| abstract |
The invention discloses an automatic dosing control system and method for a waste water softening pretreatment system, comprising a feedforward water volume compensation module, a first dosing pump flow control module, a second dosing pump flow control module, and hydroxide alkalinity feedback Control module, pH control module, carbonate alkalinity feedback control module, inlet water flow meter set at the entrance of the magnesium removal reaction unit, pH monitor set on the pipeline between the magnesium removal reaction unit and the calcium removal reaction unit, setting The online alkalinity monitor at the outlet of the clarification unit, the first frequency converter for controlling the lye dosing pump, and the second frequency converter for controlling the sodium carbonate dosing pump, the system and method can be used according to the effluent carbonate alkali. The real-time changes of alkalinity and hydroxide alkalinity and the fluctuation of influent water flow, timely feedback and adjust the dosage of sodium hydroxide/lime lye and sodium carbonate to stably control the hardness of calcium ions and magnesium ions in softened effluent. |