DE3000503A1 - Recycling backwashing effluent from filters - in beverage and bottling plants, for further use following filtering, in adjustment and re-chlorination - Google Patents

Abstract

Aq. effluent resulting from backwashing filters is filtered, pH-adjusted, rechlorinated and then recycled for further backwashing operations. Recycling the backwash soln. reduces chemical wastage and prevents waste treatment plant overload. Used for backwashing sand and carbon filters used in beverage and bottling plants.

Description

Process and facility for treatment and repatriation

an aqueous backwash drain from a backwash process.

The invention relates generally to a method and a system for Treatment of the backwash effluent obtained from a backwash operation, which is carried out on an industrial filter. In particular is the invention directed to a method and a system in which or in which a backwash filter is used to backwash drainage of solids and other contaminants to clean that came off the industrial filter during the backwashing process having the obtained treated and purified backwashing liquid for use is returned in subsequent and repeated backwashing operations.

With many systems for filling beverages into bottles, like them Industrial filters of the sand and coal type are currently in use the industrial processes that are carried out in them. These Sand and carbon filters are periodically or cyclically using a backwash process cleaned, during which time a water-based solution or a liquid through the respective Filter in a countercurrent direction with reference on the flow through the filter during a normal filtering process will. The backwash process is intended to remove any solids and particulate matter Remove material from the industrial filter in order to make the latter in an effective way To maintain operating condition.

Usually a backwash requires the use of a large one Volume of water and during this process will be varying amounts of severe Solids detached and as a result from the industrial filter for removal released from this.

A typical backwash of this type will turn the drain off the backwashing process emptied into the total drainage drain of the system, what a whole number has adverse effects. This is e.g. the backwashing liquid often quite expensive as it can consist of a water-based solution that Has been treated with expensive chemical additives to reduce their pH and chlorination levels to keep within certain parameters in order to achieve their maximum sterilizing properties Therefore, emptying the backwash drain leads to lending during backwashes in the total drainage drain of the system and thus its one-time use for Reaching out a rather expensive treated backwash liquid, welo This often makes the process uneconomically expensive Often diverting the backwash drain into the facility's waste treatment system too very high and occasionally sudden demands on this system. The waste treatment system is heavily or suddenly loaded as a result of the large amount of backwashing liquid, which is used in the process and is lost because the solution is chlorinated and entails significant amounts of solids and particulate matter leads that undergoes a backwash from the industrial filter It Various types of systems are already known whose function is recovery and reuse of the backwash water is known in these Systems made no attempt to either control or regulate the heavy solids that are released from the industrial filter during the backwashing process. Furthermore, the known systems are not concerned with optimizing the backwashing process in that the chlorination and acidity or pH values of the backwash liquid aif maintained at a level that is most effective in backwashing performance would lead. The present invention would therefore be an excellent use in conjunction with U.S. Patent Application 832,283 to DeLonge, referring to a Method and plant for the treatment of aqueous waste materials and the The discharge of bottle filling machines and systems is directed. The DeLonge procedure and system is particularly concerned with the elimination of biological oxygen demand from the waste materials and is also on the treatment of the four different Directed types of drain emptying of a beverage or bottling plant, however, not particularly the problems associated with recovery or recycle of backwash drain obtained from backwashing an industrial filter, are connected. The application of the method and the plant according to the invention for the treatment and recycling of the backwashing liquid in combination with the process and the system in the latter US patent application would be effective and result in an economically viable facility for the treatment of industrial effluents, which has not yet been revealed or received attention.

U.S. Patent 3,592,743 to Chapman and coworkers describes a system for treating industrial and Household sewage with a relatively high solids drop at which the wastewater is recycled is used to reduce water use. In particular, the Chapman system is intended for use in areas where the available water supply is fairly low and waste disposal systems are already in place and in Use are. The methods and systems disclosed by Chapman are fundamental completely different from the overall purpose and structure of the method according to the invention and systems, since the Chapman system does not rely on the recycling of treated backwash water as directed in the invention.

In U.S. Patent 3,892,659 to Kirk there is a sewage treatment system described at what wastewater and activated sludge in a receiving basin are added from which the admixture is then withdrawn later.

