Çinko Ekstraksiyon Atığı Kullanılarak Sulu Çözeltilerden Fosfat Gideriminin Araştırılması

Öz

Çinko üretim tesislerinde açığa çıkan ve içerdikleri metaller nedeniyle tehlikeli atık olarak sınıflandırılan katı liç artıklarının çevre ve insan sağlığına zarar vermeden ekonomik olarak değerlendirilmesi atık yönetimi açısından önemlidir. Bu kalıntıların bertarafı çoğu zaman özel teknolojiler gerektirse de, bu teknolojilerin pahalı olması ve bazı durumlarda yasal yaptırımların yetersiz kalması nedeniyle tehlikeli atıklar çevreye veya çöp depolama alanlarına bırakılmaktadır. Bu nedenle bu kalıntıların değerlendirilerek sanayiye kazandırılması ekonomik ve çevresel açıdan önemlidir. Bu çalışmada, Kayseri Çinkur işletmesinden getirilen çinko ekstraksiyonu üretimi sırasında oluşan kurşun keki kullanılmıştır. Bu atık, çinko ve demirin yanı sıra yüksek miktarda kurşun da içerdiğinden, sulu çözeltilerden fosfatın uzaklaştırılması koşulları araştırıldı. Elde edilen toplu test sonuçları kullanılarak fosfat giderme adsorpsiyon izotermleri elde edildi. Ayrıca fosfat giderimine ilişkin bazı termodinamik büyüklükler de hesaplanmıştır. Deney sonucunda sulu çözeltilerden P giderim veriminin önemli ölçüde çözelti pH'ına ve atık kurşun keki dozuna bağlı olduğu belirlendi. Ayrıca sulu çözeltilerden fosfat gideriminin Langmuir ve Freundlich izotermine uyduğu belirlendi. Ayrıca 120 dakikalık bir süre sonunda fosfat adsorpsiyon dengesinin kurulduğu gözlendi. pH’ı 7.69 olan 100 mg/L fosfat çözeltisinin herhangi bir ilave olmaksızın 20 g/L kurşun keki ile karıştırılması ve 120 dakika süreyle temas ettirilmesiyle fosfatın yaklaşık %74’ü adsorpsiyonla etkili bir şekilde giderilebilir.

Anahtar Kelimeler

• Ekstraksiyon kalıntısı
• Liç
• Kurşun
• Fosfat adsorpsiyonu
• Atık

Investigation of Phosphate Removal from Aqueous Solutions Using Zinc Extraction Waste

Öz

It is important for waste management to economically evaluate the solid leach residues released in zinc production facilities and classified as hazardous waste due to the metals they contain, without harming the environment and human health. Although the disposal of these residues often requires special technologies, hazardous wastes are left to the environment or landfills due to the expense of these technologies and the inadequacy of legal sanctions in some cases. For this reason, it is important from an economic and environmental perspective to evaluate these residues and bring them into the industry. In this study, lead cake formed during zinc extraction production, brought from Kayseri Çinkur enterprises, was used. Since this waste contains high amounts of lead as well as zinc and iron, the conditions for removing phosphate from aqueous solutions were investigated. Phosphate removal adsorption isotherms were obtained using the obtained batch test results. Additionally, some thermodynamic quantities regarding phosphate removal were calculated. As a result of the experiment, it was determined that the P removal efficiency from aqueous solutions significantly depends on the solution pH and the dose of waste lead cake. It was also determined that phosphate removal from aqueous solutions obeyed the Langmuir and Freundlich isotherm. Additionally, it was observed that phosphate adsorption equilibrium was established after a period of 120 min. By mixing 100 mg/L phosphate solution with pH 7.69 with 20 g/L lead cake without any addition and contacting for 120 minutes, approximately 74% of the phosphate can be effectively removed by adsorption.

