[논문]Usable water production from coal seam gas water with a combination of pore control fiber filtration and reverse osmosis

Shin, Choon Hwan; Bae, Jun Seok

doi:10.4491/eer.2017.159

Usable water production from coal seam gas water with a combination of pore control fiber filtration and reverse osmosis 원문보기

Environmental engineering research, v.23 no.2, 2018년, pp.210 - 215

Shin, Choon Hwan (Department of Energy & Environmental Engineering, Dongseo University) , Bae, Jun Seok (CSIRO Energy, 1 Technology Court)

Abstract ▼ AI-Helper

Coal seam gas (CSG) water, to be discharged, has been usually treated in reverse osmosis (RO) plants which require extensive and expensive pre-treatment. However, current low gas prices have been a great driver for relevant industries to seek for alternative cost-effective technologies in the aspect of its beneficial use and fit-for-purpose usable water production. In this paper, a combined system with a two-stage pore control fiber (PCF) filtration and a RO system was designed and tested for CSG water treatment. Also, a coagulation reactor was placed in front of the PCF to further enhance suspended solid removal. More than 99% of SS were removed through the PCF filtration while organic, total nitrogen and total phosphorous were mostly removed by the RO system. Especially along with a decrease in conductivity, the total dissolved solid derived from salts was mainly removed in the RO system. Having $OH^-$ undetected, $HCO_3{^-}$ was found to be a dominant compound and its removal efficiency was 97-98% after the RO treatment. And a Fe(III) type of Polytetsu, which was the first to be tested in this paper, was found to be a better option than a Al(III) type of Poly Aluminium Chloride due to its greater coagulation efficiency and applicability at a broader range of pH than the Al(III) type. In addition, there was no noticeable change in oxidation reduction potential, suggesting that an additional process is required to oxidize non-ionic organic carbons (detected as total organic carbon).

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문제 정의

Based on the test results, the potential of the combined system was evaluated for a usable water production system from CSG water. Also, this paper presents the treatment efficiencies in terms of water quality requirements for water supply purposes such as industrial, agricultural and domestic uses.

제안 방법

Pre-determined conditions for the coagulation-flocculation process were used in this study. After confirming the coagulation areas, jar tests were carried out to obtain the coagulation efficiency with the concentration ranges of 10, 20, 30, 40 and 50 ppm at pH of 5, 7 and 9 for PAC and 4, 7 and 10 for Polytetsu [15].
In this paper, a combined system with a coagulation reactor, a two-stage PCF filtration system and a RO system was constructed and tested for CSG water treatment. To improve the PCF filtration efficiency, a Fe(III) type of Polytetsu was found to be a better option than a Al(III) type of PAC due to its greater coagulation efficiency and applicability at a broader range of pH than the latter.
NaHCO₃), colour, petroleum compounds and organic matter (as total organic carbon (TOC)) [3]. In this study, a coagulation reactor, a pore control fiber (PCF) filtration system (which need relatively small footprints [6]) and a RO system (which is effective in removing ionic compounds [7, 8]) were combined to treat CSG water. Linking with our previous results [9] that analysed Australian government policy on the beneficial usage of CSG water [10], this paper presents a CSG water treatment option which is based on domestic technologies.

이론/모형

As part of our endeavours, a Fe(III) type of Polytetsu was selected to find out its applicability. Pre-determined conditions for the coagulation-flocculation process were used in this study. After confirming the coagulation areas, jar tests were carried out to obtain the coagulation efficiency with the concentration ranges of 10, 20, 30, 40 and 50 ppm at pH of 5, 7 and 9 for PAC and 4, 7 and 10 for Polytetsu [15].

성능/효과

As the preliminary operation results showed no noticeable change in ORP, an additional process is required to oxidize non-ionic organic carbons (detected as TOC). From the measurement of OH^- , HCO₃^- and CO₃^2- in terms of M and P alkalinities, HCO₃^- was a dominant compound, being removed 97-98% with the RO process.

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