Operation and Maintenance Manual for

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LC Manual 11/02 Rev. 3 SYSTEM MAINTENANCE C. Testing for Residual Sanitant After flushing the sanitant from the RO system, the product water should be checked for residual levels of sanitizing agent before the system is placed back on line. Use the following guidelines to determine if the system is clear of residual sanitizing agents. 1. Peracetic Acid The product water should be analyzed with the Peracetic Acid Residual Test Strip or other peracetic acid test kit. For ordering information call the number provided on the cover of this manual. 2. Hydrogen Peroxide The product water should be analyzed with a hydrogen peroxide test kit. 3. Formaldehyde The product water should be analyzed with a formaldehyde test kit until detection limits are reached. D. Methods of Sanitization Sanitization is most effective when the RO system is operating at normal pressure and flows. This allows the maximum amount of sanitant to penetrate through the membrane, ensuring adequate sanitization of the product side of the system. In addition, sanitant should contact all wetted components of the RO system including prefilter housing, valves, flowmeters, and sample ports to ensure maximum effectiveness. Three methods of sanitization may be used: Recirculation, Continuous Injection and Static Soak. 1. Recirculation Method This method requires an accessory tank and booster pump. A sanitant solution is prepared in the tank and fed to the RO system via the booster pump. The product and reject streams are diverted to the tank and the sanitant is recirculated through the system for a period of time. The advantages of the recirculation method of sanitization are minimal usage of chemical, and ease in obtaining the proper sanitant concentration. In addition, the accessory tank and booster pump may also be used for system cleaning. The following steps provide a general guideline for the recirculation method of sanitization. a. A batch of sanitant, typically 10 to 20 gallons (40 to 80 liters) for the LC series RO systems is prepared in the tank by diluting the sanitization chemical with water. b. The product and reject lines are diverted to the tank. Do not use the cleaning ports on the RO system to make these connections. USFilter 4-3
SYSTEM MAINTENANCE LC Manual 11/02 Rev. 3 It is important that the sanitization chemical contact all the piping within the RO system c. The outlet of the booster pump is connected to the feed of the RO system. This connection should be made prior to the prefilter housing. d. The booster pump is turned on and the RO is run in the normal operating mode for 30 to 60 minutes. CAUTION Monitor the solution temperature during recirculation. Do not allow the temperature to exceed 25° C (77° F). e. The booster pump and the RO system are shut down and the sanitant is allowed to sit in the system (optional). f. The RO is switched back to the normal feed source and run in the normal operating mode with the product diverted to drain until all residual sanitization chemicals are flushed from the system. g. The tank and booster pump are drained and flushed with clean water. h. A new prefilter is installed in the system prefilter housing. 2. Continuous Injection Method In this method of sanitization, an accessory chemical feed system injects concentrated sanitant into the feed line while the RO is operating at normal flow and pressure. Both the product and reject streams are sent directly to drain. The continuous injection method is most typically used to sanitize with hydrogen peroxide. It may be used with peracetic acid if an appropriately sized chemical feed system is available for the typical 1:100 dilution ratio. It is not practical for formaldehyde sanitization because the dilution ratio used for formaldehyde (1:10 to 1:20) would require the use of a large chemical feed pump. The advantages of the continuous injection method are minimal chemical handling and minimal dead legs in the system piping. One disadvantage is the relatively high chemical consumption. The basic steps for continuous injection sanitization are as follows: a. An accessory chemical feed system is connected to the feed piping of the system, typically at the system inlet sample valve. b. Reject and product lines from the RO are diverted to drain. Do not use the cleaning ports on the RO system to make these connections. It is important that the sanitization chemical contact all the piping within the RO system. c. The system is operated at normal flow and pressure. 4-4 USFilter
Page 1 and 2: USFilter 10 Technology Drive Lowell
Page 3 and 4: This manual discloses information i
Page 5 and 6: TABLE OF CONTENTS SECTION DESCRIPTI
Page 7 and 8: LC Manual 11/02 Rev. 3 INTRODUCTION
Page 9 and 10: LC Manual 11/02 Rev. 3 INTRODUCTION
Page 11 and 12: LC Manual 11/02 Rev. 3 SYSTEM INSTA
Page 13 and 14: LC Manual 11/02 Rev. 3 SYSTEM INSTA
Page 15 and 16: LC Manual 11/02 Rev. 3 OPERATING IN
Page 21: SYSTEM MAINTENANCE LC Manual 11/02
Page 25 and 26: SYSTEM MAINTENANCE LC Manual 11/02
Page 31 and 32: TROUBLESHOOTING LC Manual 11/02 Rev
Page 33 and 34: LC Manual 11/02 Rev. 3 WARRANTY 6.1
Page 35 and 36: APPENDIX LC Manual 11/02 Rev. 3 7.1
Page 41 and 42: APPENDIX LC Manual 11/02 Rev. 3 RO
Page 45 and 46: Product Description/Equipment Speci
Page 47 and 48: Process Water Systems General Speci
Page 49 and 50: Process Water Systems Low feed pres
Page 51 and 52: Process Water Systems Skid Cleaning
Page 53 and 54: Series 1, 2 & 3 Pumps Page 1 of 2 [
Page 55 and 56: Product Information FILMTEC Membran
Page 57 and 58: USFilter USFilter USFilter USFilter
Page 59 and 60: Conventions and Symbols ii Special
Page 61 and 62: Table of Contents iv MC10 Overview
Page 63 and 64: Specifications The MC10 incorporate
Page 65 and 66: ! The MC10 may be configured to use
Page 67 and 68: Installation 2 Environmental The MC
Page 69 and 70: I/O The wiring diagram for the inpu
Page 71 and 72: Operation 3 Controls The MC10 is ho
Page 73 and 74:
Sequence The normal startup and shu
Page 75 and 76:
7 Perm Divert TD Sec 8 High Temp SP
Page 77 and 78:
Time Delays Time delays and deadban
Page 79 and 80:
Important Please note: • Temperat
Page 81 and 82:
Troubleshooting 5 The MC10 Reverse
Page 83 and 84:
Type of Problem Possible Cause or S
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