WOM Wastewater Management project

993 views
832 views

Published on

Published in: Technology
0 Comments
1 Like
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total views
993
On SlideShare
0
From Embeds
0
Number of Embeds
0
Actions
Shares
0
Downloads
11
Comments
0
Likes
1
Embeds 0
No embeds

No notes for slide

WOM Wastewater Management project

  1. 1. WATER SERVICES AND SYSTEMS MANAGEMENT 1 8 0 R i v e r s i d e A v e n u e , M o u n t H o p e , T r i n i d a d Telefax: 1.868.638.2548 - Mobile: 1.868.319.0214 - e-mail: w ssmltd@gmail.com WASTEWATER MANAGEMENT PROPOSAL PROJECT: WORLD OUTREACH CHURCH MINISTRIES 17 MORNE COCO ROAD, PETIT VALLEY - TRINIDAD Prepared and Calculated by JEFFREY A. JAMES Dip Pl Cr, Dip Env. Mgmt. MTPATT October 2013
  2. 2. WSSM P L U M B I N G WORLD OUTREACH CHURCH MINISTRIES WASTEWATER MANAGEMENT PROPOSAL ©WSSM Ltd - 2013 a TABLE OF CONTENTS 1.0 INTRODUCTION 1 2.0 ESTIMATED POPULATIONS 2 3.0 WASTEWATER MANAGEMENT STRATEGY 2 4.0 WASTEWATER MANAGEMENT SYSTEMS 5 4.1 Conder Environmental Solutions Techflo SAF 5 4.1.1 Process and Plant Description 6 4.2 Disinfection 7 4.3 WWTP Seeding 8 4.4 Septic Tank System 9 4.4.1 Septic Tank 9 4.4.2 Soakaway Pit 9 4.5 Laundry 11 5.0 KITCHEN SINK 11 5.1 Grease Trap 12 Tables 1 ESTIMATED PEAK POPULATIONS 2 2 DAILY WATER CONSUMPTION PER STRUCTURE 3 3 DAILY WASTEWATER DISCHARGE PER STRUCTURE 4 4 PERMISSIBLE LEVELS COMPARISON 6 5 CALCULATIONS FOR SEPTIC TANK SYSTEM 10 6 GREASE TRAP CALCULATIONS 12 Figures 1 WWTP Process Flow diagram 7 2 Double Compartment Septic Tank 9 3 Kitchen Sink to Grease Trap Process Flow diagram 11 4 50lb capacity Grease Trap 12 Appendices Plant loading Profile i - ii Composition of Domestic Wastewater iii Water Pollution Rule iv Specifications for UV Units v - viii
  3. 3. WSSM P L U M B I N G WORLD OUTREACH CHURCH MINISTRIES WASTEWATER MANAGEMENT PROPOSAL ©WSSM Ltd 1 1.0 INTRODUCTION The WORLD OUTREACH CHURCH MINISTRIES proposes to develop a MULTI- BUILDING COMPLEX on 1.054 Hectares of land at 17 MORNE COCO ROAD, PETIT VALLEY and this building development will consist of the following structures with the intended utilization :  All Purpose Hall o Church Sanctuary/Cultural Centre o Accommodation for visiting Pastors o Security  Hostel o Hostel Accommodation  Mini Mart/Food Court o Supermarket o Cultural/Training Centre This report shows the Wastewater Management concepts, components and mitigating measures to be implemented to ensure that Wastewater generated from this proposed development will not negatively impact the surrounding natural and built environments.
