Nutrient recovery from concentrated municipal wastewater by forward osmosis membrane and MgCl2 based draw solution


Damirchi M., Koyuncu İ.

DESALINATION AND WATER TREATMENT, cilt.211, ss.448-455, 2021 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 211
  • Basım Tarihi: 2021
  • Doi Numarası: 10.5004/dwt.2021.26788
  • Dergi Adı: DESALINATION AND WATER TREATMENT
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aqualine, Aquatic Science & Fisheries Abstracts (ASFA), Biotechnology Research Abstracts, CAB Abstracts, Environment Index, Geobase, Pollution Abstracts, Veterinary Science Database, Civil Engineering Abstracts
  • Sayfa Sayıları: ss.448-455
  • İstanbul Teknik Üniversitesi Adresli: Evet

Özet

In this study, a forward osmosis membrane was used to concentrate municipal wastewater up to 90%. The concentrated wastewater provided a high content organic matter for subsequent anaerobic treatment. At the same time, phosphorus content was recovered via precipitation. Energy-dispersive X-ray spectroscopy was done to evaluate the recovered solid. Results showed that precipitated phosphorus constituted only 2.46% cellulose triacetate (CTA membrane) and 2.24% thin-film composite (TFC membrane) of the total recovered solid. Although these percentages account for 72% of total phosphorus in the CTA test and 56% of total phosphorus in the TFC test, recovery of unwanted precipitate (Calcite) is still the main drawback. This can be attributed to the high calcium to phosphorus molar ratio in municipal wastewater and the presence of bicarbonate, which ultimately facilitates the formation of calcite as the dominant recovered solid. Regardless of membrane type, complete water flux recovery was achieved after chemical cleaning. It indicates that chemical cleaning can effectively recover the water flux to its virgin membrane flux for direct municipal wastewater concentration.