Investigation of minimization and reusablility of the reject from electrodialysis processes: an example textile wastewater

Year 2017, Volume: 21 Issue: 5, 943 - 950, 01.10.2017

Fatih İlhan

https://doi.org/10.16984/saufenbilder.304492

Abstract

Membarane processes are widely used in both drinking water treatment and wastewater treatment. This method is separation process, in the most general sense, rather than treatment. In the meantime, it is not possible to avoid reject formation. For this reason, the biggest problem is the extra effort required to remove the reject from the membrane processes. In this case, the use of new membrane processes and new operation methods are needed. For this reason, at the first stage, textile wastewater were treated by classical electrodialysis (CED) process. 10% (1 L wastewater / 0.1 L rejected portion) of the concentrate stream was generated from this process. Utilizing the reject, 15 L of wastewater treatment was realized. At this point, the concentrate stream can be reduced to 0.67%. Likewise, in the bipolar membrane electrodialysis (BMED) process, when the initial solution of anolite and catholyte was placed as a 0.1L initial solution, the reject flow (20 L wastewater, 0.1 L anolite, 0.1 L catholyte) could be reduced to 1%. In this study, it was observed that the reject stream could be used repeatedly and minimized in the electrodialysis processes. At the same time, mixed acidic and alkaline solutions with pH value of 0,32 M H+ and 0,38 M OH- value were obtained by BMED process. According to the initial values, 47.5 times (0.38 / 0.008) and (0.32 / 0.009) 35.6 times more concentrated alkaine and acidic solutions were obtained

Keywords

Membrane processes, electrodialysis, reject, bipolar membrane electrodialysis, acid-base rexovery

Elektrodiyaliz proseslerinden kaynaklanan konsantre akımın minimizasyonu ve yeniden kullanılabilirliğinin incelenmesi: Tekstil atıksuyu örneği

Abstract

 Membran prosesler hem içme suyu arıtımında hem de atıksu
arıtımında yaygın olarak kullanılmaktadır. Bu arıtım yöntemi en genel anlamda
arıtımdan ziyade bir ayırma prosesidir. Yalnız bu arada da konsantre oluşumunun
önüne geçmek mümkün olmamaktadır. Bu nedenden ötürü en büyük problem olarak
membran proseslerden kaynaklanan konsantre kısmın arıtımı için de ekstra çaba
sarf edilmektedir.  Bu durumda yeni
membran proseslerin kullanımına ve yeni çalışma metotlarına ihtiyaç
duyulmaktadır. Bu nedenle ilk olarak klasik elektrodiyaliz (KED) prosesi ile
çalışılmıştır. Bu proseste oluşan konsantre akım oranı %10 (1L atıksu /0,1 L
konsantre kısım), konsantre akım tekrar tekrar kullanılarak 15 L atıksu arıtımı
gerçekleştirilmiş ve konsantre akım 
%0,67 oranına kadar indirgenebilmiştir. Benzer şekilde bipolar membranlı
elektrodiyaliz (BMED) prosesinde de anolit ve katolit olarak 0,1L başlangıç
çözeltisi konulduğunda tekrarlı arıtım sonucunda konsantre akım(20 L atıksu,
0,1 L anolit,0,1 L katolit) %1 seviyelerine kadar indirgenebilmiştir. Bu
çalışmada konsantre akımın elektrodiyaliz proseslerinde tekrar tekrar
kullanılabileceği ve minimize edilebileceği görülmüştür. Aynı zamanda BMED
prosesi ile  PH değeri 0,32 M H+  ve 0,38 M OH- değerine sahip karışık asidik
ve alkali çözeltiler elde edilmiştir. Başlangıç değerlerine bakıldığında 47,5
kat (0,38/0,008) ve (0,32/0,009)  35,6
kat daha yoğun alkali ve asidik çözeltiler elde edilebilmiştir.

Keywords

Membran Prosesler, elektrodiyaliz, konsantre akım, bipolar membran elektrodiyaliz, ast-baz ger, kazanımı

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