Device and method for predicting sewage blockage of reverse osmosis membrane

Abstract

The invention discloses a device and a method for predicting sewage blockage of a reverse osmosis membrane. The method comprises the following steps: the corrected water production flux J of a reverse osmosis membrane is controlled to be unchanged, the operation pressure delta P0 of a water sample at an initial moment and the operation pressure delta P at a moment t are measured, the standardized pressure delta P / delta P0 at the moment t is calculated, and the time change rate of the standardized pressure at different moments is calculated; and the standardized pressure delta P / delta P0 at the moment t is fitted through a membrane sewage blockage model, and the specific process is that if the time change rate of the standardized pressure delta P / delta P0 is increased along with the increase of the filtering time t, a first model (shown in the specification) is adopted, wherein t is the filtering time; delta P is the operation pressure at the moment t, delta P0 is the operation pressure at the initial moment, delta P / delta P0 is the standardized pressure; j is dimensionless flux; delta pi N is osmotic pressure standardized by the initial operation pressure; alpha is a compensation coefficient; k is a resistance increasing coefficient; and b is a model parameter related to the filtering initial resistance. The method can accurately simulate and predict the change of the standardized pressure along with the operation time, and is high in goodness of fit.

Description

technical field [0001] The invention relates to the field of reverse osmosis systems, in particular to a device and method for predicting reverse osmosis membrane fouling. Background technique [0002] The reverse osmosis (RO) process is more and more used in the production of high-standard industrial pure water due to its good water quality, small footprint and stable operation. In theory, the reverse osmosis membrane can intercept most of the pollutants in the water, so as to ensure good water quality. However, some of the intercepted pollutants will adhere to the surface of the reverse osmosis membrane, resulting in a decrease in membrane flux and a decline in the quality of the produced water. It is the core problem that limits the stable operation of the reverse osmosis process. In the actual project operation process, in order to ensure the stability of water production, the operation mode of constant flux and variable pressure is usually adopted. After membrane foul...

AI Technical Summary

Problems solved by technology

In theory, the reverse osmosis membrane can intercept most of the pollutants in the water, so as to ensure good water quality. However, some of the intercepted pollutants will adhere to the surface of the reverse osmosis membrane, resulting in a decrease in membrane flux and a decline in the quality of the produced water. It is the core problem that limits the stable operation of the reverse osmosis process

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