluent is discharged into conduit 50 to backwash filter 52. Directed. The control valve 3 of the sand filter 18 is then returned to the normal overposition and the control valve 3 of the carbon filter 22
The states of 8, 40, 42, 48 are then reversed,
Fluid flow through carbon filter 22 is reversed. Backwash effluent from the carbon filter is discharged into conduit 50 which directs it to backwash filter 52. After completion of the backwash operation on both filters, the various control valves are returned to their positions to allow normal filtration through the industrial filters 18,22.

The flow of liquid through the filter during backwashing of the filter is maintained at 4°C above the rated flow rate of the filter by the media so that a significant amount of solids and particulate matter accumulated on the filter can be entrained and carried away. ~6 times larger. For example, if sand and carbon filters have a rated flow rate of 100 gallons per minute (0.379 m ³ /min) and are normally operated at this flow rate in a beverage bottling plant, the flow through these filters during backwashing operations is is 400 to 600 gallons/minute (1.51 to 2.27
m ³ /min). Backwash operations typically require 5 to 10
It takes place over a period of minutes. Following a backwash operation, the filter is typically recleaned for about 5 minutes and returned to its normal operating condition or normal overposition.

The backwash filter 52 may be a commercially available diatomaceous earth type filter in which the amount of diatomaceous earth material fed to the filter is a predetermined proportion of the flow of backwash effluent through the filter. Diatomaceous earth is fed into the filter via a suitable bench lily device. Some commercially available filters have a metal frame on which is provided a filter sheet on which diatomaceous earth is provided to form a coating. During cleaning these sheets are replaced and diatomaceous earth is precoated onto the new filters. During overworking, a gelatinous layer of solids accumulates as a coating on the filter, and the sheet with this accumulated solids is disposed of in the usual manner in solid waste disposal methods.

The PH value of the chlorinated backwash solution is maintained within the range of 4.0-5.0 to maximize the effectiveness of purification and to clean the sand filter 18 during the backwash operation. After overworking, sand filters typically become coated with lime precipitates, but the low PH value of the backwash solution helps remove lime particles. Also, the backwash solution is chlorinated because chlorine enhances the purifying action of the carbon filter in the low PH range in which the solution is maintained. The unit 58 for adjusting the PH value of the backwash solution is one of several commercially available units that operate in an automatic manner.
It's good to have one. Instead, a manual unit 58
may be used, in which case the PH of the backwash solution
is measured periodically and, if necessary, commercially available chemicals are added to the solution to adjust the PH value. Chemical supply unit 60 is adapted to maintain the chlorination level of the backwash solution within a desired range. This unit 60 may also be an automatic unit, or alternatively the adjustments may be made manually.

Although one apparatus for recirculating backwash solution has been disclosed herein in detail, particularly in connection with a carbonated beverage bottling plant, there are other methods and systems of a similar nature that fall within the scope of this invention. However, it will be apparent to those skilled in the art that alternative embodiments may be obtained.

[Brief explanation of the drawing]

The figure is a flow diagram illustrating an apparatus constructed in accordance with the present invention. 10... Precipitator, 12... Pump, 14, 16
... Conduit, 18 ... Sand filter, 20 ... Pipe, 22 ... Carbon filter, 24 ... Pipe, 26 ... Purifier, 28, 30, 32, 34,
36, 38, 40, 42, 46, 48... Control valve, 50... Conduit, 52... Backwash filter, 54
...Holding tank, 58 ...PH adjustment unit, 60
...Chemical agent supply unit.

Claims (1)

Claims: 1. A method for treating and recycling aqueous backflow resulting from a backwashing operation, wherein material captured by an industrial filter during normal overruns is removed from the filter and the backwashing A method in which the filter is adapted to be cleaned by passing a water-based solution through the filter in countercurrent to the flow passing through the filter during normal overworking, so as to be entrained in the effluent. (a) passing said backwash effluent through a backwash filter to remove material initially removed from said industrial filter during a backwash operation; and (b) following backwashing. A method comprising: preparing a water-based solution that has passed through the backwash filter for use in a backwash operation, and (c) using the water-based solution that has passed through the backwash filter in a subsequent backwash operation. 2. Passing the backwash effluent through the backwash filter comprises passing the backwash effluent through a diatomaceous earth filter, and periodically cleaning the diatomaceous earth filter. The method described in section. 3. The method according to claim 1 or 2, characterized in that the pH value of the water-based solution is adjusted. 4. The method according to claim 3, characterized in that the pH value is adjusted within the range of about 4.0 to 5.0. 5. A method according to any one of claims 1 to 4, wherein the industrial filter is an element of a production process in a carbonated beverage bottling plant. 6. Preparation for reuse is as described first above by (a) flowing the water-based solution through the second industrial filter in countercurrent to the flow through the second industrial filter during normal overworking; cleaning the second industrial filter in a backwash operation comprising backwashing the industrial filter followed by cleaning the second industrial filter;
(b) flowing the backwash effluent resulting from the backwash operation of said second industrial filter through said backwash filter to remove materials removed from said second industrial filter during the backwash operation; A method according to any one of claims 1 to 5, characterized in that: 7 The first mentioned industrial filter consists of a sand filter and the second mentioned industrial filter consists of a carbon filter.
The method described in section. 8. Process according to any one of claims 1 to 7, characterized in that the water-based solution is chlorinated in order to enhance the cleaning action in industrial filters. 9. Claims 1 to 8, characterized in that the water-based solution is transferred after passing through the backwash filter to a holding tank where it is stored in prepared form for reuse in the next backwash operation. The method described in any of the above. 10 An apparatus for treating and recycling aqueous backwash effluent resulting from backwash operations on industrial filters, comprising: (a) a holding tank 54 for storing a water-based solution used in periodic backwash operations; and (b) ) backwash filter 52 for removing materials from the water-based effluent flowing from industrial filter 18 during each backwash operation;
(c) a first conduit arrangement 16 for conducting a water-based solution from said holding tank to said industrial filters to perform a backwashing operation of each of said industrial filters; and (d) said backwash filters. (e) a second conduit arrangement 50 for directing the water-based effluent from the industrial filter 18 during each backwash operation to 52;
The water-based solution flowing from 2 is transferred to the above holding tank 5.
4. A third conduit device leading to 4. 11. The device according to claim 10, wherein the backwash filter 52 is a diatomaceous earth filter. 12 PH of water-based solutions used during backwashing operations
12. Device according to claim 10, characterized in that it comprises a device 58 for adjusting the value. 13. The device of claim 12, wherein the PH adjusting device 58 maintains the PH value within a range of about 4.0 to 5.0. 14. Claims 10 to 13, characterized in that it comprises a device 60 for chlorinating a water-based solution in order to enhance the effectiveness of the solution for cleaning the industrial filter 18 during backwashing operations. Apparatus according to any of paragraphs. 15 (a) a second industrial filter 22 undergoing a cleaning operation; and (b) a water base from said holding tank 54 to said second industrial filter for a backwashing operation of said second industrial filter. (c) said second industrial filter 22 during a backwashing operation;
(d) a fifth conduit arrangement for directing the water-based effluent flowing from the effluent to the above-mentioned backwash filter 52; Claims 10 to 14, further comprising a valve device for selectively directing through the second industrial filter 22 during backwashing operations. The device described.