Geosmin and 2-methylisoborneol adsorption on super-powdered activated carbon in the presence of natural organic matter

Matsui, Yoshihiko; Nakano, Yuuta; Hasegawa, Hiroshi; Ando, Naoya; Matsushita, Taku; Ohno, Koichi

doi:10.2166/wst.2010.415

Cited by 17 publications

(13 citation statements)

References 6 publications

(8 reference statements)

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“…The pore size distribution of activated carbon particles is an important parameter related to their equilibrium adsorption capacity. It has been reported previously that the change in carbon particle size by micro-milling does not result in any substantial change in pore size distribution (Ando et al, 2010;Matsui et al, 2015). The results of our study also confirmed that the pore size distributions were similar for different-size particles (PAC, SPAC, and SSPAC) with the same age, although experimental errors were apparent in the data for oneyear-old carbon ( Fig.…”

Section: Pore Size Distributionssupporting

confidence: 91%

“…Equilibrium adsorption capacities in our study also increased with decreasing carbon particle size. A similar phenomenon has been reported for virgin PAC and its SPAC (Matsui et al, 2010;Matsui et al, 2012) as well as for one-year-old used GAC and its PAC (Hu et al, 2015;Knappe et al, 1999).…”

Section: Mib Adsorption Capacitysupporting

confidence: 77%

“…Of relevance to the carbon-size-dependency is the fact that early researchers discovered that some hydrophobic organic micro-pollutants and high-MW compounds were adsorbed mainly on the exterior of carbon particles due to their limited penetration distances (Matsui et al, 2013a;Matsui et al, 2014). The capacity of MIB, geosmin, and humic substances to adsorb onto GAC and PAC would thus increase when the GAC/PAC particle was milled to a smaller size (Amaral et al, 2016;Ando et al, 2010;Bonvin et al, 2016;Knappe et al, 1999;Matsui et al, 2015;Matsui et al, 2013b). The high dependencies on carbon particle size of the capacities of MIB, geosmin, PSS-6400, and ABS to adsorb onto spent carbons (Fig.…”

Section: Influence Of Adsorbate Properties On Adsorption Capacitymentioning

confidence: 99%

“…Particle size reduction, moreover, can be expected to enhance adsorption capacities as well as adsorption kinetics (Bonvin et al, 2016;Hu et al, 2015;Knappe et al, 1999;Matsui et al, 2010). Enhancement of adsorption capacity may be mandatory for reuse of spent GAC because even very high kinetics cannot compensate for the disadvantage of inadequate capacity.…”

Section: Introductionmentioning

confidence: 99%

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Micro-milling of spent granular activated carbon for its possible reuse as an adsorbent: Remaining capacity and characteristics

et al. 2017

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We milled granular activated carbons (GACs) that had been used for 0-9 years in water treatment plants and produced carbon particles with different sizes and ages: powdered activated carbons (PAC, median diameter 12-42 μm), superfine PAC (SPAC, 0.9-3.5 μm), and submicron-sized SPAC (SSPAC, 220-290 nm). The fact that SPAC produced from 1-year-old GAC and SSPAC from 2-year-old GAC removed 2-methylisoborneol (MIB) from water with an efficiency similar to that of virgin PAC after a carbon contact time of 30 min suggests that spent GAC could be reused for water treatment after being milled. This potential for reuse was created by increasing the equilibrium adsorption capacity via reduction of the carbon particle size and improving the adsorption kinetics. During long-term (>1 year) use in GAC beds, the volume of pores in the carbon, particularly pores with widths of 0.6-0.9 nm, was greatly reduced. The equilibrium adsorption capacities of the carbon for compounds with molecular sizes in this range could therefore decrease with increasing carbon age. Among these compounds, the decreases of capacities were prominent for hydrophobic compounds, including MIB. For hydrophobic compounds, however, the equilibrium adsorption capacities could be increased with decreasing carbon particle size. The iodine number, among other indices, was best correlated with the equilibrium adsorption capacity of the MIB and would be a good index to assess the remaining MIB adsorption capacity of spent carbon. Spent GAC can possibly be reused as SPAC or SSPAC if its iodine number is ≥ 600 mg/g.

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Section: Pore Size Distributionssupporting

confidence: 91%

Section: Mib Adsorption Capacitysupporting

confidence: 77%

Section: Influence Of Adsorbate Properties On Adsorption Capacitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Micro-milling of spent granular activated carbon for its possible reuse as an adsorbent: Remaining capacity and characteristics

et al. 2017

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“…Toz aktif karbon (TAK), içme suyu arıtımında sıklıkla tercih edilen bir fizikokimyasal arıtım yöntemidir [72]. Toz aktif karbon ile Geosmin ve 2-MIB gibi tat ve koku oluşturan bileşiklerin giderilmesinin incelendiği birçok çalışmanın [11], [41], [73], [74] Li [97]'nin yürüttüğü bir başka çalışmada da, Ti/RuO2-Pt anot ile NaCl kullanımıyla Geosmin konsantrasyonunun 600 ng/L'den 6 ng/L'ye düştüğü görülmüştür.…”

