Abstract:
The produced water (PW) is wastewater generated from the extraction of oil and gas
production. The PW from Minas oilfiledis around 13.5 million m3 per day and contains
metals thatare boron (B) = 7,46±0,13 mg/L as B3+and barium (Ba) = 1,43±0,11 mg/Las
Ba2+. Both metal contents are over the quality standards according to PP. No. 82 in
2001 (max. 1,00 mg/L). PW is a potential source to supply the water needs of the
society in Minas District. So that PW can be utilized, it needs an effective treatment
method to reduce of B and Ba contents by adsorption. The natural adsorbents are used
to adsorb and more available in nature are rice husk (RH), commercial charcoal (CC)
and bentonite clay (BC). The present study was aimed at the reduction of B and Bain
Minas oilfield PW using RH, CC, and BC as adsorbents via batch process. Variable
applied were adsorbent dosage (1, 5, 10, and 20%w/v) and cantact time (3, 12, 24,
and 48 hours). The optimum result was exhibited by adsorption process using CC with
dosage = 20%w/v and detention time of 3 hours which reduced B up to 96,2% and Ba
= 99,3%. Through this process, the PW after treatment containedB = 0,28±0,02 mg/L as
B3+and Ba = 0,01±0,01 mg/L as Ba2+. According to PP. No. 82 in 2001, the B and Ba in
the PW after adsorption process is lower than 1,00 mg/L (Class I). It is concluded the
PW after adsorption treatment can be used as raw material for drinking water and
other usages.
