Evaluation of Wastewater Reuse with Coagulation/Flocculation Process in Pesticide Production
Open Access
- 31 January 2019
- journal article
- Published by Dogal Afetler ve Cevre Dergisi in Doğal Afetler ve Çevre Dergisi
- Vol. 5 (1), 94-100
- https://doi.org/10.21324/dacd.433279
Abstract
Tr en Pestisit endüstrisi atıksularının toksik etkilere ve biyolojik birikime neden olması ve bu atıksuların yüksek kimyasal oksijen ihtiyacı (KOİ) ve askıda katı madde (AKM) konsantrasyonları çevresel açıdan önemli problemlere yol açmaktadır. Ayrıca, pestisit endüstrisinde üretilen pestisitlerin türüne ve kullanım özelliklerine göre atıksuların karakterizasyonu değişebilmektedir. Bu çalışmada yaygın ve ekonomik olarak kullanılan alum (Al2(SO4)3.18H2O), demir (II) sülfatın (FeSO4.7H2O) ve demir (III) klorür (FeCl3.6H2O) koagülantları ve anyonik polielektrolit (magnaflok) ile koagulasyon flokulasyon prosesi ile fizikokimyasal arıtabilirlik çalışması yapılarak atıksuyun üretimde yeniden kullanımı değerlendirilmiştir. AKM ve KOİ giderilmesinde koagülasyon – flokülasyon prosesinin giderim sağladığı ancak alıcı ortama deşarj için çok yeterli olmadığı görülmüştür. Demir (III) klorür, alum ve demir (II) sülfat için optimum pH değerleri sırasıyla 7,21, 8,12 ve 7,18 ve optimum koagülant dozajları demir (III) klorür ve demir (II) sülfat için 250 mg/L, alum için ise 300 mg/L olarak bulunmuştur. KOİ giderim verimleri demir (III) klorür, alum ve demir (II) sülfat için % 43, % 47 ve % 42, AKM giderim verimleri ise, demir (III) klorür için % 44, alum için % 47 ve demir (II) sülfat için % 39 bulunmuştur. Optimum polielektrolit dozları alum ve demir (II) sülfat için 0,2 mg/L, demir (III) klorür için ise, 0,3 mg/L olarak belirlenmiştir. Sonuç olarak bu koagulasyon-flokulasyon prosesi sonucunda elde edilen suyun geri kazanılarak üretimde kullanılabileceği belirlenmiştir. Pesticide industry wastewater causes toxic effects and bioaccumulation and high chemical oxygen demand (COD) and suspended solids (SS) concentrations of these wastewaters cause environmental problems. Furthermore, the wastewater caused from pesticide industry indicates great alteration in the wastewater characteristics subjected to the kind of agrochemicals produced and on the use of materials manipulated. In this study wide found and economical coagulants; ferrous (III) chloride, alum, ferrous (II) sulphate, and also a polyelectrolyte magnafloc were used for a physicochemical treatability study and reusing of the wastewater was evaluated. SS and COD removal was ensured with coagulation and flocculation process, however, it was seen that this process was not sufficient for discharging to receiving water environment. The optimum pH values for iron (III) chloride, alum and iron (II) sulphate were found to be 7.21, 8.12 and 7.18, respectively and optimum coagulant dosages were 250 mg/L for iron (III) chloride and iron (II) sulfate, and 300 mg/L for alum. The COD removal efficiencies were 43%, 47% and 42% for iron (III) chloride, alum and iron (II) sulphate respectively and also SS removal efficiencies were 44% for iron (III) chloride, 47% for alum, and iron (II) sulphate for 39%. Optimum polyelectrolyte doses were determined to be 0.2 mg/L for alum and iron (II) sulfate and 0.3 mg/L for iron (III) chloride. Consequently, it was ascertained that the wastewater originated from pesticide industry could be reused in production after the coagulation/ flocculation process.Keywords
This publication has 16 references indexed in Scilit:
- Pharmaceuticals and pesticides in reclaimed water: Efficiency assessment of a microfiltration–reverse osmosis (MF–RO) pilot plantJournal of Hazardous Materials, 2015
- Chemical coagulation-based processes for trace organic contaminant removal: Current state and future potentialJournal of Environmental Management, 2012
- Degradation of 32 emergent contaminants by UV and neutral photo-fenton in domestic wastewater effluent previously treated by activated sludgeWater Research, 2012
- Pilot-scale evaluation of ozone and biological activated carbon for trace organic contaminant mitigation and disinfectionWater Research, 2011
- Occurrence and fate of micropollutants in the Vidy Bay of Lake Geneva, Switzerland. Part II: Micropollutant removal between wastewater and raw drinking waterEnvironmental Toxicology and Chemistry, 2010
- To what extent are pesticides removed from surface water during coagulation–flocculation?Water and Environment Journal, 2008
- The effects of pH on phosphate removal from wastewater by electrocoagulation with iron plate electrodesJournal of Hazardous Materials, 2006
- Coagulation/flocculation process in the treatment of abattoir wastewaterDesalination, 2006
- Use of coagulants in treatment of olive oil wastewater model solutions by induced air flotationBioresource Technology, 2005
- Treatment of tannery wastewater by chemical coagulationDesalination, 2004