Yazar "Karaca, Feriha" seçeneğine göre listele

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  • Küçük Resim
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    Deri endüstrisi proses atıksularının koagülasyon, UV/PS ve nanofiltrasyon yöntemi ile arıtımı
    (Tekirdağ Namık Kemal Üniversitesi, 2022) Karaca, Feriha; Dinçer, Ali Rıza; Çifçi, Deniz İzlen
    Deri endüstrisi üretim prosesi adımlarından kaynaklı kirlilik seviyesi yüksek atıksu oluşturmaktadır. İçerisinde bulunan proteinler, yağ, krom bileşikleri, kireç, sodyum sülfat ve sodyum hidroksit, hacimleri çok fazla ve en önemli kirlilik parametrelerindendir. Bu çalışmada, deri endüstrisinin üç aşamasında bulunan yıkama, pikle ve yağ giderme ünitelerinden kaynaklanan atıksular ile çalışma yapılmıştır. Bu atıksuların alum ile çöktürme işleminden sonra persülfat (UV/PS) ile kirlilik giderimi ve en son adım olarak nanofiltrasyon yapılarak atıksu arıtımı araştırılmıştır. KOİ sonuçları ile karşılaştırılması yapılarak optimum miktarlar belirlenmiştir. Atıksuyun geri kazanımı amacıyla öncelikle alum ile çöktürme yapılarak optimum tercih edilen 100 mg/L alum konsantrasyonu ve pH 7 belirlenmiştir. UV/PS oksidasyon çalışmalarında, Yıkama ünitesi atıksuyu için 8000 mg/L S2O8 konsantrasyonu ve pH 8 ve Yağ giderme ünitesi atıksuyu için 16000 mg/L S2O8 konsantrasyonu ve pH 6 optimum seçilmiştir. Pikle ünitesi atıksuyu için UV/PS oksidasyonu verimsizliği gözlemlenmiştir. Nanofiltrasyon sistemi ile 4 bar basınç altında NP030 filtresi kullanılarak farklı pH'larda KOİ giderimi karşılaştırılması yapılmıştır. Yıkama ve Yağ giderme ünitelerinde en iyi KOİ giderim verimi pH 7 değerinde elde edilmiştir. Sonuç olarak deri üretimi sırasında yıkama ve yağ giderme ünitelerinde oluşan atıksuların koagülasyon, UV/PS ve nanofiltrasyon sistemi ile oluşan atıksuyun geri kazanımı mümkün olduğu görülmüştür.
  • Küçük Resim Yok
    Öğe
    Treatment of Leather Industry Wastewater Using Coagulation, Ultraviolet/Persulfate Processing and Nanofiltration for Water Recovery
    (Pleiades Publishing Inc, 2024) Dincer, Ali Riza; Cifci, Deniz Izlen; Karaca, Feriha
    This study investigated water recovery with the treatment of leather industry processes wastewater (washing, pickling, and degreasing units) using coagulation, ultraviolet/persulfate (UV/PS) treatment, and nanofiltration processes. Coagulation studies were carried out using alum as the coagulant, and the highest chemical oxygen demand (COD) removal efficiency was obtained at pH 7 for all the wastewater. The highest COD and total organic carbon (TOC) removal were 80.9 and 50.5% in the wastewater washing unit (S2O82-: 8 g/L, pH 7) and 76.5 and 96.1% in the wastewater degreasing unit (S2O82-: 16 g/L, pH 6) using UV/PS oxidation, respectively. High COD and TOC removal could not be achieved with UV/PS oxidation in the wastewater pickling unit. In the studies performed with NP030 nanofiltration membrane after UV/PS oxidation, the highest permeability and COD removal was achieved at pH 7 under 4 x 10(5) Pa pressure in wastewater washing and degreasing units. After 75 min of nanofiltration at pH 7 in washing and degreasing units, the total filtrate amount was 39.8 and 42.3 L/m(2) h, respectively. COD concentration in the wastewater washing unit decreased from 4434 to 138 mg/L, while it decreased from 5833 to 212 mg/L in the wastewater degreasing unit with coagulation, UV/PS processing, and nanofiltration. As a result, the treatment of leather industry wastewater through separate streams with coagulation, UV/PS, and nanofiltration, washing, and degreasing unit wastewater provides very high COD removal. Also, it has been shown impossible to treat the pickling unit wastewater by UV/PS oxidation.
  • Küçük Resim
    Öğe
    Treatment of organic peroxide containing wastewater and water recovery by fenton-adsorption and fenton-nanofiltration processes
    (Academic Press Ltd- Elsevier Science Ltd, 2021) Dinçer, Ali Rıza; Çifçi, Deniz İzlen; Cinkaya, Demet Darcan; Dülger, Ender; Karaca, Feriha
    Treatment of organic peroxide-containing chemical industry wastewater by oxidation methods and recovery of water by the adsorption and nanofiltration (NP010) methods were investigated in this study. The COD and TOC removal rates were obtained as 72.8% and 58.0% in Fenton oxidation and were improved to 78.8% and 59.2% using photo-Fenton oxidation in the same conditions after 5 h of oxidation, respectively. The Fenton-treated wastewater was passed through nanofiltration to remove the organics and recover of the wastewater. The maximum COD removal efficiency of the NP010 membrane varied between 25% and 30% at all pH values. At low and high pH values (pH: 2.5 and pH: 11), as the filtration time increased, the COD removal efficiencies increased, and the highest COD removal efficiencies were obtained in the 180th and 210th minutes. The increase in the COD removal over time at low and high pH was related to the thickness of the filter layer and surface load balance accumulated on the filter surface. By Fenton oxidation coupling with adsorption, 81% of COD (decreased from 10,055 mg/L to 1906 mg/L) and 75.2% of TOC (decreased from 2597 mg/L to 645.4 mg/L) removal could be obtained, while 83.3% of COD (decreased from 9978 mg/L to 1664 mg/L) and 71.1% of TOC (decreased from 2597 mg/L to 750 mg/L) removal could be achieved using Fenton oxidation coupling with nanofiltration (P: 4 bar, pH: 11). In nanofiltration, the filtrate amounts were measured as 41.11 L/m(2).h and 38.33 L/m(2).h, respectively, at 4 bar and 6 bar of filter pressure and 30 min of filtration time. The increase in filtration time and filter pressure caused a decrease in the amount of the filtrate due to the rapid clogging of the filter pores.