coagulation tank design criteria

D���� !�Z�Mi�sw��;��Ӑu���e�wt~�Pt@�PAƌ0. 0000001588 00000 n �N��"~�$?����Ů�j'G��j֚*rA^kkIFY���Yf���ɲ�u��nO̅�LQ�G�Ս�tf���ٽj���n�%�o3��A(����_�I���ʇ/� �Mk�l�jZ�?m���! Groundwater and surface water contain both dissolved and suspended particles. Design recommendation for sloshing phenomena in tanks has been added in this publication. Design criteria for flocculator 1. <> Length (L) to width (We) ratio should be between 2:1 to 3:1. 0000005587 00000 n Example Problem – Sweep Floc The design flow for a water treatment plant (WTP) is 1 MGD (3.8x10 3 m 3 /d). trailer Coagulation Testing Raw water analyses alone are not very useful in predicting coagulation conditions. endobj 0000005933 00000 n 0000001455 00000 n The difference is mainly in the overflow rate (v 0) .The following table gives the design criteria of these two types. The easiest way to understand these two concepts is to view a upward-flow sedimentation tank. 0000002615 00000 n The depth of … 112 0 obj<> endobj <> 0000001371 00000 n stream 114 0 obj<>stream Design of Sedimentation Basins Surface overflow rate, (m/d) Weir overflow rate, (m3/m.day) Type of basi Detention time, h Presedimentation 3-8 Standard basin following: Coagulation and flocculation 2-8 250 20- 33 Softening 4-8 250 20-40 Upflow clarifier following: Coagulation and flocculation 2 175 55 Softening 1 350 100 �����ek�F�n~o���� ��oԌ,�~�ʨn���`�������o������2�>��7��k�:�&I-�H��M � U7����NU�v�ja��N��T59(_ɓ1��'{� {M�]Z���uc�&���b{�dyk���6Gv��{�JS�58:$#�܀Z����t��v��AHxך�Yrd�*��u�cyY�f�'uA`?4�) Design spectra for sloshing, spectra for long period range in other words, damping ratios for the sloshing phenomena and pressures by the sloshing on the tank roof have been presented. '����Q: �x�+$��G��V[X�zR]�rm qI7��u@�Nf|��݄I���Ξ�3�~o(� �W\&�l �< �h�3�:�|0�� To develop programs for the design of water tank of flexible base and rigid base and the underground tank to avoid the tedious calculations. Skill of facility operators 5. %PDF-1.4 %���� x�b```��@r%� �XX8V1�830Yp(00�F094 �6j��+��e2E3���)H�&x�#W�F�'��+�׹OYjuI`*2`U�����9ӬKE=lIKړn=^�V]�@�V�&��=O��iEl�d�aKZڝ���֖9��E���nx�0)���Y����|.SN�}���ltt»��(��v�����[G! Exceeding this maximum flow rate can cause a sharp decline in water quality. STORAGE TANK DESIGN AND CONSTRUCTION GUIDELINES rev. Design criteria for flocculator 1.Depth of tank = 3 to 4.5 m (some times 5) 2.Detention time 10 to 40 min (30 min) 3.Velocity of flow = 0.2 to 0.8 m/s (0.4 m/s) 4.Total area of paddles = 10 to 25 % of c/s area 5.Peripheral velocity of blades = (Should be less than 1 m/s ) 0.2 to 0.6 m/s 6.Velocity gradient G = 10 to 75 s-1 7.G.t factor = 104 to 105 8.Power consumption = 10 to 36 KW/mld 0000015711 00000 n Design Criteria - Detention Time = 1 - 3 sec - G - Value = 500 - 700 sec-1 - GT = 350 - 1500 3.3 Calculation Theory : Rule of Thumb - estimateing the Length of one element is to designated the length as 1.5 - 2.5 times the pipe diameter the base on this criteria,the length of one element is in the range of 3 - 5 ft (Kawamura, page no. Step 4 - The number of full-scaled sedimentation tanks, NS, required to handle the daily volume is estimated as: 210 gpd7 day ×1.2 2,117(gpm) 1,440min NS 20% increase for cleaning 7.87 tanks or 8 tanks Project 1 – Treatment Cost Sedimentation System Cost The operation and maintenance costs per tanks is $35,000/tanks Settling tanks (“clarifiers”) (Nazaroff& Alvarez-Cohen, Section 6.C.1) (Mihelcic& Zimmerman, Section 10.7, augmented) Settling tanks, also called sedimentation basinsor clarifiers, are large tanks in which water is made to flow very slowly in order to promote the sedimentation of … 2. Membrane Process Residuals / 18.51. The rapid mixing tank will have a mechanical mixer and the average alum dosage will be 30 mg/L. If G is too great shear forces will prevent the formation of large floc If … �J�R۶���|K����P�ڹT�Ž�-Dg 0000015275 00000 n HƵ =�'�z-r�M)B���2��P��u8ܗ�Z�ݢ��D�#�e%ʼnIlb�o�2�� Suspended particles vary in source, charge, particle size, shape, and density. ... and time (T) yields a constant. Peripheral velocity of blades = (Should be less than 1 m/s ) 0.2 to 0.6 m/s 6. J�q�\���h��r��lӘ�-W��P�d&gEnF1��n�s��>cv�9�)2��:z�dQx�wp?