Oxygen is then introduced into the admixture and the latter is passed through a series of contained reaction stages. The admixture or the solution is then divided into two unequal streams, one of which is the main stream is returned directly to the receiving basin, while the second stream of lesser Volume is directed to a clarifier # from which the activated sludge is returned to the receiving basin. The arrangement disclosed by Kirk and his Process is used in the recycling of purified water, however is the particular arrangement and method entirely different from those of the invention and not intended for the treatment and recovery of backwashing liquid.

U.S. Patent No. 4,008,159 to Besik describes a wastewater treatment system for the recirculation of wastewater, which is a four-step process for carrying out the successive removal of various impurities present in the water includes. This patent is also completely different from the Overall objectives and arrangement in the method and system according to the present invention, as it does not describe the treatment and recycling of backwashing liquid.

Through the invention, a method and was novel and for the first time a system for treating the aqueous backwash drainage created from a backwash of an industrial filter is obtained.

A preferred embodiment of the invention is a method and a system for treating the backwash effluent resulting from a backwash process is obtained in which an industrial filter is cleaned by a Water-based solution through the filter in countercurrent flow with respect to the direction of flow is passed through the filter during normal filtration, and at which the backwash drain obtained from the backwash process through a Backwash filter is passed to remove solid materials from the Industrial filters are rinsed during the backwash process. Filtering the backwash drain in this way enables the backwash liquid or solution to be recovered and reused for subsequent backwashes.

According to a preferred embodiment of the invention, the backwash filter is a diatomaceous earth filter, which with diatomaceous earth material corresponding to the extent of Flow of backwash effluent through the filter is filled, the filter periodically is cleaned to remove any solid materials that have accumulated in this have to remove. The pH and degree of chlorination of the backwash solution are kept within optimal ranges for effective cleaning of the industrial filter by means of to favor the backwashing liquid.

In the inventive embodiment described, the industrial filter is one used in an industrial water treatment process disclosed in a bottling line for the production of bottled carbonated Drinks is carried out.

In a plant of this type, both sand and Carbon filter used to filter water-based fluids that flow through it and accordingly, sequential backwashing is one of the present invention Number of filters of this type treated with the help of the same recycled Solution provided. During the recycle process, the backwash drain is passed through a Backwashing filter passed and the backwashing liquid filtered in this way or solution is then passed to a storage or holding tank and held in this, until there is a need for this in a subsequent backwash process. Although the Invention related to its application to a carbonated bottling line Drinks is described, can be recognized by those skilled in the art that by teachings given by the invention for treating backwash drainage from industrial filters in many different types of situations and under largely different ones Operating conditions and requirements used in various fields of industry can be.

A main object of the invention is to provide a novel method and a novel system of the aforementioned type for the treatment of the aqueous backwash drain to a wrap obtained from a backwash so that the drain can be returned for reuse in subsequent backwashing processes.

Another object of the invention is to provide a method and to develop a system of the type described, in which the backwash drain is passed through a backwash filter which serves to remove particulate matter and to remove solid materials that come off an industrial filter during a backwash process.

The object of the invention also includes a method and a Develop a system for a backwashing process with the help of a backwashing solution to support whose pH value and degree of chlorination are periodically adjusted, to effectively remove particulate matter from an industrial filter to facilitate backwash cleaning and sanitary conditions sustains, especially when used for beverage bottle systems.

In the following the invention is based on a preferred embodiment explained in more detail in connection with the accompanying drawing, the only figure of which shows a flow diagram of a plant according to the invention.

In the drawing is a preferred embodiment of a backwash solution recycle system shown, from which the method according to the invention can also be derived. A carbonated beverage bottling line comes with a precipitator 10 equipped, which serves as a settling tank, so that different particulate Materials that are entrained in the liquid settle and settle on the bottom of the tank.

Typically, when bottling a beverage made in the system is running, liquid from the precipitation tank 10 with the help of a Pump 12 through pump inlet and outlet pipes or lines 14 and 16 to one Sand filter 18 and additionally pumped to a carbon filter 22 which filters through pipes 20 are connected to each other. The filtered fluid is then passed through a pipeline 24 to a polishing or cleaning device (polisher) 26 to the filtering process of the fluid to complete. During the filtering process, the rule is; valves 28, 30 and 32 in the sand filter 18 are opened to allow the liquid to pass through the filter are pumped as shown in the drawing, while the control valves 34 and 36 remain closed. During this time in the carbon filter 22 are the Control valves 38, 40 and 42 open during the filtering process, while the valves 46 and 48 are held in a closed state.