Anahtar Kelimeler

• Extraction residue
• Leaching
• Lead
• Phosphate adsorption
• Waste

Kaynakça

1. V. Kuroki, G. E. Bosco, P. S. Fadini, A. A. Mozeto, A. R. Cestari, and W. A. Carvalho, "Use of a La (III)-modified bentonite for effective phosphate removal from aqueous media," Jour. of Hazar. Mater., vol. 274, pp. 124-131, 2014.
2. J. Diao, L. Shao, D. Liu, Y. Qiao, W. Tan, L. Wu, and B. Xie, "Removal of phosphorus from leach liquor of steel slag: Adsorption dephosphorization with activated alumina," JOM, vol. 70, pp. 2027-2032, 2018.
3. J. Xiong, Z. He, Q. Mahmood, D. Liu, X. Yang, and E. Islam, "Phosphate removal from solution using steel slag through magnetic separation," Jour. of Hazar. Mater., vol. 152, no. 1, pp. 211-215, 2008.
4. M. Kondalkar, U. Fegade, S. Attarde, and S. Ingle, "Phosphate removal, mechanism, and adsorption properties of Fe-Mn-Zn oxide trimetal alloy nanocomposite fabricated via co-precipitation method," Separ. Sci.and Tech., vol. 54, no. 16, pp. 2682-2694, 2019.
5. R. Fan, C. Chen, J. Lin, J. Tzeng, C. Huang, C. Dong, and C. Huang, "Adsorption characteristics of ammonium ion onto hydrous biochars in dilute aqueous solutions," Bior. Tech., vol. 272, pp. 465-472, 2019.
6. J. Jang and D. S. Lee, "Effective phosphorus removal using chitosan/Ca-organically modified montmorillonite beads in batch and fixed-bed column studies," Jour. of Hazar. Mater., vol. 375, pp. 9-18, 2019.
7. H. Yoshida and W. A. Galinada, "Equilibria for adsorption of phosphates on OH‐type strongly basic ion exchanger," AIChE Jour., vol. 48, no. 10, pp. 2193-2202, 2002.
8. H. S. Altundoğan and F. Tümen, "Removal of phosphates from aqueous solutions by using bauxite. I: Effect of pH on the adsorption of various phosphates," Jour. of Chem. Tech. & Biotec., vol. 77, no. 1, pp. 77-85, 2002.

9. H. S. Altundoğan and F. Tümen, "Removal of phosphates from aqueous solutions by using bauxite II: The activation study," Jour. of Chem. Tech. & Biotec., vol. 78, no. 7, pp. 824-833, 2003.
10. Y. Li, C. Liu, Z. Luan, X. Peng, C. Zhu, Z. Chen, Z. Zhang, J. Fan, and Z. Jia, "Phosphate removal from aqueous solutions using raw and activated red mud and fly ash," Jour. of Hazar. Mater., vol. 137, no. 1, pp. 374-383, 2006.
11. Y. Liu, X. Sheng, Y. Dong, and Y. Ma, "Removal of high-concentration phosphate by calcite: Effect of sulfate and pH," Desal., vol. 289, pp. 66-71, 2012.
12. K. Karageorgiou, M. Paschalis, and G. N. Anastassakis, "Removal of phosphate species from solution by adsorption onto calcite used as natural adsorbent," Jour. of Hazar. Mater., vol. 139, no. 3, pp. 447-452, 2007.
13. M. Li, J. Liu, Y. Xu, and G. Qian, "Phosphate adsorption on metal oxides and metal hydroxides: A comparative review," Environ. Rev., vol. 24, no. 3, pp. 319-332, 2016.
14. H. Liu, X. Sun, C. Yin, and C. Hu, "Removal of phosphate by mesoporous ZrO2," Jour. of Hazar. Mater., vol. 151, nos. 2-3, pp. 616-622, 2008.
15. W. Huang, S. Wang, Z. Zhu, L. Li, X. Yao, V. Rudolph, and F. Haghseresht, "Phosphate removal from wastewater using red mud," Jour. of Hazar. Mater., vol. 158, no. 1, pp. 35-42, 2008.
16. H. Yin, Y. Yun, Y. Zhang, and C. Fan, "Phosphate removal from wastewaters by a naturally occurring, calcium-rich sepiolite," Jour. of Hazar. Mater., vol. 198, pp. 362-369, 2011.
17. T. Nguyen, H. Ngo, W. Guo, J. Zhang, S. Liang, D. J. Lee, P. Nguyen, and X. Bui, "Modification of agricultural waste/by-products for enhanced phosphate removal and recovery: Potential and obstacles," Biores. Techn., vol. 169, pp. 750-762, 2014.
18. APHA-AWWA/WEF, Standard Methods for the Examination of Water and Wastewater, 20th Edition, Washington DC, USA: American Public Health Association, 1998.