What factors need to be considered in the selection of reverse osmosis chemicals

When selecting a reverse osmosis (RO) agent, a number of factors need to be considered to ensure that the agent is both effective in protecting the RO membrane and meets specific water quality conditions and system requirements. The following are some of the key factors to consider when selecting RO chemicals:

1. Incoming water quality

• Total Dissolved Solids (TDS): The higher the TDS in the feed water, the easier it is to form scales, so stronger scale inhibitors are needed.
  

• Hardness: Calcium, magnesium and other hardness components are the main cause of scaling, and high hardness water sources require highly effective chelating agents or scale inhibitors.
  

• Silicon content: High silicon content may lead to the formation of silica scale, which requires a silica-specific scale inhibitor.
  

• Iron, manganese and other metal ions: these ions may lead to membrane contamination, and need the corresponding chelating agent or flocculant.
  

• Microbiological contamination: If the feed water contains more microorganisms, it may be necessary to add biocides or disinfectants.
  

2. System Operating Conditions

• pH: The effectiveness of chemicals may vary under different pH conditions. Some agents work best in a specific pH range.
  

• Temperature: Temperature affects the solubility and reaction rate of chemicals. High temperatures may accelerate the decomposition of some agents.
  

• Recovery: Higher recovery means higher concentration, increasing the risk of fouling and the need for more potent scale inhibitors.
  

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