The sand and carbon filters 18 and 22 must be cleaned periodically to keep them in an effective working condition, which is usually done with the help of a backwashing process occurred in which a backwashing liquid or solution through the filter in countercurrent to the direction of flow in which the fluid is normally flows through the filter during a filtering process.

The backwashing of fluid through the filters has the consequence that in these accumulated or agglomerated solids are loosened and displaced # what the Discharge and entrainment of pebbles and solids in the backwash drain leads.

In a typical known process of this type, the drain emptied from the backwashing process into the discharged total drain of the system, resulting in a number of adverse effects. Also is the backwash liquid often quite expensive as it is usually a water-based solution, which is treated to keep its degree of alkalinization and chlorination within certain limits Parameters to hold.

Furthermore, the discharge of the backwash drain leads to an overload, which affects the waste treatment system of the facility, because of the swelling or sudden large amount of backwash solution emptied into them and further since the solution is chlorinated and has significant amounts of solids and particulates Material.

According to the invention, the backwash drain is closed through a line 50 passed a backwash filter 52, which is used to remove the particulate from the drain Filter out and remove material and solids that are initially have been removed from the industrial filters 18 and 22. The purified backwash solution is then directed to a holding tank 54 in which the solution is stored, until a subsequent backwash process takes place. With the procedure and the system as described, the same amount of water as it is used during the sand filter 18 was used during the backwash process reused on the carbon filter 22 and then in the holding tank 54 in preparation for their Reuse in subsequent cleaning of one of these filters or possibly additional filter according to the special requirements for the filters and their arrangement is saved in the system.

The industrial sand and carbon filters 18 and 22 each become one consecutively backwashed. During a backwash of filter 18, the operating conditions of valves 30, 32, 34 and 36 are reversed compared to those in a normal filtering process, which has the consequence that the fluid flow through the filter is reversed and the backwash drain in the line 50 is discharged to thereby the Drain to the backwash filter 52 to direct. The control valves in the sand filter 18 are then in their normal filtering positions returned and the operating conditions of the control valves 38, 40, 42 and 48 in Carbon filters 22 are then reversed so that fluid flow through the carbon filter 22 is reversed. The backwash drain from this is discharged into line 50, which it leads to the backwash filter 52. After the backwashing process is complete at both filters, the various control valves are returned to the positions which allow normal filtering through the industrial filters 18, 22 during the backwashing process A filter is the flow of liquids through it four to six times greater than the intended flow rate for this filter, depending on the Medium so that a considerable amount of the solids and particulate matter Materials that or

that has accumulated in the filter, displaced and carried along in a State to be carried away. For example, if the sand and charcoal filters have set flow rates of 380 liters (100 gallons) per minute and normally in the beverage bottles '' filling line operated at this flow rate is during the backwashing process the flow through these 1515 to 2270 liters (400 to 600 gallons) per minute to to make the cleaning effect of the backwash process as high as possible. A backwash is usually carried out for a period of 5 to 10 minutes. After the backwash process the filter is backwashed for a period of time generally about 5 minutes to return it to its normal operating state, Bring deho back to the normal filtering position.

The backwash filter 52 can be a commercially available diatomaceous earth filter be the diatomaceous earth via a suitable Venturi arrangement (not shown) is supplied in such a way that the amount of diatomaceous earth material, that is fed to the filter is in a certain proportion to the flow of the backwash drain is through this.

A commercially available filter can have metal frames on which Filter surfaces are arranged, the diatomaceous earth having a coating on the filter surfaces forms.

During the cleaning process, the surfaces will and will be replaced the new filters pre-coated with diatomaceous earth. During the filtration process A gelatinous layer of solids builds up as a coating on the filters on and the surfaces are together with the accumulated solids in a way as is common in solid waste disposal processes.

The pH of the chlorinated backwash solution will be within the range kept from 4.0 to 5.0 for their sterilizing efficiency and when cleaning of the sand filter 18 so high during the backwashing process carried out on it to do as possible. After a filtration process, the sand filter becomes common coated with a kind of lime deposit and the lower pH of the backwash solution contributes to the elimination of the lime particles. The backwash solution is also chlorinated, since chlorine has the sterilizing effect of the carbon filter in the low pH value range, in which the solution is held, favors. A unit 58 for adjustment the pH of the backwash solution can be one of several units available in the resin that work in an automatic manner.

If necessary, a manually operable unit 58 can be used in which the pH measurements of the backwash solution are made periodically and, if necessary, commercially available chemicals can be added to the Solution can be added to adjust its pH.

