Abstract Taste and odor in drinking water are one of the main problems of water supply and treatment sector. Peroxone is an effective advanced oxidation process, which combines ozone with hydrogen peroxide to create hydroxyl radicals that decompose organic compounds. 2-Methylisoborneol (2-MIB) is one of the significant taste and odor causing compounds, which can be removed with peroxone process. In this study, removal of 2-MIB compound by peroxone process was investigated in a pilot scale treatment plant and optimum operational conditions were determined. For safety reasons, it is important that residual O3 and H2O2 concentrations in the water leaving the reactor should not exceed to 0.1 and 0.5 mg/L, respectively. Results indicate that while dissolved ozone concentration was below the indicated limit for all experiments, concentrations over 0.5 mg/L residual H2O2 were observed during the experiments with a H2O2:O3 ratio of 0.5. This limit exceedance affected the decision of the ideal peroxone ratio along with the 2-MIB removal results. Therefore; optimum H2O2:O3 ratio was determined as 0.3. 2-MIB removal efficiency of 81% was achieved at the optimum H2O2:O3 ratio with a contact time of 15 min. According to the results, 2-MIB removal rate had a linear correlation with the contact time.

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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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