  4. 4. WSSM P L U M B I N G WORLD OUTREACH CHURCH MINISTRIES WASTEWATER MANAGEMENT PROPOSAL ©WSSM Ltd 2 2.0 ESTIMATED POPULATIONS The estimated peak populations for the various structures are projected to be as follows in Table 1: ESTIMATED PEAK POPULATIONS STRUCTURE VISITORS STAFF POPULATION 1 All Purpose Hall 340 Church Sanctuary/Cultural Centre 300 20 Accommodation for visiting Pastors 8 2 Security 10 2 Hostel 60 Hostel Accommodation 50 10 3 Mini Mart/Food Court 62 Supermarket 20 6 Cultural/Training Centre 30 6 TOTAL POPULATION 462 Table 1 3.0 WASTEWATER MANAGEMENT STRATEGY In order to effectively and efficiently manage both Black and Gray Wastewater Discharges from the various structures within the Complex, we propose to utilize as indicated in Table 3: Three (3) independent Wastewater Management systems I. two (2) Conder Environmental Solutions - Techflo SAF 35 II. one (1) Septic Tank/Soakaway According to WASA’s GUIDELINE FOR DESIGN AND CONSTRUCTION OF WATER AND WASTEWATER SYSTEMS IN TRINIDAD AND TOBAGO, Water Consumption [Table 2.1, pp11] and Wastewater Flow [Table 3.1, pp18] will be based on the TYPICAL (Litre per day) CONSUMPTION AND DISCHARGES
  5. 5. WSSM P L U M B I N G WORLD OUTREACH CHURCH MINISTRIES WASTEWATER MANAGEMENT PROPOSAL ©WSSM Ltd 3 DAILY WATER CONSUMPTION PER STRUCTURE USER UNIT AMOUNT TYPICAL (LPD) CONSUMPTION TOTAL CONSUMPTION (LPD) All Purpose Hall Church Sanctuary/Cultural Centre Seat 300 15 4500 Employee 20 83 1660 Accommodation for visiting Pastors Guest 8 150 1200 Employee 2 75 150 Security Employee 10 50 500 Water Consumption for All Purpose Hall (lpd) 8,010 Hostel Hostel Accommodation with Laundry Facilities Guest 50 150 7500 Employee 10 75 750 Water Consumption for Hostel Accommodation with Laundry Facilities (lpd) 8,250 Mini Mart/Food Court Supermarket Person 20 6 120 Employee 6 50 300 Cultural/Training Centre/Food Court with Kitchen Seat 30 15 450 Employee 6 75 450 Water Consumption for Mini Mart/Food Court with Kitchen (lpd) 1,320 Total Water Consumption for World Outreach Ministries (lpd) 17,580 Table 2
  6. 6. WSSM P L U M B I N G WORLD OUTREACH CHURCH MINISTRIES WASTEWATER MANAGEMENT PROPOSAL ©WSSM Ltd 4 Table 3 DAILY WASTEWATER DISCHARGE PER STRUCTURE STRUCTURE UNIT AMOUNT TYPICAL (LPD) DISCHARGE TOTAL DISCHARGE (LPD) WASTEWATER MANAGEMENT SYSTEM 1 All Purpose Hall Conder Environmental Solutions - Techflo SAF 35 Church Sanctuary/Cultural Centre Seat 300 12 3600 Employee 20 60 1200 Accommodation for visiting Pastors Guest 8 120 960 Employee 2 60 120 Security Employee 10 40 400 Wastewater Discharge (black and grey water) from All Purpose Hall 6,280 Litres per Day 2 Hostel Conder Environmental Solutions - Techflo SAF 35 Hostel Accommodation with Laundry Facilities Guest 50 120 6000 Employee 10 60 600 Wastewater Discharge (black and grey water) from Hostel 6,600 Litres per Day 3 Mini Mart/Food Court Septic Tank/Soakaway Pit Supermarket Person 20 5 100 Employee 6 40 240 Cultural/Training Centre/Food Court with Kitchen Sink Seat 30 12 360 Employee 6 60 360 Wastewater Discharge (black and grey water) from Mini Mart/Food Court 1,060 Litres per Day
  7. 7. WSSM P L U M B I N G WORLD OUTREACH CHURCH MINISTRIES WASTEWATER MANAGEMENT PROPOSAL ©WSSM Ltd 5 4.0 WASTEWATER MANAGEMENT SYSTEMS 4.1 CO N D E R ENV I R O NM E NT A L SO L U T I O NS TE C H FL O SAF is a packaged sewage treatment plant is designed to treat domestic wastewater. Domestic Wastewater is essentially the spent or used water from the complex, emanating from personal, sanitation and domestic uses. The effective reduction of the organic material entering the Sewerage Treatment Plant is accomplished biologically through millions of microorganis ms (bacteria). These bacteria degrade wastewater through the addition of atmospheric oxygen and biochemical reaction. This