how to calculate rapid sand filter design


USA - Rapid Sand Filter Design Inputs Design a rapid sand filter to treat Q= 20000 m3/d Allowing filtered water for backwashing: Q_BW= 2% Time used for bakwashing per day = t_BW= 0.50 hours Assume the rate of filtration = 10 m/h Number of Filters 2.00 Length/ Width of Filters= 1.30 Depth of Sand Media= 1.00 m[...]

Lecture 5: Filtration - الصفحات الشخصية

Lecture 5: Filtration Dr. Fahid Rabah 1. 5. Filtration in water Treatment ... Most famous filters inwater treatment are Rapid Sand Filters. 8. 5. Filtration in water Treatment ... to calculate the backwash rate. 5. Filtration in water Treatment 27[...]

An Introduction To Slow Sand Filtration - Solutions for Water

Types Of Sand Filter 4 1.2.Rapid Sand Filters These filters use coarser sand than slow sand filters and the effective size of the filter media is usually greater than 0.55 mm. The flow rates are normally between 4 and 21 m/h equating to 400 to 2100 l/h per m2 of filter.[...]

Optimum expansion of sand filters during backwash

Experimental design for series 2 123 Table 4. Backwash procedures for graded sand 127 Table 5. Effluent quality index and porosity for series 2 142 Table 6. Head loss increases from run A to B, ... The backwashing of rapid sand filters has had years of experience,[...]

CIVL 1101 Introduction to Filtration 1/15 - Civil Engineering

Rapid Sand Filtration Filtration Type Application Rate m/hr gal/ft2-day Slow Sand 0.04 to 0.4 340 to 3400 Rapid Sand 0.4 to 3.1 3400 to 26,000 In rapid sand filtration much higher application velocities are used Filtration occurs through the depth of the filter A comparison of rapid and slow sand filtration is shown in the table below[...]

How to Calculate Head Loss | Hunker

How to Calculate Head Loss ... Assuming that each floor in the building represents 12 feet of height, you can calculate the head loss due to elevation and subtract it from the pump's output pressure anywhere in the building. ... application. For this dynamic example, assume that a swimming pool filter pump with 40 psi output pressure is pumping ...[...]

Sand Filter Design Example - doee

Appendix I. Sand Filter Design Example I.1 Sand Filter Design Example Data Required: ... # The distance is 50 feet from the sand filter’s invert-out to the storm sewer pipe connection ... Appendix I. Sand Filter Design Example 5. Calculate Submerged Storage Volume in Second Chamber[...]

Homework #7. Filtration - UMass Amherst

Consider the design of granular media filters for a water treatment plant with a design flow ... Calculate the clean bed head loss (in feet) for the filter using the Carmen-Kozeny ... If the entire filter depth was sand of the same size as the sand used in the dual[...]

Rapid Sand Filters - Water Treatment Process & Plant Design

The filter sand used in rapid sand filters is prepared from stock sand specifically for the purpose. Most rapid sand filters contain 60 to 75 cm thickness of sand, but some newer filters are deeper. The sand used as filter media in RSF is generally of effective size …[...]


6. Operate the equipment to filter the water leaving the sedimentation tanks. 7. Transfer treated water to the distribution lines. 8. Transfer the plant from standby power to the main power supply. 9. Trigger the appropriate controls to supply air and water to the plant. -7-[...]

Filtration - Alison Osinski

Rapid Sand Filters •Series of large tanks •Multiple layers of sand and gravel •Graded gravel provides uniform distribution of water and supports the sand •Depth filtration •Design flow rate: 1.5 - 5.0 gpm/ft2 (3.0 gpm/ft2) •Backwash rate: 12 - 15 gpm/ft2 •Each tank is backwashed independently •Filter aid or flocculants needed ...[...]

Pressure Sand Filters | Pune | India - Fluid System

These filters are the most popular method for removal of turbidity from water. The Pressure Sand Filter consists of a multiple layer of sand with a variety in size and specific gravity. These Filters are designed to remove turbidity and suspended particles present in the feed water with minimum pressure drop.[...]

HOMEWORK 3 Solution - Iowa State University

Below is just one of what could be a suitable solution. 1. a) Calculate the gross specific area (m2/m3) in a sand filter with sand nominal diameter 0.4 mm and porosity 0.4. ... 2. A dual-media rapid filter has 0.4m of sand and 0.4m of anthracite. Sand effective size 0.48mm, sphericity 0.9 and porosity 0.4. ... Design the sand filters to ...[...]

Slow sand filter - Wikipedia

The water produced from an exemplary slow sand filter is of excellent quality with 90-99% bacterial cell count reduction. ... Slow sand filters, due to their simple design, ... but as cities have grown they subsequently installed rapid sand filters, due to increased …[...]

How to Calculate Filter Size - YouTube

Dec 30, 2011· How to Calculate Filter Size ... NEW - Pool School - 09 - Swimming Pool Sand Filter PART 1 of 2 | Family Leisure - Duration: 8:16. Family Leisure Indianapolis 382,268 views. 8:16. How to Calculate ...[...]

Rapid Sand Filtration -

Standard design practice of Rapid Sand filter: Maximum length of lateral = not less than 60 times its diameter. Spacing of holes = 6 mm holes at 7.5 cm c/c or 13 at 15 c/c. C.S area of lateral = not less than 2 times area of perforations.[...]

