Explain multistage series and parallel operation of trickling filters. Design a one stage high rate trickling filter to produce a bod effluent of 50 mgl. An introduction to trickling filter wastewater treatment plants. Intermediate rate filters can be loaded up to 64 kg bod 5100 m 3d 40 lb bod 5cu ftday. Trickling filters trickling filter is an attached growth process i. This packing material can be rock, gravel, sand and a wide range of plastic and other synthetic materials. Conventional trickling filter or ordinary trickling.
For example, it is a very economical and dependable process for treatment of wastewater prior to discharge. L21 and l22 trickling filter partiii hrtf environmental engineeringii 2. In most cases recirculation ratios are be tween one. Trickling filters are classified by hydraulic or organic loading, as highrate or lowrate. The flux rate is typically 520 gallons per minute per square foot gpmft2 and utilizes a proven distribution design to enable excellent hydraulic coverage during highrate operation.
The filter system is consist of a media bed in which wastewater is continuously distributed. It is not uncommon to load roughing filters at rates in excess. Wastewater technology fact sheet trickling filter nitrification. Trickling filteractivated sludge combinations for domestic. Comparison of standard rate trickling filter srtf and high rate trickling filter hrtf s. The spreadsheet will also calculate an estimated treatment efficiency for a specified single stage or. Trickling filters can be divided into different types mainly on the criteria based on the organic loading rates to the treatment plant system from low up to superhigh rate trickling filters. Consider recirculation ratio of 2 and filter depth of 1. Therefore, the bioreactor could meet the demand of industrial operation to resist. Trickling filter process calculations water chemistry.
Recirculation ratios volume of filtered sewage per volume of set tled sewage applied to the filter vary from 1. Ad wastewater first touches the filter medium, a porous substance that is usually cheap to purpose and has a large surface area. The average height of such trickling filter is 8 10m. High rate filters high rate filters are generally loaded at the maximum organic loading capabilities of the filter and receive total bod5 loading ranging from 64 to 160kgbod5100m3d40tol001b. If you feed alum or iron salts, and the piping is already in place, then this is a good place to begin. Highrate trickling filters are filled with plastic with a specific surface of 100230 m2m3. Describe the operational problems caused by various dissolved oxygen levels in both trickling filters and rbcs. Trickling filters are classified as high rate or low rate, based on the organic and hydraulic loading applied to the unit. Mar 24, 2014 what is a trickling filter trickling filter is a type of waste water treatment process, which is an attached growth process. Trickling filter nrc formula design calculations spreadsheet.
Calculate hydraulic loading rates for trickling filters. Since the power required in trickling filter per unit of bod removal is less as compared to asp, these are becoming popular these days. A trickling filter design calculations spreadsheet is partially shown in the image below. Pdf the modern trickling filter typically includes the following major. Introduction to trickling filters and rbcs study guide. Pdf trickling filter for high efficiency treatment of dairy sewage. L 20 high rate trickling filter linkedin slideshare. Advanced trickling filtration and rbcs study guide september 1995 edition. Because trickling filter technology has historically been used for municipal wastewater treatment, the design parameters found in the literature are based on. High rate trickling filters, including primary and secondary sedimentation, should, under. Packing material used in attached growth processes include rock, gravel, slag, sand, redwood, and a wide range of plastic and other synthetic materials. Comparison of plastic trickling filter media for the.
Results indicated that the distribution system has major effects on the trickling filter performance, and that radial jet nozzle increased bod removal ratio by. Calculate trickling filter recirculation ratio youtube. Trickling filters do not require a high level of sophisticated. Performance of biotrickling filters for hydrogen sulfide. May 27, 2017 high rate trickling filters hrtf when recirculation is used, the hydraulic loading per unit area of filter media is increased. With more than 500 trickling filter installations worldwide, brentwoods media and components have been optimized to guarantee the best performance for any application. The biological solids that slough from an intermediate trickling filter are not as well. High rate downflow, hrd the hrd sand filter offers high performance filtration and is used in difficult process applications. Highrate trickling filters, including primary and secondary sedimentation, should, under. For the most efficient operation, the deps facilities manual recommends that an optimal system should.
An introduction to trickling filter wastewater treatment. Pdf trickling filter and trickling filtersuspended growth process. A trickling filter is one of the first purifying processes that wastewater meets, and it works by producing slime and trickling water. Effect of distribution nozzles on trickling filter performance kamal t. Since the power required in trickling filter per unit of bod removal is less as compared. Jul 02, 2015 hii rajesh, trickling filter is an attached growth process i. Zoogleal film a complex population of organisms that form a slime growth on the trickling filter media and break down the organic matter in wastewater.
Describe the effect of algae growth on the media of a trickling filter and a rbc. Pdf the article presents the results of research on the possibility of using a trickling filter for high efficiency. Effluent form the first filter goes to the second filter, either directly or after passing through a clarifier. Trickling filter for high efficiency treatment of dairy sewage. In order to ensure good distribution and thorough blending of the filter and secondary effluent, the system should recirculate the trickling filter effluent. In case of high rate trickling filters the settled sewage is applied at much higher rate than for the low rate filter. Discuss the types of waste treated by a trickling filter and a rbc. Epa832f00015 september 2000 waste water technology fact sheet trickling filter nitrification description nitrogen is one of the principal nutrients found in wastewater.