plant will utilize Submerged Aerated Filter (SAF) technology for optimum performance and dependability , it is designed to manage 7m3 (7,000 litres) per day, including laundry waste, (grey water from the Kitchen passes through a static Grease Trap then to the Storm Drainage system). Using reliable, cost effective and energy efficient blowers for aeration with an integral flow management system, the TechFlo SAF 35 will be installed completely below ground. Anticipated Influent Loadings IN F LU E NT WA S TE W A TE R BOD - 280M G /L Designed in accordance with the British Water Code of Practice for Flows and Loads, this Packaged Sewage Treatment Plant offers treatment which surpasses the local Specifications for Liquid Effluent from Domestic Wastewater Treatment Plants into the Environment (Inland Surface Waters) as indicated in the WATER POLLUTION RULES 2001, Second Schedule (Table 4). In an effort to maintain the integrity of the system, we will allow for a ninety (90) day desludging frequency, to ensure that the quality of the discharged liquid effluent meets and surpasses all permissible levels as required.
  8. 8. WSSM P L U M B I N G WORLD OUTREACH CHURCH MINISTRIES WASTEWATER MANAGEMENT PROPOSAL ©WSSM Ltd 6 PERMISSIBLE LEVELS COMPARISON No. WATER POLLUTANTS PERMISSIBLE LEVEL OR CONDITION (mg/l) DISCHARGE FROM TECHFLO SAF (mg/l) JUSTIFICATION Parameters or Substances Inland Surface Water 1 Temperature 35o C 27o C This plant discharges liquid effluent at 3oC above Ambient Temperature 2 Dissolved Oxygen Content (DO) <4 1 - 3 Air introduced in the Biological Treatment Zone increases aeration whilst stabilizing DO 3 Hydrogen ion (pH) 6 - 9 6.7 Appendix i. Case Study - Table 1 4 5 day Biological Oxygen Demand (BOD5 at 20o C) 30 14 Appendix i. Case Study - Table 1 6 Total Suspended Solids (TSS) 50 12 Appendix i. Case Study - Table 1 7 Total Oil and Grease (TO&G)or n- Hexane ExtractableMaterial (HEM) 10 DNA Data Not Available 8 Ammoniacal Nitrogen (NH3-N) 10 9 Plant reduces 80% Influent Ammoniacal Nitrogen - 41.5 (mg/l) 12 Total Residual Chlorine (Cl2) 1 0.02 Appendix i. Case Study - Table 1 28 Feacal Coliforms 400 428 Appendix i. Case Study - Table 1, NOTE: UV reduces 95% of Feacal Coliforms Table 4
  9. 9. WSSM P L U M B I N G WORLD OUTREACH CHURCH MINISTRIES WASTEWATER MANAGEMENT PROPOSAL ©WSSM Ltd 7 4.1.1 Process and Plant Description The Treatment Process – Submerged Aerated Filter Technology The unit is specifically designed to treat domestic sewage and other biodegradable waste and c omprises three treatment stages: Figure 1 - WWTP Process Flow diagram The system utilises microorganisms to break down the sewage by processes very similar to those that occur in a garden compost heap. It is very important therefore, that toxic chemicals do not enter the system and "poison" the microorganisms. Raw sewage is first received in the Primary Settlement Stage, where gross solids (primary sludge) separate in the tank. These solids remain until the tank is "de -sludged" as described in the MAINTENANCE section of this manual. The “settled” liquor is displaced from the Primary Tank and flows into the biological treatment zone. Incoming flow mixes with recycled sewage within the bio zone. This recycled flow greatly dilutes the incoming sewage and prevents "shock" loads from upsetting the system. The blower provides necessary oxygen for the micro -organisms to digest the nutrients in the bio -zone. Air is bubbled up through the bio-zone from distribution pipework and in so doing generates a recirculating flow. As the liquid moves around in the bio zone it is purified by the microorganisms growing on the surface of the media. Excess biomass solids are transferred to the humus tank or final settling tank by displacement, as new liquor enters the bio - zone from the primary tank.
