Bengisu ÇİFTÇİOĞLU GÖZÜAÇIK, Dilşad SOYLU, Çiğdem BALÇIK, Bahar ÖZBEY ÜNAL, Bülent KESKİNLER

Farklı Zn (II) konsantrasyonlarının gerçek endüstriyel atıksuların arıtılmasında organik madde bozunması ve nitrifikasyon prosesi üzerine etkisi

Bu çalışmada, farklı konsantrasyonlarda Zn (II) içeren üç gerçek endüstriyel atıksu, Zn (II)'nin organik madde bozunması ve nitrifikasyon prosesi üzerindeki etkilerini belirlemek için laboratuvar ölçekli ardışık kesikli biyoreaktör (AKR) ile arıtılmıştır. Zn (II)'nin nitrifikasyon performansı üzerindeki etkisi, amonyum oksitleyen bakterilerin (AOB) ve nitrit oksitleyen bakterilerin (NOB) biyoaktiviteleri ve çıkış suyu Zn (II) konsantrasyonu izlenerek belirlenmiştir. Farklı çinko konsantrasyonları içeren atıksu ile beslenen AKR'nin organik madde giderimlerinin yüksek benzerlik gösterdiği görülmüştür. 2.1, 1.2 ve 0.6 mg Zn (II)/L konsantrasyonunda çalıştırılan reaktörlerin amonyum giderme verimleri (AGV) sırasıyla %88.9±1.7, %89.8±1.0 ve %81.4±7.3 olarak gözlenmiştir. Bununla birlikte, nitrat dönüşüm oranı (NaDO) üzerinde dikkate değer bir etki tespit edilmiştir. NaDO sırasıyla 2.1, 1.2 ve 0.6 mg Zn (II)/L'lik bir konsantrasyon için %98.3±8.2, %47.5±11.4, %27.6±6.7 olmuştur. İlave olarak, Zn (II) konsantrasyonunun artmasıyla NOB biyoaktivitesinin iyileştiği sonucuna varılmıştır. Çıkış suyu Zn (II) konsantrasyonları, sırasıyla 2.1, 1.2 ve 0.6 mg Zn (II)/L'lik bir giriş konsantrasyonu için 0.67 mg/L, 0.33 mg/L ve 0.07 mg/L olarak ölçülmüştür. Giriş ve çıkıştaki çinko konsantrasyonlarının sonuçları, çinkonun biyofloklar üzerinde adsorbe edildiğini göstermiştir.

Anahtar Kelimeler:

Çinko, Aktif çamur, Nitrifikasyon, Toksisite

Effects of different concentration of Zn(II) on the organic material degradation and nitrification process in the treatment of real industrial wastewater

In this study, three real industrial wastewaters containing different concentration of Zn (II) were treated with lab-scale sequential batch bioreactor (SBR) to determine the effects of Zn (II) on the organic material degradation and nitrification process. The effects of Zn (II) on nitrification performance were determined by monitoring the bioactivities of ammonium oxidizing bacteria (AOB) and nitrite oxidizing bacteria (NOB), and effluent Zn (II) concentrations. It was observed that the organic matter removals of SBRs fed with wastewater containing different zinc concentrations show high similarity. Ammonium removal efficiencies (ARE) of reactors operated with a concentration of 2.1, 1.2, and 0.6 mg Zn (II)/L were observed as 88.9±1,7%, 89.8±1.0 % and 81.4±7.3 %, respectively. However, a remarkable effect on nitrate conversion rate (NaCR) was determined. NaCR was 98.3±8.2%, 47.5±11.4%, 27.6±6.7% for a concentration of 2.1, 1.2, and 0.6 mg Zn (II)/L, respectively. Additionally, it was concluded that NOB bioactivity and nitrate conversion rates were improved with increasing Zn (II) concentration. The effluent Zn (II) concentrations were measured as 0.67 mg/L, 0.33 mg/L and 0.07 mg/L for a influent concentration of 2.1, 1.2, and 0.6 mg Zn (II)/L, respectively. Results of the influent and effluent zinc concentrations showed that zinc was adsorbed on bioflocs

Keywords:

