Removal of salicylic acid from aqueous solutions by electrocoagulation processes using hybrid electrode

Abstract

In this study, salicylic acid, an important and widely used micropollutant in the pharmacy sector, removal by electrocoagulation process was investigated. Electrocoagulation and electroflotation processes are commonly used techniques in electrochemical treatment. The type of electrode material employing in electrochemical processes is one of the basic variables which determining the process performance. In the experiments, iron and aluminum plates were employed as a hybrid electrode combination in the electrocoagulation process. The effect of current density, initial pH, electrolysis time, and electrical conductivity were investigated. For this purpose, the current density was 20 A/m2 and 100 A/m2, initial pH 5-8, electrolysis time 2-50 min electrical conductivity 250-1000 µs/cm range and electrode connection type monopolar parallel (MP-P) salicylic acid removal efficiencies from aqueous solutions were investigated during the experimental studies. The best removal results were obtained at pH 6 with a current density of 80 A/m2, solution conductivity of 750 µs/cm, and 40 min of electrolysis time. In these operation conditions, operation cost, amount of sludge, and removal efficiency of salicylic acid were determined as 1.34 $/m3, 0.8 kg/m3, and 91.4%, respectively.

Keywords

• Hybrid electrode
• Electrocoagulation
• Salicylic acid
• Micropollutant.

Hibrit olarak alüminyum ve demir elektrotlar kullanarak elektrokoagulasyon prosesleri ile sulu çözeltilerden salisilik asit gideriminin araştırılması

Öz

Bu çalışmada, elektrokoagulasyon prosesiyle sulu çözeltilerden önemli ve yaygın olarak kullanılan bir mikrokirletici sınıfına giren ve ilaç etken maddesi olan sulu çözeltilerden salisilik asittin giderimi araştırılmıştır. Elektrokimyasal arıtma proseslerinde yaygın olarak kullanılan arıtma prosesleri elektrokoagulasyon ve elektroflotasyon teknikleridir. Elektrokimyasal proseslerde proses verimini belirleyen en temel değişkenlerden birisi, kullanılan elektrot materyalinin cinsidir. Bu çalışmada elektrokoagulasyon prosesiyle hibrit olarak demir ve alüminyum elektrot kombinasyonu kullanılmıştır. Elektrokoagulasyon prosesine etki eden parametrelerden akım yoğunluğu, başlangıç pH, elektroliz süresi ve elektriksel iletkenliğin etkisi salisilik asit giderim verimi üzerine etkisi araştırılmıştır. Bu amaçla elektrokoagulasyon (EC) prosesinde akım yoğunluğu 20 A/m2 ve 100 A/m2 değerinde, başlangıç pH 5-8, Elektroliz süresi 2-50 dakika, elektriksel iletkenlik 250-1000 µs/cm aralığında ve elektrotlar monopolar paralel (MP-P) bağlantı türünde bağlanarak sulu çözeltilerden salisilik asit giderme verimleri incelenmiştir. En yüksek giderme verimi pH 6, Akım yoğunluğu 80 A/m2, çözelti iletkenliği 750 µs/cm, ve Elektroliz süresi 40 dakika olarak elde edilmiştir. Bu işletme şartlarında %91.4 Salisilik asit giderimi, 0.8 kg/m3 çamur oluşumu ve 1.34 $/m3 işletme maliyeti bulunmuştur.

Anahtar Kelimeler

• Hibrit elektrot
• elektrokoagulasyon
• , salisilik asit
• mikrokirletici

Kaynakça

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