According to the analysis, the deposition of calcium sulfate generally exists in three stages. First, regardless of the concentration of influent, the sedimentation rate gradually increases from zero rate; second, with the increase of influent concentration, there is an acceleration of sedimentation rate in the middle of pollution. Process; Third, after an accelerated process, the deposition rate of pollutants tends to be stable.
The calcium sulphate cleaning of reverse osmosis system can be used: hydraulic cleaning, chemical cleaning or a combination of both.
The physical properties of the hydroflushing process remove the concentrated polarization layer on the membrane surface and have a certain removal effect on the fouling surface. The rapid pollution caused by the high concentration of calcium sulphate influent water has a faster recovery rate after the hydraulic flushing, and the recovery effect is also better; while the low concentration of calcium sulphate slow pollution of the washing effect is poor. In other words, the hydraulic flushing is more effective in fouling fouling formed in a short time, so the flushing of the system in the initial period of fouling can avoid the increase of pollution.
Chemical cleaning can further restore the performance of the membrane element. The chemical cleaning of the rapid concentration of high-concentration calcium sulfate is easier and more complete, and it is much more difficult to recover the slow-contamination performance of low-level calcium sulfate. Chemical cleaning dissolves the calcium sulfate scale by the agent to remove it; the shape of the fast growing crystal is not regular, and the chemical stability of the crystal is poor; the shape of the slow growing crystal is relatively regular, and the crystal chemical stability is good. Therefore, calcium sulphate must be chemically cleaned in a timely manner for the pollution of the reverse osmosis system, and the system performance can be better recovered, otherwise the irreversible pollution of the membrane system will be formed.
The calcium sulphate cleaning of reverse osmosis system can be used: hydraulic cleaning, chemical cleaning or a combination of both.
The physical properties of the hydroflushing process remove the concentrated polarization layer on the membrane surface and have a certain removal effect on the fouling surface. The rapid pollution caused by the high concentration of calcium sulphate influent water has a faster recovery rate after the hydraulic flushing, and the recovery effect is also better; while the low concentration of calcium sulphate slow pollution of the washing effect is poor. In other words, the hydraulic flushing is more effective in fouling fouling formed in a short time, so the flushing of the system in the initial period of fouling can avoid the increase of pollution.
Chemical cleaning can further restore the performance of the membrane element. The chemical cleaning of the rapid concentration of high-concentration calcium sulfate is easier and more complete, and it is much more difficult to recover the slow-contamination performance of low-level calcium sulfate. Chemical cleaning dissolves the calcium sulfate scale by the agent to remove it; the shape of the fast growing crystal is not regular, and the chemical stability of the crystal is poor; the shape of the slow growing crystal is relatively regular, and the crystal chemical stability is good. Therefore, calcium sulphate must be chemically cleaned in a timely manner for the pollution of the reverse osmosis system, and the system performance can be better recovered, otherwise the irreversible pollution of the membrane system will be formed.
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