Low phosphorus scale inhibitor for reverse osmosis membranes for reuse of reclaimed water

Abstract

The invention relates to the technical field of water treatment, in particular to a low phosphorus scale inhibitor for reverse osmosis membranes for reuse of reclaimed water. The low phosphorus scaleinhibitor is a composition prepared by compounding an acrylic acid-sulfonated styrene copolymer, a methacrylic acid-acrylate copolymer, an acrylic acid-2-acrylamide-2-methacrylic acid-N-tert-butyl acrylamide copolymer and N-xanthogenated chitosan. The low-phosphorus scale inhibitor provided by the invention has good scale inhibition and dispersion effects on the water quality of the reclaimed water, is very excellent in scale inhibition and dispersion effects, can guarantee the normal and efficient operation of a reverse osmosis system, has high adaptability to the complex water quality of thereclaimed water, and can prevent sewage blocking and scaling of the reverse osmosis system in a process of treating the reclaimed water; furthermore, the low-phosphorus scale inhibitor provided by the invention adopts a low-phosphorus formula, and the compounding materials are cheap and easy to obtain, and the preparation is simple. The low phosphorus scale inhibitor can enable the total phosphorus content of the concentrated water to be lower than the requirement of the national standard for the total phosphorus in disposal sewerage, thereby reducing the subsequent treatment cost of an enterprise.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a low-phosphorus scale inhibitor for reverse osmosis membranes used in reclaimed water. Background technique [0002] Reverse osmosis is a membrane water treatment method developed rapidly in the late 20th century. It is one of the most effective methods for brackish water treatment, seawater desalination, reclaimed water reuse, pure water, and high-purity water. Its central technology is the reverse osmosis membrane, which is a semi-permeable membrane made of special materials and processing methods. It can selectively permeate some components in the aqueous solution under the action of external pressure, so as to achieve the purpose of water desalination and purification. [0003] Reclaimed water is named after Japan. The definition of "reclaimed water" has many interpretations. It is called "reclaimed water" in sewage engineering and "reclaimed water" in factories. Ge...

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Problems solved by technology

[0006] At present, the reverse osmosis antiscalants in my country are mainly based on phosphine-based monomers. This type of antiscalant can play a good role in antiscaling when the reverse osmosis feedwater is groundwater, tap water and river water. The scale inhibition effect is not good when reclaimed water is used as the feed water; because the water quality of reclaimed water is relatively complex, with high content of COD, turbidity, organic matter, iron oxides, etc., it is particularly easy to cause fouling of the membrane, which greatly shortens the cleaning cycle. Affect the normal operation of the reverse osmosis system and affect production and life