Section: Toz Aktif Karbonunclassified

Evaluation of algae related taste and odor problem in drinking water

Fakıoğlu¹,

Karpuzcu²,

Öztürk³

2018

Pamukkale J Eng Sci

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İçme suyu, su kaynağından tüketici musluğuna ulaştırılana kadar birçok aşamadan geçmektedir. Suyun kalitesi; su kaynağındaki su kalitesine, arıtma tesisinde uygulanan proseslere ve su dağıtım şebekesinin durumuna bağlıdır. Arıtılmış suda istenmeyen tat ve koku, tüketicideki içilebilir su algısını etkilemekte ve tüketicinin musluk suyu tüketimi ile sağlık riskini ilişkilendirmesine sebep olabilmektedir. Bu durum, su temini tesislerine olan tüketici güveninin azalmasına yol açabilmektedir. Söz konusu sorunun çözümü için su otoritelerince sorunun kaynağı araştırılmakta, buna eş zamanlı olarak arıtma tesislerine kolay entegre edilebilecek sistemler üzerinde çalışılmaktadır. Bu bağlamda, havzada sorunun kaynağının tespiti ve sonrasında alınacak önlemler büyük önem taşımaktadır. Ayrıca su arıtma tesislerinde tesis işletiminden kaynaklanan tat ve kokunun önüne geçilmeye çalışılmakta, bunun yanısıra 10 ng/L konsantrasyonun altında bile insanlar tarafından algılanabilen 2-MIB ve Geosmin bileşiklerinin oksidasyon, adsorpsiyon veya biyofiltrasyon gibi proseslerle giderimi incelenmektedir. Öte yandan, arıtılarak şebekeye verilen suda biyolojik aktiviteden veya dezenfeksiyon yan ürün oluşumundan kaynaklanan tat ve koku oluşumu da önlenmelidir. Bu çalışmada, suyun havzadan musluğa yolculuğu boyunca suda oluşabilecek tat ve koku probleminin etmenleri ve bu soruna yönelik çözüm yolları incelenmiştir. Source water goes through several processes before reaching to the customer's tap. Quality of water which flows through the tap is directly related to the water quality in the reservoir, processes used in the drinking water treatment plant and the condition of the present distribution system. Taste and odor in the treated water affects the perception of the drinking water for the customers and causes them to relate it with health risks. This results with a decline in consumer reliance to the water supply system. Water authorities are not only searching for the cause of the problem, but also trying to find a solution which can be integrated to the existing Water Treatment Plant system. In this context, problems related with watershed should be determined and precautions should be taken based on these issues. In WTP's, taste and odor problem caused by wrong plant operations should be avoided while treatment processes such as oxidation, adsorption and biofiltration processes should be tested for the removal of 2-MIB and Geosmin which can be percieved by the humanbeings even at 10 ng/L. Also, taste and oodor occurance in treated water caused by biological activity or DBP's in distribution systems should be avoided. In this study, potential causes of taste and odor occurance during the travel of water from reservoir to consumer's tap is stated along with the solutions.

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Implications for emergency response to the severe odor incident occurred in source water: Potential odorants and control strategy

Guo

Chen

et al. 2021

Environ Sci Pollut Res

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Sudden odor incidents occurring in the source water have been a severe problem for water suppliers. In order to apply emergency control measures effectively, it is necessary to identify the target compounds responsible for odor incidents rapidly. The present work identi ed the odorants and explored emergency disposal mechanisms for sudden and severe odors in the QT River's drinking water source (HZ city, China). Medicinal, chemical, septic, and musty odors with strong intensities were detected in the source water. The effect of conventional treatments of drinking water treatment plant (DWTP) on odors' removal was limited, which was evident by the presence of medicinal, chemical, and musty odors with moderate intensities in the e uent of DWTP. Total seventeen odorants were identi ed successfully in the source water of QT River and the e uent of DWTP. The measured OAVs and reconstituting the identi ed odorants explained 87%, 87%, 89%, and 94% of medicinal, chemical, septic, and musty odors, respectively, in the source water of the QT River and 90%, 87%, and 88% of medicinal, chemical, and musty odors in the e uent. Styrene, phenol, 2-chlorophenol, 2-tertbutylphenol, and 2-methylphenol were associated with the medicinal odor, while propyl sul de, diethyl disul de, propyl disul de, and indole were related to the septic odor. Geosmin and 2-methylisoborneol (2-MIB) were responsible for the musty odor, and cyclohexanone, 1,4-dichlorobenzene, and nitrobenzene were involved with the chemical odor. Based on the characteristics of identi ed odorants, powdered activated carbon (PAC) was applied to control the odors in the QT River. The results indicated that the medicinal, chemical, septic, and musty odors could be removed entirely after adding 15 mg/L PAC, which effectively controlled emergency odor problems. Overall, the study would offer a scienti c basis and operational reference for emergency odor management and control in DWTP with similar complicated odor incidents.

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Geosmin and 2-methylisoborneol adsorption on super-powdered activated carbon in the presence of natural organic matter

Cited by 17 publications

References 6 publications

Micro-milling of spent granular activated carbon for its possible reuse as an adsorbent: Remaining capacity and characteristics

Micro-milling of spent granular activated carbon for its possible reuse as an adsorbent: Remaining capacity and characteristics

Evaluation of algae related taste and odor problem in drinking water

Implications for emergency response to the severe odor incident occurred in source water: Potential odorants and control strategy

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