Slide 1

Design of Arraba Waste Water Treatment Plant

Prepared by:Waleed RahhalHamed DaghlesSaleh Abdel-Rhman

Supervised by:Abdel Fattah R. Hasan, Ph.D.Numan Mizyed, Ph.D, PE.Jan, 2013

An-Najah National UniversityCivil Engineering DepartmentProject 2presentation

1Outline1.Objectives2.Why WWTP?3.Background4.Impact of engineering solutions (WWTP)5.Site selection of WWTP.6.Population Analysis and design Flow7.Design of WWTP.8.Design of TF model.9.Detailed Design of WWTP.10. Reuse of treated wastewater.11. Conclusion and Recommendations.

2Objectives Predict waste water flow of Arraba.Design waste water treatment plant for Arraba.Design a model of T.F.Decide on optimal reuse of treated wastewater .

3Treatment of waste water, in addition to strong management will enhance the public health and environmental.why wastewater treatment plant? There are no sewage collection system, or WWTP.

Arraba town is an agricultural area, so the treated waste water can be used.

Due to shortage of water resources.

4Impact of engineering solutions (WWTP)Economical aspects: - It offers many jobs. - New water resource will be available. - The resulted sludge could be used as fertilizers. 5Other aspects: - Protect the human health, from many diseases - Reduce the pollution of groundwater. - People satisfaction on local government will increase.

Background - Arraba is located about 13 km southwest of the city of Jenin- Population around 12,000 people - Rising about 340 m from sea level

Arraba

18-20 oCR H60 %

580 mm6Site selection for WWTP Multiple Decision Criteria Method was used to determine the site location.

1. At the North of Arraba (Yabd street)

2. At the south east of Arraba

3. At the west of Arraba

7LocationAttributes123Need for system ofpumps1.750.750.25Ownership of landto the municipality0.100.000.00Accessibility to site0.450.350.25Distance fromresidential areas0.700.300.90The possibility offuture expansion0.900.300.90Service the treated water for neighboringfarmland1.801.401.40Social acceptance 0.900.100.70Ability to contact with other municipal 0.900.1000.10Total7.503.304.50

1. At the North of Arraba (Yabd street)8what is Trickling Filter?Trickling filters are biological treatment process. The most widely used design for many years was simply a bed of stones.

9Why is Trickling filter ?In deed, Trickling filter System has been working on it in many countries , but have not been applied in Palestine, so it is a chance to apply it and stand on its effectiveness,

Also it have a lot of advantages as follow:

1. Simple, reliable, biological process.2. Low operation cost and technology.3. Durable process elements

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Population Analysis and design FlowConstant compounding model was used to determine the population at the design period, which equal 25 years- Pop. =11153(1+0.025)25= 20,677 c.11- Wastewater generation = 80%.- Q peak = 4944 m3/day.

- Q Design = Q peak + Q i/I , where Q i/I = 5% Q peak .So, Q Design = 5191.2 m3/day (0.06 m3/sec). Peak factor =14 (P)-1/6 =2.67 used 3 for safety.- Water consumption = 100 L/c.d

12Design of WWTPHow do we treat wastewater ?

Secondary treatment

Preliminary treatmentPrimary treatmentTertiary treatment

13Design of WWTPBased on American methodUnits of WWTP are :

Coarse screen : The major objectives of screen is to remove large objects such as rags, paper, plastics, metals

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2. Fine screen: it aims to remove objects that pass through coarse screen.

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3 mm bar screen in order to remove (87-93) % of solid material3. Grit chamber: it remove sand, gravel, broken glass, egg shells, to protect moving mechanical equipment and pumps from unnecessary wear and abrasion16Surface area (m2)Length (m)Width (m)Depth(m)93.62.52.4

4. Primary sedimentation tank: Wastewater Sedimentation Tank plays an important role either after or before biological treatment processes to remove heavier sludge solids by means of settling and separation from the liquid phase.17Rectangular sedimentation tankLength (m)Width (m)Depth(m)Detention time(h)21.57.243

175. Trickling filter Double stage TF system with R = 2E1=E2T.F 1T.F 2Diameter (m)31.515Depth (m)1.51.5BOD load (Kg/m.d)1.381.59Hydraulic load (m/m.d)0.0130.057186. Secondary sedimentation tank

19Secondary sedimentation tankLength (m)Width (m)Depth(m)Detention time(h)258.344Design of TF modelQ = 5 L / hr.BOD = 500 mg / L.Diameter = 45 cm.Total Depth = 1m.R = 2. QR = 10 L / hr. 20

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parameterLow-RateIntermediate-RateHigh-RateHigh-RateRoughingHydraulic loading,m3/m2.d1-44-1010-4010-7540-200Organic load,Kg BOD/m3.d0.07-0.220.24-0.480.4-2.40.6-3.2>1.5Recirculation ratio00-11-21-20-2Depth, m1.8-2.41.8-2.41.8-2.43-12.20.9-6Filter mediaRock, gravelRock, gravelRock, gravelplasticplasticEfficiency of BOD removal, % 80-9050-8050-9060-9040-70Power, KW/103m32-42-86-106-1010-20

22Detailed Design23General Layout

NThis layout will ensure the following points:Optimal utilization of spacesEasy movement between units during maintenance and cleaning .The Min. number of pump station, and power neededThe pumping station was placed after the primary sedimentation tank, in order to protect the pump from unnecessary wear and abrasion24The profile of the plant25

Drawing one ( Channel, screen, grit chamber )26

Cross Sections:27

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Design of parshall Flume29Parshall Flume: the most common flow measuring devicesthe flume is favored over other methods because:It will pass a wide variety of solids.Flow rate can be determined manually or automatically.It has low maintenance.

