Reverse osmosis system malfunction phenomenon mainly has three types: water reduction, salt transmittance increases and increases the pressure drop, reverse osmosis system fails to cause a decline in desalting rate and the reducing of the product quantity, if both or one of them was slowly decreased, may be common phenomenon of dirt or scale produces, can be cleaned by reverse osmosis system to solve the problem.
1. Assess the mechanical and chemical problems of reverse osmosis systems.
The mechanical problems of reverse osmosis system mainly include the damage of o-ring, the damage of brine seal, the damage of the pump, the damage of pipes and valves, the imprecise instrument and so on.
Chemical problems a reverse osmosis system is not appropriate acid added, high dose of acid can damage the membrane or cause based on sulphate scale, low dose can cause the carbonate scaling based on metal hydroxide or pollution;
Two is the improper addition of scale inhibitor, high dose may lead to pollution, low dosage may lead to scale.
2. Identification of anti-osmosis system pollutants.
One is the analysis of feed liquid, salt water and liquid product of inorganic components, total organic carbon (TOC), turbidity, pH, TDS, total suspended solids (TSS), SDI and temperature, including the determination of SDI, TSS and turbidity can provide the basis of particulate matter pollution, the determination of TOC can be indicated that organic matter pollution tendency;
The second is the immersion and analysis of the reverse osmosis system feed liquid cartridge filter or SDI filter pad.
3. Reverse osmosis system to verify instrument operation.
Including pressure gauge, flow meter, pH meter, conductivity meter, thermometer, etc.
4. The change of chemical conditions of feed water in reverse osmosis system was analyzed.
Compared with the baseline data of the current feed water analysis and design, the changes in the chemical conditions of feed water will produce the need to preprocess or update the original pretreatment equipment.
5. Re-check operation data of reverse osmosis system.
The changes of operation record, flux and desalting rate were examined, and the effects of temperature, pressure, water supply concentration and age of film on yield and desalination rate were considered.
6. Select the appropriate cleaning solution for reverse osmosis system.
In the selection of cleaning solution, the following factors should be considered: the type of membrane and the compatibility of cleaning agents, the requirements of cleaning equipment, the structural materials of the system, the identification of pollutants, etc.