  10. 10. WSSM P L U M B I N G WORLD OUTREACH CHURCH MINISTRIES WASTEWATER MANAGEMENT PROPOSAL ©WSSM Ltd 8 The Humus solids settle to the top and bottom of the Humus tank to form sludge. This sludge remains in the tank, until the tank is ‘de-sludged’. The fully treated liquid displaced from the humus tank is known as Final Effluent. 4.2 DI S IN FE C T I O N Ultraviolet technology is the most common and preferred method of disinfection which is currently used on most wastewater treatment plants. The process involves using an ultraviolet (UV) lamp which transfers electromagnetic energy from a mercury arc lamp to the organism's genetic material (DNA and RNA). When UV radiation penetrates the cell wall of an organism, it destroys the cell's ability to reproduce. UV radiation, generated through an electrical discharge through mercury vapor, penetrates the genetic material of microorganisms and retards thei r ability to reproduce. The effectiveness of a UV disinfection system depends on the characteristics of the wastewater, the intensity of UV radiation, the amount of time the microorganisms are exposed to the radiation, and the reactor configuration. For any one treatment plant, disinfection success is directly related to the concentration of colloidal and particulate constituents in the wastewater. The main components of a UV disinfection system are mercury arc lamps, a reactor, and ballasts. The source of UV radiation is either the low-pressure or medium-pressure mercury arc lamp with low or high intensities. Even though this effluent is suitable for discharge to a watercourse , we propose an additional t ertiary treatment by way of a SALCOR MODEL 3G UV WASTEWATER DISINFECTION UNIT. Not only will this unit allow for disinfection for total inactivation/destruction of any existing pathogenic organisms to further ensure the prevent the spread of waterborne diseases to downstream users and the environment, it also capable of Feacal Coliform reduction of 99.9%. 4.3 WWTP SE E D I N G The proposed WWTP(s) will require a seeding/stabilisation period which will allow for the development of an adequate population of micro -organisms (bacteria) within the WWTP to make the treatment system operate efficiently. We intend to achieve this by impo rting Activated Sludge from one of our functioning Septic Tanks, to initiate the process. Based on intended population and utilization, we propose a Seeding Period of six (6) weeks. During this period all Final Effluent will be directed by way of a valving system to Outfall Holding Tanks as a mitigating measure, these Outfall Fall tanks will be desludged using Septic Trucks every other day or when required during the seeding process, this effluent will be taken to WASA’s Wastewater Management Plants for pro cessing.