Drawing two ( primary sedimentation tank, pump station)30

Pump station ( two pumps, one stand by )Q for each pump = 108m3/h.h = 14m + 10% other loss = 15.5mEfficiency 70% , shaft power = 6.47 KW.Drawing three ( Trickling filter one, Trickling filter two)31

Section in Trickling filter one

32Section in Trickling filter two

Design pumps for recirculationTrickling filterQ (m3/h)h +10%losses(m)EfficiencyShaft power (KW)T.F1216 m3/h8.2570%6.93T.F2216 m3/h2.6570%2.15T.F3216 m3/h7.770%4.53T.F4216 m3/h7.770%4.53Drawing four (secondary sedimentation tank )33

Section in secondary sedimentation tank

Drawing five ( Storage tank) 34

Section in storage tank

Reuse of treated wastewater 35 Based on the amounts of treated wastewater that will be available at the proposed plant and crop consumptive use of crops proposed, it will be possible to irrigate about 366 donums if no seasonal storage is utilized. growing season starting from March to the end of November for most vegetables grown in the area. When greenhouses are utilized, vegetables are grown all year round including winter.

farmers depend mainly on rain water, it is accumulate in two main valleys: 1. "Annos valley" is located at half of the plain, 2. "Algrab valley Located southeast of Arraba.Study area36The planted area in Arraba is about 45,000 donum which are distributed into the following categories:1) 1,000 donum as irrigated area.2) 30,000 donum as planted with rain fed vegetables and field crops area.3) 5,000 donum as an area planted with olives.Proposed crops:Fodder crops such as alfalfa will be safely irrigated with treated wastewater and farmers there are familiar with such crop which is demanded by local markets. Tropical fruits such as citrus, and mangos,Other fruits such as grapes, and apples.And, tobacco, grass and olive trees could also be irrigated by treated wastewater.3737Estimation of crop water requirement:Climate variables ofjenin from PMA(BeitQad station) shownin the following table:

38SunshineHoursWindKm/dayHumidity%Max TempCMin TempCMonth5.41808017.46.8January5.61908418.27.1February6.81907621.68.6March7.81906728.311.2April9.72166031.014.0May11.32266332.917.3June11.12336333.619.6July10.02066534.221.1August9.11736433.219.8September8.11306530.616.1October6.81466625.011.8November5.41807418.88.7December8.11886927.113.5Average39The climate in Arraba is characterized by cold wet winters and dry hot summers.The average monthly precipitations of the Arraba area are shown below:

MonthRain (mm)January107February62March65April25May6June0July0August0September0October16November40December93Total41440MonthAlfalfaCitrusGrapesMangoTobaccoGrassAverageJanuary20341544274431February63401751555146March34602677987762April5289391227611783May6811551171015293June134128922060175123July1841301522150183144August1691191511970168134September1421011271660142113October1057694118010583November7554667807558December5138335105338Annual sum1097984863149625613421008 Monthly evapotranspiration (ET) in mm Crop water demand in mm41MonthAlfalfaCitrusGrapesMangoTobaccoGrassAverageJanuary0000000February2000000March00015391512April3273171156010968May73129531950172104June1581511092430206145July2171531792530216170August1991401782320198158September1681191501960168134October1057192120010582November4217314504230December0000000Annual sum9968538091414991231903Water demand Vs. Water supply:42Average monthly precipitation vs. average monthly evapotranspiration (ET) shown in the following plate:

43Monthly irrigation demand:For treated wastewater generation, annual average was estimated at 2074 m/day. Considering seasonal variations of wastewater production, a peak summer flow of 4944 m/day is expected from Arraba WWTP.So, we have two option for irrigation which are:Option 1) If no seasonal storage option (with water spill) was utilized, then the area that could be irrigated will be about 366 dunums. Option 2) If no spill option is to be utilized, then the area that could be irrigated will increase to be about double.No seasonal storage:44Influent flow rateInfluent flow rateAverage irrigation demandIrrigation demandWater excess/spillMonthm3/daym3/monthmm/monthm3m3January1660514600051460February1660464800046480March20746429412544958845April207462220683087631344May2074642941044722217072June249074700145658398861July249077190170771900August249077190158717415449September207462220134608441376October207464294823723327061November207462220301362248598December1660514600051460Average207563169753416829000With seasonal storage:45MonthInfluent Flow ratesInfluent Flow ratesAverage irrigation demandIrrigation demandWater excess/deficitExpected storage in reservoir by end of monthm3/daym3/monthmm/monthm3m3m3January1660514600051460141845February1660464800046480188325March20746429412931854976243301April20746222068528009420252721May20746429410480753-16459236262June249074700145112589-37889198373July249077190170132000-54810143563August249077190158122683-4549398070September207462220134104048-4182856242October20746429482636716230November20746222030232953892538925December166051460005146090385Average2075631697558430Annual24894758022903701157Conclusion and recommendations New WWTP was designed. The treatment method was Trickling filter.There is a potential for reuse the treated wastewater. We recommend the following :Environmental impacts assessment.Detailed design for the treatment plant to prepare final drawing, bids and bill of quantities.Need to look for funding sources to fund the projectPublic awareness program.

46Thank You47