Factors Affecting Efficiency of Synthetic Polymers in Flocculation

Year 2022, , 961 - 971, 31.12.2022

Noyan Akray Tayfun Şengül

https://doi.org/10.35193/bseufbd.1146333

Abstract

Polymers are effective products widely used in the solid-liquid separation of industrial wastes. Making solid-liquid separation in the wastes ensures that the wastes can be stored more regularly and efficiently, while removing the high water content from the landfill makes the accumulated wastes not a threat to the environment and reduces the waste volume by a significant amount, thus reducing the storage costs. Polymer performance is measured by turbidity tests. Many factors affect the effectiveness of the polymers used in solid-liquid separation, such as mixing speed, mixing time, settling time of slurry, temperature, and storage time which is the time elapsed between the use of the solid polymer after it has been prepared as a liquid solution. In this experimental study, the waste obtained from the tailings dam of the Kütahya Espey boron enrichment (concentrator) plant in its natural form, representing an industrial waste, was first dried, and then a waste ground suspension was prepared by taking the water/soil ratio in the tailings dam into account. The factors affecting the polymer performance in solid-liquid separation were determined by mixing four anionic polymers with different molecular weights into the prepared soil suspension. According to the findings, the ideal mixing speed has been determined to be 200-250 rpm, the mixing time as 1-3 minutes, and the settling time of the suspension between 2-4 minutes. Also, the suspension temperature was found to be a factor that could affect the turbidity and flocculation according to the polymer type. Moreover, the polymer solution can be used for 7 days without a decrease in its effectiveness, 24 hours after it is prepared.

Keywords

Anionic Polymer, Industrial Waste, Flocculation, Turbidity, Jar Test

Sentetik Polimerlerin Flokülasyonda Verimliliğini Etkileyen Faktörler

Abstract

Polimerler endüstriyel atıkların katı sıvı ayrımında yaygın bir şekilde kullanılan etkili ürünlerdir. Atıklarda katı-sıvı ayrımının yapılması, atıkların daha düzenli ve kolay depolanabilmesini sağlamasının yanında, yüksek su içeriğinin depolama sahasından uzaklaştırılması depolanan atıkları çevreye tehdit olmaktan çıkararak atık hacmini önemli bir miktarda düşürerek depolanma maliyetlerini azaltır. Polimer performansı bulanıklık deneyleri ile ölçülmektedir. Katı sıvı ayrımında kullanılan polimerlerin etkinliğini, karıştırma hızı, karıştırma süresi, çökelme süresi, sıcaklık ve katı formdaki polimerin sıvı çözelti halinde hazırlandıktan sonra kullanılmaları arasında geçen depolama süresi gibi birçok faktör etkilemektedir. Bu deneysel çalışmada, endüstriyel bir atığı temsilen Kütahya Espey bor zenginleştirme (konsantratör) tesisinin atık barajından doğal haliyle temin edilen atık önce kurutulmuş daha sonra atık barajındaki su/zemin oranı dikkate alınarak atık zemin süspansiyonu hazırlanmıştır. Hazırlanan atık zemin süspansiyonuna moleküler ağırlıkları farklı dört anyonik polimer belirli bir oranda karıştırılarak katı-sıvı ayrımında polimer performansını etkileyen faktörler belirlenmiştir. Elde edilen bulgulara göre, ideal karıştırma hızının 200-250 dev/dk, karıştırma süresinin 1-3 dakika, süspansiyonun çökelme süresinin 2-4 dk aralığında olduğu, polimer türüne göre süspansiyon sıcaklığının bulanıklık ve flokülasyonu etkileyebilecek bir faktör olduğu, polimer çözeltisi hazırlandıktan 24 saat sonra 7 gün süreyle etkinliğinde bir azalma olmadan kullanılabileceği belirlenmiştir.

Keywords

Anyonik Polimer, Endüstriyel Atık, Flokülasyon, Bulanıklık, Jar Deneyi

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