Study of various organophosphonate additives as calcium carbonate inhibitors for reverse osmosis

Alexey Andrianov,Zhanna Govorova,B Kaźmierczak,U Miller,P Jadwiszczak,M Kutyłowska

doi:10.1051/e3sconf/201910000001

Alexey Andrianov, Zhanna Govorova + Show 4 more

Open Access

https://doi.org/10.1051/e3sconf/201910000001

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Abstract

Various chemical additives are used in water treatment industry, among them – precipitation inhibitors for reverse osmosis membrane facilities. The development and synthesis of new inhibitor formulas and the study of their effectiveness is still an urgent task for many researchers working in this field. The relationship between the structure of phosphonate scale inhibitors and their effectiveness in preventing of calcium carbonate precipitation was studied. Two classes of tetraphosphonate and diphosphonate inhibitors that possess systematic structural similarities and differences have been tested on the laboratory membrane unit. All chemicals were tested at doses of 1 and 5 mg/L. The results showed that the antiscalant efficiency for both groups of inhibitors increases with elongation of methylene chain, but the longest compounds have a sharp drop in inhibition efficiency.

Highlights

Nowadays antiscalant dosing is assigned a leading role in the prevention of low-soluble salts sedimentation on reverse osmosis membranes [1, 2]
In addition to inhibiting efficiency, it is likely that low cost, usability and availability are required for widespread industrial use. Sometimes this is a reason to the limited use of new inhibitors
Sodium hexametaphosphate (HMPT) as well as antiscalants based on phosphonic acid are used widely at RO water treatment facilities

Summary

Introduction

Nowadays antiscalant dosing is assigned a leading role in the prevention of low-soluble salts sedimentation on reverse osmosis membranes [1, 2]. Every year new inhibitors are synthesized and tested in laboratory or industrial conditions. In addition to inhibiting efficiency, it is likely that low cost, usability and availability are required for widespread industrial use. Sometimes this is a reason to the limited use of new inhibitors. Among them the organophosphonates are dominating the global market [6,7,8,9]. They are readily soluble in water, non-toxic and effective at low treatment concentrations [10]

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