  11. 11. WSSM P L U M B I N G WORLD OUTREACH CHURCH MINISTRIES WASTEWATER MANAGEMENT PROPOSAL ©WSSM Ltd 9 4.4 SE P T IC TA N K SY S TE M (STS) A Septic Tank System will consist of a Septic Tank, Soakaway Pit and the surrounding soil into which wastewater is finally disposed. 4.4.1 Septic Tank A Double Compartment S eptic Tank with a capacity 2175 litres will be used in this application in order to manage both Black and Gray Wastewater. The anticipated daily Wastewater Discharge from the Mini Mart/Food Court is 1060 litres; therefore the proposed Septic Tank will be large enough to hold the volume of wastewater collected in two (2) days. To ensure optimum operation and functionality of the Septic Tank, we will institute a desludging frequency of 180 days Figure 2 - Double Compartment Septic Tank 4.4.2 Soakaway Pit A Soakaway is a simple stone filled pit where the efficiency depends on the porosity of the ground. A percolation test was carried out at four (4) locations on this site, these test revealed that it takes approximately 3 minutes for Water Leve l to fall 25mm which proves that the Rate of Percolation is excellent. The effluent from the septic tank will be able to soakaway into the surrounding soil via the sidewalls of the pit. As the effluent seeps through the surrounding soil, a process of natural purification occurs. This process includes the breakdown of the polluting material by bacteria occurring naturally in the soil, and the eventual “die o ff” of the pathogens.
  12. 12. WSSM P L U M B I N G WORLD OUTREACH CHURCH MINISTRIES WASTEWATER MANAGEMENT PROPOSAL ©WSSM Ltd 10 Table 5 shows Design Justification for STS components CALCULATIONS FOR SEPTIC TANK SYSTEM Mini Mart/Food Court Daily Wastewater Flow 1060 Litres Septic Tank Note: Minimum Double Compartment Septic Tank Capacity 2.175 m3 Required Septic Tank Capacity 2175 Litres Required Septic Tank Capacity 2.2 m3 Proposed Septic Tank dimensions Total Length 2.25 M Width 1.25 M Liquid Depth 1.5 M Proposed Septic Tank Capacity 4.22 m3 Proposed > Required 91% Soakaway Pit Percolation Rate Time for Water Level to fall 25mm 3 minutes Required Absorption Area 0.027 m3 /m2 /d Total Daily Wastewater Flow 1060 Litres Total Daily Wastewater Flow 1.06 m3 Required Absorption Area 40 m2 Proposed Soakaway Dimensions Length of Side Wall 4.5 M Depth of Side Wall 2.25 M Number of Walls 4 no. Proposed Soakaway Dimensions 40.5 m2 Proposed > Required 1% Table 5
  13. 13. WSSM P L U M B I N G WORLD OUTREACH CHURCH MINISTRIES WASTEWATER MANAGEMENT PROPOSAL ©WSSM Ltd 11 4.5 LA U N D RY A proposed Laundry will be set up at the Hostel; the discharges from the Washing Machines will be managed by the Conder WWTP. In order not to compromise the bacteriological processes, eco-friendly Natural Laundry Detergents will be used, The compositions of these detergents are: i . they have no optical brighteners i i . no dyes or fragrances i i i. no phosphates This eco-friendly Natural Laundry Detergen ts is manufactured using low- foaming blend of naturally derived cleaning agents (coconut -derived surfactants, glycerin), natural water softeners, alkalinity builders, anti - redeposition agents (sodium citrate, borax), non -animal derived enzymes to remove protein and starch stains and protect fabrics, plant derived anti - foaming agents (glycerol monooleate, oleic acid), cleaning enhancer (calcium chloride), preservative (less than 0.05 percent), water, these ingredients will not compromise the operation of the WWTP or the surrounding environment. 5.0 KITCHEN SINK The wastewater generated from the proposed double compartment Kitchen Sink located in the Mini Mart/Food Court , will be disposed of via a Grease Trap, then into the receiving Storm Drain system. Figure 3 - Kitchen Sink to Grease Trap Process Flow diagram
