Operation and Maintenance Manual for

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LC Manual 11/02 Rev. 3 SYSTEM MAINTENANCE 4.1 GENERAL 4.0 SYSTEM MAINTENANCE Routine customer maintenance procedures consist of daily checks of the system to record operating data, periodic replacement of the prefilter cartridge and sanitization and cleaning of the RO membranes. The prefilter cartridge should be changed monthly or when the differential pressure reaches 10-15 psig, whichever comes first. Sanitization is recommended every four to eight weeks or longer, depending on the application. The RO membranes should be cleaned when the normalized product flow rate drops by more than 15% or the salt rejection drops by more than 3%. In addition, the system's external surface should be kept clean by occasionally wiping down all surfaces with a dust-free cloth and visually checking for cracked glass on gauges, loose fittings, and broken or missing hardware. Whenever the prefilter cartridge or RO membranes are replaced, inspect the serviceability of the o-ring seals prior to assembly. Inspect o-rings for signs of deterioration or cracking, and replace as required. It helps to lubricate o-rings with glycerin before re-assembly. 4.2 SANITIZING THE REVERSE OSMOSIS SYSTEM CAUTION Chlorine is not compatible with thin film composite RO membranes, and must not be used to sanitize them. Periodically, the RO System may require sanitization in order to maintain the performance of the RO membranes, and to ensure a low bacterial count in the product water. How frequently the system is sanitized depends on the quality of the water needed for your particular application. Monitor bacterial levels in the feed and permeate as needed. When bacterial levels increase above an acceptable level for the application, sanitize the system. The choice of the sanitizing agent depends on its compatibility with the polyamide thin film composite RO membranes and system components, and the agent’s effectiveness as a sanitant. The most commonly used sanitants are hydrogen peroxide and peracetic acid. Formaldehyde can also be used as a sanitant however it is rarely used due to stringent OSHA exposure limits. A. Different Sanitizing Agents 1. Peracetic Acid (Preferred Method) Advantages of using peracetic acid are that it has no toxic vapors, is biodegradable, easily disposable, and has good biocidal activity. Because of these qualities, operators can be assured that they are not handling toxic materials. Peracetic acid decomposes into oxygen, water, and acetic acid, which do not harm the environment. Several peracetic acid solutions are commercially available, including; Minncare and Renalin Dialyzer Reprocessing Concentrate, both products of Minntech Corporation, and P3-Oxonia Active, a product of Henkel Corporation. For ordering information call the number provided on the cover of this manual. USFilter 4-1
SYSTEM MAINTENANCE LC Manual 11/02 Rev. 3 2. Hydrogen Peroxide Advantages of using hydrogen peroxide are that it has no toxic vapors, is biodegradable, is easily disposable, has good biocidal activity, and breaks down into oxygen and water, which does not harm the environment. Because of these qualities, operators can be assured that they are not handling toxic materials. 3. Formaldehyde Formaldehyde is one of the most effective agents used for sanitization. It is compatible with most materials, is highly active as a biocide over a relatively wide pH range, and easily penetrates the RO membrane, thus ensuring that the downstream side of the filter is sanitized. But, formaldehyde is difficult to flush from the system after sanitization, has an objectionable odor, and causes irritation to the eyes and nasal passages. In addition, formaldehyde is a suspected carcinogen. Formaldehyde, in solution, is purchased as formalin, which is a 37% solution of the formaldehyde gas stabilized with methanol. CAUTION When using formaldehyde to sanitize thin film composite RO membranes, the membranes must have been in use for 24 hours prior to sanitization, or a severe loss in flow rate may occur. B. Selecting a Sanitant Table 4-1 lists the type and concentration of sanitizing agent that should be used for polyamide thin film composite membranes, as well as the minimum contact time for sanitization. Table 4-1: Sanitization Times and Concentrations for Polyamide Thin Film Composite Membranes. Sanitant Sanitant Concentration Sanitant Contact Time Peracetic Acid * up to 400 ppm (0.04%) 60-120 minutes Hydrogen Peroxide * up to 2,000 ppm (0.2%) 60-120 minutes Formaldehyde ** 2-3% 30 minutes minimum * When using hydrogen peroxide or peracetic acid with thin film composite membranes, the temperature should not exceed 25° C (77° F). Also, the presence of iron or heavy metals can cause membrane degradation. Clean the membranes first if iron is present in the feed water. ** When using formaldehyde to sanitize thin film composite membranes, the membranes must have been in use for 24 hours prior to sanitization. 4-2 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 17 and 18: LC Manual 11/02 Rev. 3 OPERATING IN
Page 19: LC Manual 11/02 Rev. 3 OPERATING IN
Page 23 and 24: 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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