The Optimized Use Of Poly Alumunium Chloride And Aquaklir In The Process Of Coagulation And Floculation In The Processing Of Mining Wastewater In PT Cibaliung Sumberdaya, Pandeglang Regency, Banten Province

Abstract

PT Cibaliung Sumberdaya was known as the underground gold mine which
applied the cut and fill type of mining method. The mining activities were conducted
in two locations, Cikoneng and Cibitung. Based on mine dewatering data in 2015,
the average of groundwater discharge aimed to Cibitung was 101.295.360 lt/month
and to Cikoneng was 4.704.325,714 lt/month. The water discharged was considered
as mining wastewater due to its containing of very subtle mud particles with pH >8.5
and TSS >200 mg/L classified as high level.
Thus, PT Cibaliung Sumberdaya conducted the wastewater processing by
using coagulation method which included the use of PAC, floculation with aquaklir,
and HCl 1% neutralization. The coagulation method had not reached its maximum
result because the high use of PAC reagent and aquaklir. The result showed that
more studies about the optimized use of PAC and aquaklir in each location of
wastewater processing were needed so the process could be more effective and
efficient.
The result of the research depicted that the optimal concentration of PAC
and aquaklir for wastewater processing in Cikoneng was possible to be optimized to
235 ppm and 5 ppm with the average of wastewater volume per month around
5.262.024,214 lt/month. Meanwhile, in Cibitung, the optimized use could be up to 14
ppm and 1 ppm with the average of wastewater volume around 101.853.058,5
lt/month.
Accordingly, the PAC and Aquaklir needed for wastewater processing in Cikoneng
was 1.23,576 kg/month and 26,310 kg/month valued Rp.8.804.419 And Rp.
1.331.201. As in Cibitung, the PAC and Auaklir needed for wastewater processing
was 1.425,943 kg/month and 101.853 kg/month valued Rp. 10.152.713 and Rp.
5.153.407.