Effect of pH on Separation of Solid Content from Paint Contained Wastewater by a Coagulant-flocculant Compound

محورهای موضوعی :

Mojtaba Semnani Rahbar ¹ ()
Eskandar Alipour ² ()
Reza Eskandari Sedighi ³ ()
Safoora Sajad ⁴ ()
Marzieh mohamadiani ⁵ ()

تاریخ دریافت : 1393/01/31 تاریخ پذیرش : 1397/08/07 تاریخ انتشار : 1397/08/07

کلید واژه: separation, Coagulant, Flocculent, Paint, Jar test, Solid content,

چکیده مقاله :

Chemical wastewater treatment is one of the attracting and common methods for wastewater treatment among the currently employed chemical unit processes. The use of coagulant-flocculant compound is one of the efficient methods for separating of paint and recovery of water. In this research, it was introduced and the effect of pH on removal of solid content from solution was studied experimentally. For this purpose, sludge and suspended solid content of the solution were determined in a jar test by measurement of UV absorption of treated solution and solid separation percentage. The results showed that in pH range 9.5-10.5, maximum efficiency of solid content removal was up to 95%. Consequently, maximum paint removal was obtained in this range of pH. The separation of solid content of the solution was due to formation of aluminum hydroxide. As shown by the results, the reduction of potassium hydroxide as pH adjuster caused decrease of pH and consequently decreases of aluminum hydroxide and solid content removal.  

منابع و مأخذ:

1. Steel W. F., McGhee, J. T., 1979. Water Supply and Sewerage, 5th Ed., McGraw Hill, New York.
2. Duan J., Gregory J., 2003. Coagulation by Hydrolyzing Metal Salts, Advanced Colloid and Interface Science, 100, 475-502.
3. Ives K. Y., 1974. Solid-Liquid separation,Effluent Water Treatment Journal, 14, 636-637.
4. Cordelair J., Greil P., 2004. Flocculation and Coagulation Kinetics of Al2O3 Suspensions,Journal of European Ceramic Society, 24, 2717-2722.
5. Duan J., wang J., Graham U., Wilson F., 2002. Coagulation & Humic Acid by Aluminum Sulphate in Saline Wastewater Conditions,Desalination, 150, 1-14.
6. Delgado S., Diaz F., Garcia D., Oterto N., 2003. Behavior of Inorganic Coagulants in Secondary Effluents from Conventional Wastewater Treatment Plant,Separation & Filtration, 40, 43-46.
7. Bache H. D., Papavasilopoulos N. E., 2003. Dewatering of Alumino-HumicSludge: Impacts of Hydroxide,Water Research, 37, 3289-3298.
8. RahbarS. M., Alipour E., Sedighi R. E., 2006. Color removal from industrial wastewater with a novel coagulant-flocculant formulation,International Journal of Environmental Science and Technology, 3(1), 79-88.
9. Yang L. Z., Liu X., Gao B., Zhao S., Wang Y., Qinyan Yue, Li Q., 2013.Flocculation kinetics and floc characteristics of dye wastewater by polyferric chloride-poly epichlorohydrin-dimethylamine Composite flocculant,Separation and Purification Technology, 118, 583-590.
10. Li Z. J., Yuan Y. X., Tian M., Ji R. H., Jiang W., 2013.Decolorization of reactive brilliant red X-3B.
11. simulateddye water by novel coagulants,Material science Forum, 743-744, 665-668.
12. Verma K. A., Dash R. R., Bhunia P., 2012.A review on chemical coagulation/flocculation technologies for removal of colour from textile wastewaters,Journal of Environmental Management, 93(1), 154-168.
13. Rodrigues D. S. C., Madeira M. L., Boaventura R. A. R., 2013.Treatment oftextile dye wastewaters using ferrous sulphate in achemical coagulation / flocculationprocess. Environmental Technology, 34(6), 719-729.
14. Irfan M., Butt T., Imtiaz N., Abbas N., Khan A. R., Shafique A., 2013.The removal of COD, TSS and color of black liquor by coagulationââ‚‌“flocculation process at optimized pH, settling and dosing rate,Arabian Journal of Chemistry, [Online]2013.http://dx.doi.org/10.1016/j.arabjc.2013.08.007(Accepted 13 Aug. 2013)
15. Rahbar S. M., Alipour E. Sedighi R. E., 2006. Effect of poly aluminum chloride and ploy acryl amid on separation of color from waste water by novel coagulant-flocculant composition, Journal of Polymer Science and Technology, 19(2), 111-119.
16. PPG Automotive Pretreatment Manual, Coagulation Systems Technical Information, PPG Industries Italia, Italy, 2002.
17. BASF Technical Information, Especially Chemicals for Water Treatment, BASF Aktienjesellschaft, Germany, 2002.