  14. 14. WSSM P L U M B I N G WORLD OUTREACH CHURCH MINISTRIES WASTEWATER MANAGEMENT PROPOSAL ©WSSM Ltd 12 5.1 Grease Trap The Grease trap will intercept approximately 95% of F.O.G s (Fats, Oils and greases) from Kitchen Sink effluent. The intercepted FOGs solidify when cooled and take the form of a floating scum layer; this coagulation process is expedited with the introduction of cold condensate water. GREASE TRAP CALCULATIONS Dimension of Double Compartment Kitchen Sink Length 16 ins Width 12 ins Depth 18 ins Capacity of Double Compartment Kitchen Sink 3456 ins3 Amt of compartments in Kitchen Sink 2 only Capacity of Kitchen Sink 6912 ins3 1 Gallon Per Minute 231 ins3 Flow Rate from Kitchen Sink 29.9 GPM Adjust for displacement by contents 0.75 Kitchen Sink discharge rate 22.4 GPM Condensate Lines discharge rate 2 GPM Maximum Flow Rate to be received by proposed Grease Trap 25 GPM Proposed Grease Trap Capacity 50 lbs. Table 6 Figure 4 - 50lb capacity Grease Trap
  15. 15. WSSM P L U M B I N G WORLD OUTREACH CHURCH MINISTRIES WASTEWATER MANAGEMENT PROPOSAL ©WSSM Ltd a PLANT LOADING PROFILE Influent Loadings Application No. Flow [l/day] Total Flow [l/day] BOD [g/day] Total BOD [g/day] NH4-N [g/day] Total NH4-N [g/day] Day Staff 10 10 100 38 380 5 50 Hostel Guest 50 50 2500 50 2500 13 650 We have used the above information to determine the influent conditions as summarised below. Please note, that the influent conditions are our best estimate for this application and that it remains the responsibility of W.O.M to specify actual influent conditions in both quantity and characteristics. Total Daily Flow 2600 (l/day) Peak Flow 0.09 (l/sec) Total Influent Organic Load (BOD5) 2880 (gBOD5/day) Total Influent Ammoniacal Nitrogen 700 (gNH3/4/day) Concentration of Influent BOD5 362 (mg/l) Concentration of Influent Ammoniacal Nitrogen 41.5 (mg/l) Discharge Consent This Clereflo system is designed to meet and surpass The Water Pollution Rules (Second Schedule) BOD5 20 mg/l Suspended Solids 30 mg/l Ammoniacal Nitrogen NH34 10 mg/l Nitrification For effective ammoniacal nitrogen treatment it is assumed that the incoming water supply has a high level of total alkalinity (as calcium carbonate), which is at least a minimum of 7.1 times that of the ammoniacal nitrogen to be removed plus a margin. The waste water will have a minimum carbonate content of: 295 mg/l
  16. 16. WSSM P L U M B I N G WORLD OUTREACH CHURCH MINISTRIES WASTEWATER MANAGEMENT PROPOSAL ©WSSM Ltd ii Desludging Maximum interval between de-sludging of Primary Tank: 90 Days (at full plant loading) We have offered standard Conder Products equipment and have not included for any client specific specifications. If these become available we reserve the right to adjust our proposal accordingly
  17. 17. WSSM P L U M B I N G WORLD OUTREACH CHURCH MINISTRIES WASTEWATER MANAGEMENT PROPOSAL ©WSSM Ltd iii