Zinc, Activated sludge, Nitrification, Toxicity,

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[1] Yang C, Wang J, Lei M, Xie G, Zeng G, Luo S. “Biosorption of zinc (II) from aqueous solution by dried activated sludge”. Journal of Environmental Sciences, 2(5), 675-680, 2010.
[2] Axtell NR, Sternberg SP, Claussen K. “Lead and nickel removal using Microspora and Lemna minör”. Bioresource Technology, 89(1), 41-48, 2003.
[3] Chua H, Yu PHF, Sin SN. Cheung, MWL. “Sub-lethal effects of heavy metals on activated sludge microorganisms”. Chemosphere, 39(15), 2681-2692, 1999.
[4] Codina JC, Perez-Garcia A, De Vicente A. “Detection of heavy metal toxicity and genotoxicity in wastewaters by microbial assay”. Water Science & Technology, 30(10), 145-151, 1994.
[5] Cabrero A, Fernandez S, Mirada F, Garcia J. “Effects of copper and zinc on the activated sludge bacteria growth kinetics”. Water Research, 32(5), 1355-1362, 1998.
[6] Dilek FB, Gokcay CF, Yetis U. “Combined effects of Ni (II) and Cr (VI) on activated sludge”. Water Research, 32(2), 303-312, 1998.
[7] Han JC, Liu Y, Liu X, Zhang Y, Yan YW, Dai RH, Zha XS, Wang CS. “The effect of continuous Zn (II) exposure on the organic degradation capability and soluble microbial products (SMP) of activated sludge”. Journal of Hazardous Materials, 244, 489-494, 2013.
[8] Shi XY, Sheng GP, Li XY, Yu HQ. “Operation of a sequencing batch reactor for cultivating autotrophic nitrifying granules”. Bioresource Technology, 101(9), 2960-2964, 2010.
[9] Duyar A, Ciftcioglu V, Civelekoglu G, Cirik K. “Performances of sequential denitrification and partial nitrification process for treatment of landfill leachate”. Pamukkale Üniversitesi Mühendislik Bilimleri Dergisi, 27(6), 737-743, 2021.
[10] Kapoor V, Li X, Elk M, Chandran K, Impellitteri CA, Santo Domingo JW. “Impact of heavy metals on transcriptional and physiological activity of nitrifying bacteria”. Environmental science & technology, 49(22), 13454-13462, 2015.
[11] Juliastuti SR, Baeyens J, Creemers C, Bixio D, Lodewyckx, E. “The inhibitory effects of heavy metals and organic compounds on the net maximum specific growth rate of the autotrophic biomass in activated sludge”. Journal of hazardous materials, 100(1-3), 271-283, 2003.
[12] Zhang X, Zhou Y, Zhang N, Zheng K, Wang L, Han G, Zhang H. “Short-term and long-term effects of Zn (II) on the microbial activity and sludge property of partial nitrification process”. Bioresource Technology, 228, 315-321, 2017.
[13] Zhang X, Chen Z, Zhou Y, Ma Y, Ma C, Li Y, Liang Y, Jia J. “Impacts of the heavy metals Cu (II), Zn (II) and Fe (II) on an Anammox system treating synthetic wastewater in low ammonia nitrogen and low temperature: Fe (II) makes a difference”. Science of the Total Environment, 648, 798-804, 2019.
[14] Yang C, Wang J, Lei M, Xie G, Zeng G, Luo S. “Biosorption of zinc (II) from aqueous solution by dried activated sludge”. Journal of Environmental Sciences, 22(5), 675-680, 2010.
[15] Çeçen F, Semerci N, Geyik AG. “Inhibitory effects of Cu, Zn, Ni and Co on nitrification and relevance of speciation”. Journal of Chemical Technology & Biotechnology, 85(4), 520-528, 2010.
[16] Feng B, Fang Z, Hou J, Ma X, Huang Y, Huang L. “Effects of heavy metal wastewater on the anoxic/aerobicmembrane bioreactor bioprocess and membrane fouling”. Bioresource Technology, 142, 32-38, 2013.
[17] Madoni P, Davoli D, Guglielmi L. “Response of SOUR and AUR to heavy metal contamination in activated sludge”. Water Research, 33(10), 2459-2464, 1999.
[18] Zhang ZZ, Zhang QQ, Xu JJ, Deng R, Ji ZQ, Wu YH, Jin RC. “Evaluation of the inhibitory effects of heavy metals on anammox activity: a batch test study”. Bioresource Technology, 200, 208-216, 2016.
[19] Daverey A, Chen YC, Sung S, Lin JG. “Effect of zinc on anammox activity and performance of simultaneous partial nitrification, anammox and denitrification (SNAD) process”. Bioresource Technology, 165, 105-110, 2014.
[20] Baird R, Bridgewater L. American Public Health Association. Standard Methods for the Eamination of Water and Wastewater. 23th ed. Washington, DC, American public Health Association 2017.
[21] Zhang X, Chen Z, Zhou Y, Ma Y, Ma C, Li Y, Liang Y, Jia J. “Impacts of the heavy metals Cu (II), Zn (II) and Fe (II) on an Anammox system treating synthetic wastewater in low ammonium nitrogen and low temperature: Fe (II) makes a difference”. Science of the Total Environment, 648, 798-804, 2019.