Sandfilter - Lenntech

Sand Filtration by means of a sandfilter. Depending on the type of water, suspended solids concentration, oil and grease, COD/ BOD, iron contents, sand filters are sized differently, but the basic design data to clarify natural waters are the following:[...]

Multimedia (sand) Filtration Calculation - Lenntech

The above multi-media filtration calculator calculates the diameter of a round multi-media filter (MMF) based on the filter bed speed as input. ... than traditional sand filters before backwashing becomes necessary. For more information on filtration media (quartz sand, anthracite coal ... Molecular Weight Calculator. Design Characteristics for ...[...]

17 Rapid filtration Luiz di Bernardo -

17 Rapid filtration Luiz di Bernardo. Rapid filtration 17.1 Introduction ... by gravity-type rapid filters or by slow sand filters. In such cases, they can give excellent ... stability of multiple-layer filters is difficult to design and maintain, particularly after backwashing.[...]

Rapid Sand Filtration | SSWM - Find tools for sustainable ...

The construction cost of rapid sand filters is determined primarily by the cost of materials such as cement, building sand, gravel, reinforcing steel, filter media, pipes, and valves. However, the cost of land and transport of materials could add substantially to the total cost (UNEP 1998).[...]

Rapid Sand Filter | Environmental Engineering - YouTube

Jul 29, 2017· Rapid Sand Filter | Environmental Engineering ... Have discussed the working of rapid sand filters which is a type of gravity filters along with backwashing and the filter …[...]


What is filter backwashing? Most drinking water systems use filters to col-lect, catch, or gather particles from an incom- ... typical rapid sand filter. Photo by Chris Metzgar. P A G E O F F O U R ... tice to design for a maximum of 20 gallons per minute per square foot of filter area. For[...]

Filtration - MRWA

Filter Sand . The filter sand used in rapid sand filters is manufactured specifically for the purpose of water filtration. Most rapid sand filters contain 24-30 inches of sand, but some newer filters are deeper. The sand used is generally 0.4 to 0.6 mm in diameter. This is larger than the sand used in …[...]

BASIC POOL CALCULATIONS - Johnson County, Kansas

BASIC POOL CALCULATIONS . Step 1: Calculate Quantity of Water. Use the following formulas: Shape. ... Rapid Sand ; 3 . Cartridge .375 . Diatomaceous Earth : ... 3.1 square foot high rate sand filters . or. one 6.9 square foot high rate sand filter . OR. One 300 square foot cartridge filter .[...]

Design Examples -

Rapid Sand Filter Design. Problem: Design a rapid sand filter to treat 10 million litres of raw water per day allowing 0.5% of filtered water for backwashing. Half hour per day is …[...]

rapid pressurised sand filter design calculations

Backwash and Flow Rates of Filter Media – Pure Water ... how to calculate rapid sand filter design An overview of the flow rates of various filter media, including: activated alumina, anthracite, birm, calcite, corosex, filter Ag, garnet, granular activated carbon, KDF, KDF, manganese greensand, MTM, multimedia, pyrolox and sand.[...]

Sand filter - Wikipedia

Slow sand filter design. As the title indicates, the speed of filtration is changed in the slow sand filter, however, the biggest difference between slow and rapid sand filter, is that the top layer of sand is biologically active, as microbial communities are introduced to the system. The recommended and usual depth of the filter is 0.9 to 1.5 ...[...]

CHAPTER: 12 Filtration - Marmara Üniversitesi

a) single medium filters Example #1 : Headloss across a bed of uniform size particles Water at 20 0 C is passed through a bed of uniform sand at a filtering velocity of 5 m/hr.[...]

How do you calculate the appropriate flow rate ...

How do you calculate the appropriate flow rate (particularly when designing a non-standard biosand filter)? Design maximum hydraulic loading rate = Filtration Rate*Surface Area We recommend that the filtration rate through the sand be less than than 0.4 m 3 /m 2 /hr (or 400 liters per square meter of sand surface area per hour).[...]

FILTRATION - Environmental Protection Agency

3.4.2 recommended procedure for cleaning a slow sand filter 16 3.4.3 recommended procedure for resanding a slow sand filter 16 4 rapid gravity and pressure filtration 19 4.1 rapid gravity filtration 19 4.2 pressure filtration 19 5. process considerations 23 5.1 rapid gravity filter media 23 5.2 operational criteria 24 5.2.1 filter layout 24[...]


Design Criteria Description Unit Design Criteria Design Flow Max. Flow (5000 m3/day) (7500 m3/day) 1. Rapid Mixing - Time sec 1 to 3 2.17 1.45 - G - Value sec-1 500 to 700 612 1100 - GT 1328 1595 2. Flocculation Basin - Type Baffle Channel Baffle Channel Baffle Channel ... Sand 0.55 - 0.65[...]

Selection of optimum filtration rates for sand filters

The early rapid sand filter systems were proprietary devices, the first one patented by I. W. Hyatt in 1884. A number of others were on the market in the mid 1890's when 0. W. Fuller was retained by the Louisville Water Company to test the suitability of rapid sand filters for the treatment of Ohio River water at Louisville, Kentucky.[...]

wt Chapter 6 - School of Civil & Environmental Engineering ...

A city is to install rapid sand filters downstream of the clarifiers. The design loading rate is selected to be 160 m3/(m2 d). The design capacity of the water works is 0.35 m3/s. The maximum surface per filter is limited to 50 m2. Design the number and size of filters and calculate the[...]

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