  18. 18. WSSM P L U M B I N G WORLD OUTREACH CHURCH MINISTRIES WASTEWATER MANAGEMENT PROPOSAL ©WSSM Ltd a WATER POLLUTION RULES SECOND SCHEDULE (Rule 8) PERMISSIBLE LEVELS Water Pollutants Receiving Environment No. Parameters or Substances Inland Surface Water Coastal Nearshore Marine Offshore Environmentally Sensitive Areas and/or Groundwater Levels or Conditions 1 Temperature 35 40 45 NIAA 2 Dissolved Oxygen <4 <4 <4 <4 3 Hydrogenion (pH) 6 - 9 6 - 9 6 - 9 6 - 9 4 Five day Biological Oxygen Demand (BOD5 at 20°C) 30 50 100 10 5 Chemical Oxygen Demand (COD) 250 250 250 60 6 Total Suspended Solids (TSS) 50 150 200 15 7 Total Oil and Grease (TO&G) or n-Hexane ExtractableMaterial (HEM) 10 15 100 No release 8 Ammoniacal Nitrogen (NH3-N) 10 10 10 0.1 9 Total Phosphorus (P) 5 5 5 0.1 10 Sulphide (H2S) 1 1 1 0.2 11 Chloride (Cl - ) 250 NIAA NIAA NIAA 12 Total Residual Chlorine (Cl2) 1 1 2 0.2 13 Dissolved Hexavalent Chromium (Cr 6+ ) 0.1 0.1 0.1 0.01 14 Total Chromium (Cr) 0.5 0.5 0.5 0.1 15 Dissolved Iron (Fe) 3.5 3.5 3.5 1 16 Total Petroleum Hydrocarbons (TPH) 25 40 80 No release 17 Total Nickel (Ni) 0.5 0.5 0.5 0.5 18 Total Copper (Cu) 0.5 0.5 0.5 0.01 19 Total Zinc (Zn) 2 2 2 0.1 20 Total Arsenic (As) 0.1 0.1 0.1 0.01 21 Total Cadmium (Cd) 0.1 0.1 0.1 0.01 22 Total Mercury (Hg) 0.01 0.01 0.01 0.005 23 Total Lead (Pb) 0.1 0.1 0.1 0.05 24 Total Cyanide (CN - ) 0.1 0.1 0.1 0.01 25 Phenolic Compounds (phenol) 0.5 0.5 0.5 0.1 26 Radioactivity NIAA NIAA NIAA NIAA Levels or Conditions 27 Toxicity NATE NATE NATE NATE 28 Faecal Coliforms 400 400 400 100 29 Solid Waste NSD NSD NSD NSD a all units are in milligrams per litre (mg/L) except for temperature (°C), pH (pH units), faecal coliforms (counts per 100 ml), radioactivity (Bq/L) and toxicity (toxic units) NIAA - no increase above ambient NATE - no acute toxic effects NSD - No solid debris <– less than
  19. 19. WSSM P L U M B I N G WORLD OUTREACH CHURCH MINISTRIES WASTEWATER MANAGEMENT PROPOSAL ©WSSM Ltd ii SPECIFICATIONS FOR THE SALCOR MODEL 3G UV WASTEWATER DISINFECTION UNIT 1.0 DESCRIPTION The Salcor 3G disinfection chamber couples directly to the aerobic plant discharge pipe and is permanently installed below grade. The design details of the Salcor 3G unit are shown in section 4.0. The ultraviolet light source for disinfection is mounted in a sub-assembly which can be inserted or removed through the top of the riser pipe for periodic servicing. The light source is mounted in the center of an anodized aluminum frame which divides the disinfection chamber in half. The frame seals against the inner surface of the disinfection chamber to prevent flow bypass. When fully inserted, the disinfection sub-assembly is properly located by two pins mounted near the top of the disinfection chamber. The disinfection subassembly causes the wastewater entering one side of the unit to flow vertically downward, make a 180 degree turn, and then flow vertically upward and out the other side of the unit. This well-defined flow path is designed to give the fluid proper exposure time and no short circuiting. The ultraviolet light source is surrounded by a clear fused quartz tube to control the lamp surface temperature. A clear TeflonTM film covers the quartz tube to minimize surface fouling. This design feature incorporates the beneficial attributes of both quartz and TeflonTM. When the disinfection chamber is filled with water, the ultraviolet light source can operate continuously, whether or not water is flowing. Continuous operation with a lamp surface temperature range of between 105 and 120 degrees Fahrenheit provides optimum ultraviolet light output and long lamp life. The Salcor Model 3G alarm relay circuit triggers an external alarm to warn the user when the UV lamp is not operating