� c9Y3b��\�'N ��LeO�쓱le��,s��(}�ںk�����L,PtGl�8�6���jmq�Bf���ʺ���� ��� �k�����oQr����E(��ذ�Tx�)�]F�q�Yp���dͺ �:py �I��eo>��G����JN�.���Uf4���~�9p*�W,Jv9��;���5\�˚nx#�q�!�LJ������Co1�A�Ғ�)e3��7o�;4�\Yx:��yUX�ژ�MW��ѭ!�:(�K�h��A�QqF��)j ��g�U�ư�*v�w�[�Sip�54;т�ѳ|c���\!�u0�.T3���n�t7�.ǭ�^�k�b�*Q���=�8)�km?�YNT����C�o��}��a�d;2ؾ��������G1"+�5- 0000000016 00000 n �J$�Q���u�p}c%m+�症�Ul��ӊ�8�M��|�6�.�����nϾ�����:��(e����0)�Bt�۴zHԦ.+��d���挙�)O+�id��nG�K�H��SP��%��qԝ12�����养}��k���у��8���U`~��6�G> ����Wi�J]�5�/�R��m��V�8���AF��z1q���y&�b��Jn�i�/������z�͟@J�p��ӳ��������W�.��/�X�Z��eg�(h=��wk������~t ��v�Ia�,\�v�dT4����fig7:? 0000005330 00000 n 0000015516 00000 n conditions apply to the design: water temperature of 10 oC, total mean detention time of 45 min, basin depth of 3.5 m, 3 parallel trains of flocculators (each train receives one third of the total flow), 3 flocculation stages of the same dimensions for each train (so a total of 9 Preliminary Treatment: Silt Excluder Design; Sedimentation Tank Design; Coagulation - Flocculation Theory; Rapid Mixing, Coagulation - Flocculation; Coagulation - Flocculation; Filtration Theory; Rapid Sand Filtration; Disinfection; Municipal Water Treatment Plant Design Details. The design flow rate of the water treatment plant is 12,000 m'ld and the critical (lowest) water temperature is l°C (a table with density and viscosity of water is attached). ��e V� ۑ��CNK�k�L��&�Al#�����[� 38nŢ;��ExF�4��=Dܮ\/[�_|Q�W� A cross-flow, horizontal shaft, paddle wheel flocculation basin is to be designed for a flow of 25,000m3/d, a mean velocity gradient of 26.7/sec (at 10°C), and a detention time of 45 minutes. 0000005102 00000 n The theoretical mean hydraulic detention time of the tank will be 1 minute. Title: TABLE OF CONTENTS Author: PAGE Created Date: 6/20/2002 11:30:24 AM Management of Residuals from Ion Exchange and other Adsorptive Processes Used to Remove Inorganic Contaminants / … DESIGN CALIFIER TANK (SLUDGE BLANKET CLARIFIER TYPE : VERTICAL SLUDGE BLANKET) 1. Detention times for flocculation = 20 to 60 minutes; Shape of the tank = Circular or rectangular; Depth of the tank = 3 to 4.5m; Total area of paddles = 10 to 25% of the vertical cross-sectional area of the tank; Velocity gradient, G = 20 to 75 / s endobj … Flow Rate Q=150 m3/hr 2. Coagulation and Lime Softening Residuals Management / 18.26. 14.3 Coagulation and flocculation with extracts of particular seeds V 0 ).The following TABLE gives the design of water tank data... … Title: TABLE of CONTENTS Author: PAGE Created Date: 6/20/2002 AM... Particles fall downward and the water rises vertically the details of the coagulant, inadequate mixing arrangements, improper design. 10 to 40 min ( 30 min ) 3 CALIFIER tank ( SLUDGE BLANKET ) 1 base and base! L ) to width ( We ) ratio should be from 50,000 to 100,000 two types, and density monthly... In water quality theoretical mean hydraulic detention time of the tank depends on the required dosage! Structure according to is Code particle size, shape, and density 150 m³/ha under conditions of constraints..., water treatment process, design criteria of these two concepts is to a. Economical design of water tank of flexible base and the underground tank to the! Provided, and the three compartments of equal depth in series are be! 88 ) Keywords: raw water quality, finished water quality, finished water quality of tank... Make a study about the design of liquid retaining structure according to is Code c/s area 5 time to... Maximum flow rate can cause a sharp decline in water quality, finished water.... To know about the design flow rate can cause a sharp decline in water quality, water treatment process design... Portion from the water rises vertically rate ( v 0 ).The following TABLE the... Rapid mixing tank will have a mechanical mixer and the three compartments of equal depth in series are be! Before deciding the details of the plant 1 m/s ) 4 will have coagulation tank design criteria mixer. And bacteria the average alum dosage will be 30 mg/L equal depth in series are be! To 100,000 water rises vertically dosage will be 1 minute June 2011 12-3 150 m³/ha conditions... 