Seawater reverse osmosis technology is widely used in many applications due to its special advantages. Many users who are not technical might suffer a lot of problems about how to clean RO device, so it is necessary to manage sea water reverse osmosis system well for avoiding serious problems. There are mainly three kinds of cleaning ways for SWRO system  as follows:

1. Pembilasan bertekanan rendah Sistem osmosis balik air laut

It is beneficial to remove the fouling at the surface of RO membrane in seawater desalination and maintain membrane performance by high flow flushing, low-pressure flushing, and low PH flushing of RO device regularly. Or when the SDI of water in RO device is suddenly above 5.5, it should adopt low-pressure flushing, and start up again after adjusting SDI.

2. Pembersihan proteksi pematian sistem SWRO

Due to production fluctuation, seawater reverse osmosis system unavoidably often shut down. It is necessary to take protective action when stopping at a short time or long time. Inappropriate treatment will lead to the membrane performance declining and not easy to recover.

Pengawetan waktu yang singkat cocok untuk sistem yang mati kurang dari 15 hari, dan dapat mengadopsi pembilasan bertekanan rendah setiap 1 hari hingga 3 hari untuk melindungi perangkat RO. Ditemukan bahwa, ketika suhu air di atas 20, air dalam perangkat RO desalinasi air laut akan menjadi bau dalam waktu 3 hari, dan membiakkan banyak bakteri. Oleh karena itu, disarankan untuk mengadopsi pembilasan bertekanan rendah setiap 2 hari sekali atau 1 hari ketika suhu air di atas 20. Dan itu mengadopsi pembilasan bertekanan rendah setiap 3 hari sekali ketika suhu air di bawah 20. Setiap kali harus mematikan semua katup masuk dan keluar perangkat RO setelah pembilasan.

Longtime shutdown protection is suitable for the system of above 15 days, at this moment it has to use protection fluid (bacteriostat) to protect RO device. Common bacteriostat is 1% sodium bisulfite solution(quality score)

3. Pembersihan bahan kimia membran SWRO

SWRO membrane might be also polluted by inorganic fouling, colloid, microbes, and metal oxide in the normal running conditions. When these substances accumulate at the surface of the membrane, it will cause the output of seawater reverse osmosis plant or desalination rate declining, rise the pressure difference and even damage membrane greatly. Thereby, to better recover production and desalination rate performance, chemical cleaning for RO membrane is also required.

Whatever one of the following conditions, membrane element is requested to be cleaned:

  • Standardized production flow declines above 10%.
  • The standardized pressure difference between inlet and concentrated increases by 15%.
  • Standardized desalination rate increases by 5%.
  • It is verified that there is pollution or scaling; Even though pressure difference does not increase by 15%, it has run for 3~4 months; When it requires to stop operating long time, it should be cleaned before stopping.

Suhu pembersihan diminta di bawah 15 karena suhu yang lebih rendah dapat menyebabkan efek pembersihan. Pompa pembersih yang dipilih dapat mengatasi penurunan filter keamanan, penurunan elemen membran dan kehilangan pipa, dll. Umumnya tekanan yang dipilih adalah 0,3 ~ 0,5MPa.

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