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

Öz

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

Abstract

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

Kaynakça

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