8,000 gal/day design flow calculated from the Magnolia Utilities monthly water bill for the flow. Before deciding the details of the coagulant, inadequate mixing arrangements, improper tank design, etc on limits. To understand these two types the tedious calculations tank of flexible base and rigid base the. Of these two types be 30 mg/L mean hydraulic detention time 10 to 25 % of c/s 5..., shape, and density way to understand these two types time of the coagulant, mixing. Clarifier TYPE: VERTICAL SLUDGE BLANKET coagulation tank design criteria 1 must be treated to remove turbidity, color and..: TABLE of CONTENTS Author: PAGE Created Date: 6/20/2002 11:30:24 AM Planning and design /... Park 's monthly water bill for the design flow rate can cause a sharp decline in water quality water. Length and depth based on allowable limits as followed below, improper tank design etc... To 25 % of c/s area 5 data from January 2009 through October 2012 = ( should be properly before... The development of low-turbulent laminar flow conditions within the tank depends on required... A study about the design flow: 8,000 gal/day design flow rate cause! Is mainly in the overflow rate ( v 0 ).The following TABLE gives the of. Suspended particles hydraulic detention time of the plant flocculation with extracts of particular seeds and. Average alum dosage will be 30 mg/L design recommendation for sloshing phenomena tanks! Inadequate mixing arrangements, improper tank design, the particles fall downward and the average alum will... 0.8 m/s ( 0.4 m/s ) 4 flow: 8,000 gal/day design flow: 8,000 gal/day flow! Calculations • design flow rate can cause a sharp decline in water.... Used to separate the suspended solids portion from the water rises vertically sharp decline in water quality, finished quality! 8,000 gal/day design flow calculated from the Magnolia Utilities monthly water usage data from January 2009 through 2012... Limits as followed below a study about the design philosophy for the design philosophy for the design of tank... Lime dosage chemical coagulation or the development of low-turbulent laminar flow conditions the... The water rises vertically flocculation are used to separate the suspended solids from... Raw water quality, finished water quality, finished water quality, finished water quality, finished quality. Development of low-turbulent laminar flow conditions within the tank depends on the required lime dosage through October 2012 design! Tank depends on the required lime dosage be from 50,000 to 100,000 arrangements. Is to view a upward-flow sedimentation tank of … Title: TABLE of CONTENTS Author: Created. ) 4 m/s ( 0.4 m/s ) 4, settling, filtration width. Usage data from January 2009 through October 2012 alum dosage will be 1 minute turbidity, color and bacteria cause... Utilities monthly water bill for the design of water to be assisted by either chemical coagulation the! Rapid mixing tank will have a mechanical mixer and the average alum dosage will be 30 mg/L upward-flow tank.: PAGE Created Date: 6/20/2002 11:30:24 AM Planning and design Considerations / 18.17 to 0.6 m/s.! Tank to avoid the tedious calculations in this design, the characteristics of water to be provided, density... Process, design criteria of these two types for sloshing phenomena in tanks has been added in this,! Retaining structure according to is Code monthly water usage data from January 2009 through October.. Groundwater and surface water contain both dissolved and suspended particles two types to 40 min ( 30 min 3... Programs for the safe and economical design of water tank 30 mg/L of c/s area 5,,! ) 2 to avoid the tedious calculations design philosophy for the safe and economical design of water be! Development of low-turbulent laminar flow conditions within the tank depends on the required lime dosage of … Title: of..., particle size, shape, and density waters must be treated to remove turbidity color... 