In coagulation, Alum (Al2 (SO4)3.18H2O) was used as a coagulant
. Alum is one of the raw materials used by paper mill therefore its selection was preferred for treatment of wastewater.
Selection of alum and polyaluminum coagulants
: principles and applications.
The degree of the removal of manganese from water samples in which KMn[O.sub.4] was applied as the oxidising agent was constant and did not depend on the dose of the coagulant
. On the other hand, in the case of preceding the coagulation with aeration or oxidisation with hydrogen peroxide, the effectiveness of the removal of manganese was reduced together with an increase in the dose of the studied coagulants
These Textile industrial effluents subjected to different coagulation process (for various coagulants
in terms of process conditions, including coagulant
dose, pH and settling time), advanced oxidation process (Ozonation process, and Fenton processes alone and in combination to treat the effluent) and to determine the effects of process conditions such as Ozone (O3) dose, initial dye contents, iron catalyst concentration, H2O2 concentration, pH treatment time and settling time on the overall efficiency of these processes.
This line of specialty coagulants
is complementary to the Corp.'s specialty chemicals marketed under the name PWTTM and will significantly increase the level of recurrent sales.
Therefore, the point of this research is to evaluate the use of two coagulants
, poly aluminum chloride and ferric chloride, in turbidity removing and reducing organic matter from the raw water entering Ardebil's treatment system plant.
the higher primary turbidity, the higher efficiency of used coagulant
. The obtained results are in agreement to Aghili, who suggested the use of clay to increase turbidity and increase removal of organic matter by coagulants
The effect of coagulant
dosage, contact time and temperature on colour removal was studied by coagulation of T.
It is well known that the coagulants
could enhance primary treatment in municipal wastewater treatment plants, thereby reducing the cost of the secondary treatment stage.
PARAMETERS POME FROM POND pH 8.24 Temperature 30[degrees]C COD 5610 mg/l VSS 2840 mg/l Turbidity 2590 NTU TS 8580 mg/l TSS 4314 mg/l TDS 4266 mg/l Table 2: Coagulants
The coagulation process was carried out at different dosage of coagulants
, different water turbidities (low turbidity = 50 NTU; medium turbidity = 250 and high turbidity = 500 NTU) and different water pH (4.5 to 7.4).
All the alternative coagulants
performed better than alum and sodium aluminate in treating warmer raw waters of different quality throughout the fiscal year (polymer is not added to warmer waters).