Method for rapidly evaluating performance of reverse osmosis antisludging agent by determining pH value of solution

Abstract

The invention relates to a method for rapidly evaluating the performance of a reverse osmosis antisludging agent by determining the pH value of a solution, comprising the following steps of: (1) adding a CaCl2 solution the concentration of which is C1 and the volume of which is V1 and an antisludging agent the dosage of which is W to a container; (2) making the container airtight at constant temperature under stirring, then dropwise adding a NaHCO3 solution the concentration of which is C2 and the volume of which is V2 and marking as the first time; (3) recording the pH value of the solution after t min, simultaneously dropwise adding the NaHCO3 solution the concentration of which is C2 and the volume of which is V2 and marking as the second time; (4) repeating the step (3) until the pH value of the solution falls, wherein the adding time of the NaHCO3 solution sums to n, and recording the pH value of the solution when the NaHCO3 solution is added for the (n-1) time and the volume (n-1)V2 of the accumulatively consumed NaHCO3 solution; and (5) working out the supersaturation S of CaCO3 in the solution when the NaHCO3 solution is added for the (n-1) time, and judging the performance of the antisludging agent according to the S magnitude. The method is rapid and accurate, has simple test condition and is easy to operate.

Description

technical field [0001] The invention belongs to the technical field of water treatment in environmental engineering, and in particular relates to a static method for quickly evaluating the performance of a reverse osmosis scale inhibitor by measuring the pH value of a solution. Background technique [0002] Scaling is one of the main problems affecting the normal operation of reverse osmosis, and adding antiscalants has become one of the effective means to control the fouling of reverse osmosis membranes. At present, the evaluation methods of reverse osmosis antiscalants by domestic and foreign researchers are divided into two categories: static evaluation method and dynamic evaluation method. [0003] Static scale inhibition methods mainly include calcium carbonate deposition method, bubbling method, turbidity method, conductivity method, etc. Among them, the calcium carbonate deposition method and bubbling method are commonly used evaluation methods for scale inhibitors u...

AI Technical Summary

Problems solved by technology

The dynamic evaluation method can well simulate the operating conditions of reverse osmosis and accurately evaluate the performance of antiscalants, but the dynamic evaluation method is laborious and time-consuming

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