properly. Electronic components in the circuit sense changes in the UV lamp operation which correlate with the germicidal ultraviolet output. The normally energized relay has contacts that allow actuation of an external alarm indicating low UV output or lamp outage. The alarm relay circuit has been designed to be compatible with a wide variety of alarms used on upstream aerobic treatment plants, and is compatible with either 120 VAC or DC power. The disinfection sub-assembly, which may extend approximately one foot above grade, is water tight throughout its length, which protects the electrical connections inside the junction box from any fluid backup. When the UV lamp is producing ultraviolet germicidal light at a safe level, a green LED indicator light, located on the outside of the electrical junction box, glows indicating proper UV lamp
  20. 20. WSSM P L U M B I N G WORLD OUTREACH CHURCH MINISTRIES WASTEWATER MANAGEMENT PROPOSAL ©WSSM Ltd iii operation. The light stops glowing when the light output from the UV lamp falls below a safe level. 2.0 DESIGN PARAMETERS 2.1 Flow Rate. Maximum flow at 3 gpm (4320 gpd) for waste water effluents for suspended solids less than 30 mg/liter and BODs less than 30 mg/liter. Maximum flow rate of 6 gpm (8640 gpd) for waste water effluents of suspended solids less than 10 mg/liter and BODs less than 10 mg/liter. 2.2 Fecal coliform reduction at lamp end-of –life (2 years) greater than 99.9 percent. 2.3 Inlet and outlet pipe is 4 inch schedule 40 ABS. 2.4 Pressure drop is less than 0.5 inches of water at maximum flow rate. 2.5 Power use is 30 Watts. 2.6 Energy use is 0.72 kW-hr/day. 2.7 UV lamp is low pressure mercury, 90 percent of output at 253.7 nanometers. Minimum arc length is 30 inches, and the UV intensity is greater than 190 microwatts/cm2 at one meter. The lamp life is greater than two years. 2.8 UV dose is greater than 55 mj/cm (55,000 microwatt-seconds/cm2). 2.9 UV Lamp Ballast. Ninety Percent efficient, high frequency (50 kilohertz) with thermal link protection. Input Voltage, 120 VAC, 50 or 60 Hz. Input current, up to 0.5 amps. 3.0 THIRD PARTY TESTING 3.1 University of Rhode Island. George Loomis 1999 - 2005  FAST Unit effluent  Annual Service  Lamp replacement every two years  Geometric mean fecal coliform count 9.4/100 ml 3.2 Washington State Testing  Advanced Treatment Unit & UV  NSF Standard 40 & WA State Fecal Coliform Reduction Protocol  Duration 26 weeks  Seventeen tests have been completed.  3G UV Effluent Fecal Coliform ranged from 2 – 35 per 100 ml (Geometric Mean)  Demonstrates that the 3 G UV unit operates reliably without maintenance over 6 months 3.3 Manufacturers Who Have Tested With the Salcor 3G Unit Using the Washington State Protocol  Consolidated Treatment, Enviroguard .75.  Consolidated Treatment, Multiflo.  Consolidated Treatment, Nyadic.  Delta Whitewater, DF 60.  Delta Whitewater, Ecopod.  Aero Tech.  Clearstream.  Aqua Klear.
  21. 21. WSSM P L U M B I N G WORLD OUTREACH CHURCH MINISTRIES WASTEWATER MANAGEMENT PROPOSAL ©WSSM Ltd iv
  22. 22. WSSM P L U M B I N G WORLD OUTREACH CHURCH MINISTRIES WASTEWATER MANAGEMENT PROPOSAL ©WSSM Ltd v
  23. 23. WSSM P L U M B I N G WORLD OUTREACH CHURCH MINISTRIES WASTEWATER MANAGEMENT PROPOSAL ©WSSM Ltd vi
  24. 24. WSSM P L U M B I N G WORLD OUTREACH CHURCH MINISTRIES WASTEWATER MANAGEMENT PROPOSAL ©WSSM Ltd vii
  25. 25. WSSM P L U M B I N G WORLD OUTREACH CHURCH MINISTRIES WASTEWATER MANAGEMENT PROPOSAL ©WSSM Ltd viii

×