A chemical feed unit 60 is used to feed the chlorination 9 to keep the backwash solution within a desired range0 which unit can also be an automatic unit or possibly a unit, in which the setting is made by hand.

The foregoing has only provided an arrangement for recycling the backwash solution described in more detail, in particular in connection with a bottling plant for carbonated drinks.

The invention is of course not limited to this, but can have experienced numerous modifications and other uses within their scope Blank page

Claims (15)

Claims: 1. A method for the treatment and recycling of an aqueous Backwash drain obtained from a backwash operation in which a Industrial filter is cleaned by passing a water-based solution through the Filter is directed in countercurrent to the flow passing through the filter during a normal filtering process so that the filter during the normal filtration process, trapped material is displaced by this and by a Backwash flow is carried along, characterized in that (a) that the backwash drain is passed through a backwash filter to remove the material that was initially removed from the industrial filter during the backwash process; (b) the water-based solution, which has passed through the backwash filter for use in a subsequent one Backwash is treated; and (c) in subsequent backwashes the water-based solution is used, which is passed through the backwash filter has been. 2. The method according to claim 1, characterized in that the passing through of the backwash drainage through a backwash filter in such a way that the Backwash drain is passed through a diatomaceous earth filter and the latter one undergoes periodic cleaning. 3. The method according to claim 1 or 2, characterized in that the pH of the water-based solution is adjusted. 4. The method according to claim 3, characterized in that the pH is set to a range within about 4.0 to 5.0. 5. The method according to one or more of the preceding claims, characterized in that the industrial filter is a component of an industrial Process in a bottling plant for carbonated beverages. 6. The method according to one or more of the preceding claims, in which the treatment for reuse is characterized by (a) a second industrial filter is cleaned in a backwash process, in which the Water-based solution through the second industrial filter in countercurrent to the current is passed through the second filter in a normal filtering process, the cleaning of the second industrial filter following the backwashing of the first-mentioned industrial filter is performed and (b) the backwash effluent from the backwash process of the second Industrial filter is passed through the backwash filter to remove the material, which is displaced from the second industrial filter during the backwashing process 7, method according to claim 6, characterized in that the first-mentioned industrial filter a sand filter and the second industrial filter is a carbon filter 8. Procedure according to one or more of the preceding claims, characterized in that the Water-based solution is chlorinated in order to have the sterilizing effect in the industrial filter to favor. 9. Method according to one or more of the preceding claims, characterized in that the water-based solution after passing through the backwash filter to a holding tank for storage in preparation for their reuse is promoted in a subsequent backwash process 10 Appendix for treatment and recycling an aqueous backwash effluent from backwashes at a Industrial filter, characterized by (a) a holding tank (54) for storage and Store a water-based solution suitable for use in periodic backwashes suitable is; (b> a backwash filter (52) to remove material from the Water base runoff coming from the industrial filter (18) during each backwash emanates; (c) a first conduit (16) for conveying the water base solution out of the Holding tank to the industrial filter for performing each backwash of the industrial filter; (d) a second conduit (50) for directing the water base effluent from the industrial filter (18) flows out during each backwash, to the backwash filter (52); and (e) a third line for conducting the water base solution emerging from the backwash filter (52) flows out during each backwash, to the holding tank (54). 11. Plant according to claim 10, characterized in that the backwash filter (52) is a diatomaceous earth filter. 12. Plant according to claim 10 or 11, characterized by a device (58) to adjust the pH value of the water-based solution used in the backwashing process. 13. Plant according to claim 12, characterized in that the device (85) to adjust the pH value, the pH value within the range of approx Holds 4.0 to 5.0. 14. Plant according to one or more of claims 10-13, characterized by means (60) for chlorinating the water base solution in order to increase the efficiency the solution when sterilizing the industrial filter (18) during a backwash process to support. 15. Plant according to one or more of claims 10-14, characterized by (a) a second industrial filter (22) subjected to a cleaning process will; (b) a fourth line for conducting the water base solution from the holding tank (54) to the second industrial filter for backwashing the second Industrial filters; (c) a fifth conduit for directing the water base drain, the flows from the second industrial filter (22) during a backwash to the Backwash filter (52) and <d) a valve arrangement which enables the water-based solution optionally through the first industrial filter (18) during a first backwash process and through a second industrial filter during a second backwash to direct.