RO (reverse osmosis) membrane scale inhibitor for industrial wastewater treatment and use method of RO membrane scale inhibitor

Abstract

The invention relates to an RO (reverse osmosis) membrane scale inhibitor for industrial wastewater treatment. The RO membrane scale inhibitor comprises the following raw material components in percentage by weight: 8-16% of organic phosphates, 5-10% of hydrolytic polymaleic anhydride, 5-8% of zinc salt, 20-48% of sodium lignin sulfonate, 20-40% of activated humic acid, 3-8% of propylene glycol alginate and 4-10% of a surfactant. The preparation method of the activated humic acid comprises the following steps: adding an activating agent with the concentration of 30-40% into humic acid, adjusting the pH value to 8.5-9.5, adjusting the solid-to-liquid ratio to (0.3-0.5): 1, stirring, activating for 10-60 minutes at the temperature of 60-85 DEG C, centrifugally separating, filtering and drying, washing with water until the solution is neutral, centrifugally separating and drying to obtain the activated humic acid. According to the scale inhibitor, sodium lignin sulfonate and activated humic acid are used as main materials, propylene glycol alginate, a surfactant, organic phosphates, hydrolytic polymaleic anhydride and zinc salt are matched for combined action, the efficient scale inhibition effect is achieved, and the use adding amount is 4.0-6.5 mg / L during water treatment and is far lower than the adding amount of a scale inhibitor in the prior art.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to an RO reverse osmosis membrane scale inhibitor for industrial wastewater treatment and a use method thereof. Background technique [0002] Reverse osmosis antiscalant is a scale inhibitor specially used in reverse osmosis (RO) systems, nanofiltration (NF) and ultrafiltration (UF) systems. running costs. [0003] With the increasing shortage of water resources and the continuous development of membrane technology, reverse osmosis desalination is one of the most mature physical desalination technologies in water treatment desalination process, and is widely used in water treatment in many industries. Scaling is one of the main problems affecting the normal operation of reverse osmosis technology during the development process. When there is scale deposition on the membrane surface, it is necessary to stop the equipment for chemical cleaning, or even replace the membrane el...

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Problems solved by technology

[0005] Therefore, the use of humic acid as a scale inhibitor raw material has great potential, but the active groups of humic acid are easily passivated during storage, which affects its scale inhibition effect. On the other hand, because of the complex of humic acid and metal ions The combination performance is strong, resulting in poor anti-flocculation effect, and it is easy to precipitate in the storage tank in the dosing system of water treatment antiscalant, which affects the dosing of antiscalant

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