MATERIALS & METHODS
To determine the CaCl2
dosage for coagulation of
SDS, CaCl2
solution was added to SDS solution (10,000
mg/L) at concentrations of 0–819 mg/L. After mixing
for a few minutes, the coagulated SDS was removed
by filtration using a 0.45 µm membrane filter and the
chemical oxygen demand (COD) concentration of the
filtrate was measured. The SDS removal ratio was
determined using a COD equivalent of 2.0 (g/g) for
SDS. For determination of CaCl2
dosage for natural
rubber recovery, CaCl2
solution was added to 36,000
mgVS/L of natural rubber latex at concentrations of 0–
3,930 mg/L. After stirring for few minutes, the volatile
solid (VS) concentration was measured to determine
the coagulated rubber quantities.
The DPNR wastewater (Table 1) was collected
from a pilot-scale plant for protein removal at Nagaoka
University of Technology. An optimum dosage of CaCl2
for pre-treatment of DPNR wastewater was
experimentally determined by a coagulation study.
CaCl2
solution was added to the DPNR wastewater at
concentrations of 0–7,710 mg/L and mixed for 1 min.
After agitation, the samples were kept quiescent for 1
h. The SDS and VS concentrations of the supernatant
MATERIALS & METHODSTo determine the CaCl2 dosage for coagulation ofSDS, CaCl2 solution was added to SDS solution (10,000mg/L) at concentrations of 0–819 mg/L. After mixingfor a few minutes, the coagulated SDS was removedby filtration using a 0.45 µm membrane filter and thechemical oxygen demand (COD) concentration of thefiltrate was measured. The SDS removal ratio wasdetermined using a COD equivalent of 2.0 (g/g) forSDS. For determination of CaCl2 dosage for naturalrubber recovery, CaCl2 solution was added to 36,000mgVS/L of natural rubber latex at concentrations of 0–3,930 mg/L. After stirring for few minutes, the volatilesolid (VS) concentration was measured to determinethe coagulated rubber quantities.The DPNR wastewater (Table 1) was collectedfrom a pilot-scale plant for protein removal at NagaokaUniversity of Technology. An optimum dosage of CaCl2for pre-treatment of DPNR wastewater wasexperimentally determined by a coagulation study.CaCl2 solution was added to the DPNR wastewater atconcentrations of 0–7,710 mg/L and mixed for 1 min.After agitation, the samples were kept quiescent for 1h. The SDS and VS concentrations of the supernatant
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