In this process the microorganisms responsible for digestion are attached to an inert filter material. The snail management program you choose depends on your facilities setup. Introduction hydraulic as well as organic loading of high rate trickling filter is many times more than the low rate or standard rate trickling filter. Study 38 trickling filters 6 flashcards from jonathan f. Apr, 2014 a trickling filter design calculations spreadsheet is partially shown in the image below. Trickling filter, in wastewater treatment, a bed of crushed rock or other coarse media roughly 2 metres 6 feet deep and up to 60 metres 200 feet in diameter. Others may be able to isolate a few sections of rbcs or trickling filters and try d. The flux rate is typically 520 gallons per minute per square foot gpmft2 and utilizes a proven distribution design to enable excellent hydraulic coverage during high rate operation. Trickling filters 6 at red rocks community college. This is usually expressed as pounds of bod per day per cubic feet of filter medium or pounds of bod per day per acre foot. Conventional trickling filter or ordinary trickling filter. Many sewage treatment plants employ re circulation of filtered sewage as a means of increasing efficiency of treat ment. Two pilotscale trickling filters were constructed on field to evaluate the effect of radial jet nozzle and offset distance on the trickling filter performance.
Explain the purpose served by the media in a trickling filter and on a rbc. Trickling filter treatment solutions brentwood industries. The free space in the bed is 90 98% and the wet weight is 250 400 kgm3. A trickling filter tf is a wastewater treatment system that biodegrades organic matter and can also be used to achieve. Trickling filters can be divided into different types mainly on the criteria based on the organic loading rates to the treatment plant system from low up to super high rate trickling filters. Aerobic conditions are maintained by splashing, diffusion, and either by forcedair.
An introduction to trickling filter wastewater treatment plants course no. As the water migrates through the pores of the filter, organics are degraded by the biofilm covering the filter material. Trickling filter is a type of waste water treatment process, which is an attached growth process. As a result, higher flow velocities will usually occur causing a more continuous and uniform sloughing of excess growths. Roughing filters are basically high rate filters treating an organic load of more than 1. Effect of recirculation on trickling filter performance. High rate trickling filters are filled with plastic with a specific surface of 100230 m2m3. Presettled wastewater is continuously trickled or sprayed over the filter made out of rocks, gravel, plastic modules. This video covers the problems related with low rate trickling filters and how we can use high rate trickling filters to avoid these problems related to fly breeding, odour and ponding of filter. Types of trickling filters water treatment waste water. Introduction to trickling filters and rbcs study guide september 1995 edition. Aug 20, 2017 this video covers the problems related with low rate trickling filters and how we can use high rate trickling filters to avoid these problems related to fly breeding, odour and ponding of filter. This packing material can be rock, gravel, sand and a. A trickling filter tf is one of the oldest biological wastewater technologies that has been used for over 100 years.
Trickling filters sewage treatment reverse osmosis. High rate downflow, hrd the hrd sand filter offers highperformance filtration and is used in difficult process applications. What every operator should know about trickling filters. Westech engineers all trickling filter rotary distributors with two antifriction bearings designed for a life of over 30 years. Trickling filter classification and mechanism engineering. It can be used to calculate the trickling filter diameter needed for either a single stage or a two stage trickling filter system using the nrc formula. The high rate filters of modern advancements also function on the same lines and having the same construction detail but with the difference that provision is made in them for recirculation of sewage through the filter by pumping a part of the trickling filter effluent to the primary settling tank or the dosing tank of trickling filter and re. Trickling filters are classified by hydraulic or organic loading, as high rate or low rate. Highrate filters highrate filters are generally loaded at the maximum organic loading capabilities of the filter and receive total bod5 loading ranging from 64 to 160kgbod5100m3d40tol001b. The biological solids that slough from an intermediate trickling filter are not as well digested as those using a low rate filter.
The upper bearing supports all thrust loads exerted on. The trickling filter process see figure below is one of the oldest forms of dependable biological treatment for wastewater. By its very nature, the trickling filter has advantages over other unit processes. How to calculate trickling filter recirculation ratio see you on the site. The high rate filters of modern advancements also function on the same lines and. Q 10,000 m3d influent bod 400 mgl temperature t 20 oc primary sedimentation tanks will be used before the trickling filter solution to design trickling filter the following things should be found. This study attempted to increase the rate of nitrification by a pilot scale high rate trickling filter operated at the bethlehem sewage treatment plant. Because trickling filter technology has historically been used for municipal wastewater treatment, the design parameters found in the literature are based on typical municipal wastewater characteristics. High rate trickling filters hrtf when recirculation is used, the hydraulic loading per unit area of filter media is increased.
No parameters s r t f h r t f 1 hydraulic loading rate m 3 m 3day 14 1040 2 organic loading rate kg of 80dm 3day 0. Packing material used in attached growth processes include rock, gravel, slag, san. Outline the procedure for startup of a trickling filter. A trickling filter is a type of wastewater treatment system. Recirculation increases the efficiency of a trickling filter by increasing the time of contact of the ww with the biological slime growth on the filter media, and by washing off excess growths sloughing. Hochheimer fred wheaton, professor national committee for quality assurance biological resources engineering dept. It consists of a fixed bed of rocks, coke, gravel, slag, polyurethane foam, sphagnum peat moss, ceramic, or plastic media over which sewage or other wastewater flows downward and causes a layer of microbial slime to grow, covering the bed of media. Hii rajesh,trickling filter is an attached growth process i. Trickling filter is the most common choice of use in biological wastewater treatment plant. The rds1 trickling filter rotary distributor sets the standard, offering superior design and operational benefits over all other rotary distributors. The hydraulic wetting rate is the application rate of wastewater to the trickling filter, including recirculation, expressed as gal minft 2. High rate trickling filter waste water engineering youtube. Settled sewage is sprayed over the bed surface and is further purified as it trickles downward, coming in contact with filmy layers of microorganisms slime attached to the media. Achieving nitrification this fact sheet was developed by clement solomon, peter casey, colleen mackne, and andrew lake.
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