Details

Autor(en) / Beteiligte

• Liu, Wenshi
• Sun, Lingru
• Tao, Sha

Titel

Removal of Ca 2+ , Mg 2+ , Ba 2+ and Sr 2+ from shale gas flowback water from the Sichuan Basin in China by chemical softening under the guidance of OLI Stream Analyzer: precipitation behaviors and optimization study

Ist Teil von

• Water science and technology, 2020-07, Vol.82 (1), p.194

Ort / Verlag

England

Erscheinungsjahr

2020

Quelle

MEDLINE

Beschreibungen/Notizen

• The disposal of flowback water is recognized as a key issue for the sustainable shale gas development and discharge after reasonable treatment is considered as a feasible pathway. One of the challenges during treatment is the severe mineral scaling potential in reverse osmosis desalination, especially with high amounts of Ca , Mg , Ba and Sr in flowback water. In this study, precipitation behaviors of Ca , Mg , Ba and Sr during traditional chemical softening was evaluated so as to achieve optimal chemical dosage. Both jar tests and OLI Stream Analyzer simulation revealed that the main precipitates were CaCO , SrCO and BaSO during Na CO addition, and Ba could not be removed efficiently by Na CO unless a high dosage was applied since Ba would react after the precipitation of Ca and Sr . Reverse Osmosis System Analysis simulation indicated that Ba was a concern because Ba would form tenacious BaSO scale on the reverse osmosis membranes. Finally, the Na SO -NaOH-Na CO process was proposed for chemical softening as it has a high removal efficiency and low chemical cost. Overall, this study presents an effective chemical softening method and OLI Stream Analyzer could serve as a reliable tool for the calculation, which would finally improve the design and operation of shale gas flowback water treatment.