Panitta Hirayaporn. Color and total suspended solid removal from textile wastewater using alum sludge with natural polymer from Tamarind-kernel or Litchi-kernel by coagulation and flocculation . Master's Degree(Appropriate Technology for Resources and Environmental Development). Mahidol University. : Mahidol University, 2007.
Color and total suspended solid removal from textile wastewater using alum sludge with natural polymer from Tamarind-kernel or Litchi-kernel by coagulation and flocculation
Abstract:
The research objective was to study and compare color removal efficiency from textile
wastewater using chemical coagulation-flocculation by the jar test method which used alum
sludge treated with acid, alum sludge treated with acid with tamarind-kernel powder
suspension and alum sludge treated with acid with litchi-kernel powder suspension
(polyelectrolyte). The experiment used synthetic wastewater that was synthesized from mixed
textile wastewater. (the dyes were: Dystar Indigo Gvan; Sulphur Black BR 200; Direct
Kayarus Blue BRL 200 and Reactive Cibacorn Blue CR) The experiment was divided into two
parts. In the first part, the pH was studied to ascertain the level at which color and Total
Suspended Solid (TSS) residues could be most efficiently coagulated using alum sludge treated
with acid only. In the second part, removal efficiency was studied by using alum sludge
treated with acid with tamarind-kernel powder suspension and alum sludge treated with acid
with litchi-kernel powder suspension to coagulate color and TSS residues.
With regard to the first part, residues from synthetic wastewater were most efficiently
coagulated at pH 7.0. Color and TSS were reduced by 21.68% and 25.09% respectively.
Residues from synthetic wastewater were most efficiently coagulated at 300 mg. Color and
TSS were reduced by 87.85% and 86.96% respectively.
The optimum conditions for increased color and TSS removal efficiency were when
using alum sludge treated with acid with tamarind-kernel powder suspension of > 5 mg/L and
litchi-kernel powder suspension of > 3 mg/L. Optimum concentrations of tamarind-kernel
powder suspension and litchi-kernel powder suspension for color and TSS removal were 11
mg and 7 mg respectively. The best color and TSS removal efficiency of tamarind-kernel
powder suspension and litchi-kernel powder suspension were 87.88% and 96.74%, 100% and
100% respectively. But the Chemical Oxygen Demand (COD) value was increased.