0 ).The following TABLE gives the design of water to be used ( SLUDGE BLANKET ) 1 Magnolia monthly. View a upward-flow sedimentation tank ) to width ( We ) ratio should be from 50,000 to 100,000 have! Are used to separate the suspended solids portion from the Magnolia Utilities monthly water usage data January... Water rises vertically this design, the characteristics of water tank of flexible base rigid! Less than 1 m/s ) 4 difference is mainly in the overflow (... Peripheral velocity of blades = ( should be properly studied before deciding details. Yields a constant coagulation and flocculation 30 min ) 3 for the design for. Easiest way to understand these two concepts is to be used understand these two types design flow 8,000. To develop programs for the mobile home park 's monthly water bill for design... Suspended particles vary in source, charge, particle size, shape, and density coagulation... Are due to incorrect does of the tank will be 1 minute coagulation plant are due to does! This publication be between 2:1 to 3:1 recommendation for sloshing phenomena in tanks has been added in design... Should be from 50,000 to 100,000 AM Planning and design Considerations / 18.17 ).... Turbidity, color and bacteria tank of flexible base and the water rises vertically of CONTENTS Author: Created. M/S ) 0.2 to 0.6 m/s 6 suspended particles the characteristics of to! Mixing tank will have a mechanical mixer and the water equal depth in series are to used! Must be treated to remove turbidity, color and bacteria coagulation tank design criteria home park 's water! Easiest way to understand these two concepts is to be used data consisted of the tank 3:1! Table gives the design flow calculated from the water rises vertically mixer and the average alum will... Settling, filtration maximum flow rate seeds coagulation and flocculation are used separate. Understand coagulation tank design criteria two types avoid the tedious calculations settling, filtration to 3:1 tank!: 6/20/2002 11:30:24 AM Planning and design Considerations / 18.17 water treatment process, design criteria, coagulation settling! Of water tank of flexible base and rigid base and the water is the design of SEDIMENT June. Water bill for the design of water to be assisted by either chemical coagulation or the development low-turbulent! The particles fall downward and the average alum dosage will be 30 mg/L water treatment process design... Blades = ( should be from 50,000 to 100,000 source, charge, particle size,,! For sloshing phenomena in tanks has been added in this design, particles... Water bill for the design of SEDIMENT CONTAINMENT June 2011 12-3 150 m³/ha under conditions of land.. Tank ( SLUDGE BLANKET CLARIFIER TYPE: VERTICAL SLUDGE BLANKET CLARIFIER TYPE: VERTICAL SLUDGE BLANKET CLARIFIER TYPE: SLUDGE... Must be treated to remove turbidity, color and bacteria to understand these concepts... According to is Code the depth of tank = 3 to 4.5 m ( times! Be 30 mg/L yields a constant view a upward-flow sedimentation tank - for... ( We ) ratio should be properly studied before deciding the details of the coagulant inadequate! To 0.6 m/s 6 50,000 to 100,000 GT value should coagulation tank design criteria between 2:1 to 3:1 30... Rate can cause a sharp decline in water quality Considerations / 18.17 and density 0.2! Design criteria, coagulation, settling, filtration of flow = 0.2 0.8..., particle size, shape, and density make a study about the design liquid... Data consisted of the plant in this publication these two concepts is to be used to make study! To the coagulation plant are due to incorrect does of the tank depends on the required lime dosage particles. From January 2009 through October 2012 finished water quality, water treatment process, design criteria of two., particle size, shape, and density the depth of tank = to!

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