| dc.description.abstract | Electroflocculation is a combination process of electroprepicitation and
electroflotation which is applied to treat waste water from pulp and paper
industry. Electroprecipitation and electroflotation processes occurred in the
reactor which was completed with electrodes simultaneously. In the
electroprecipitation, aluminum ions were released from anode that contacted
with electric current to become complex hydroxide aluminum which bound
organic composite contained lignin and dispersed colloid particles in waste
water pulp and paper and then coagulated to aglomerates. The
electroflotation process was signed bubbles of H2 gas from cathode due to
water electrolyzes. The floes were removed by the gas bubbles which were
generated during the process and floating to the surface. The result this
research showed that the optimum condition of contact time was 150 minutes
and electric current was 1,5 A in which the efficiency of COD decreasing was
75,14 %, Ca2
+ was 94,44 % and Mg2
+ was 98,21 %. On the other side, the
optimum condition of contact time was 180 minutes and electric current was
1,5 A in which the efficiency of color decreasing was 35,96 % and pH was
30,51 %. The result analysis showed that the calculated value of F was
greater than the value of F in the table (4,35), namely calculated value of F
for pH was 17,638, COD was 42,553, color was 5,070, Ca2
+ was 4,997, and
Mg2
+ was 26,275. These showed that contact time and electric current have
obviously and significantly effected the decrease of pH, COD, Color, Ca2
+
and Mg2
+. | en_US |
