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EC number: 287-476-5
CAS number: 85535-84-8
Table 1: Effect of chlorinated paraffin on
anaerobic digester gas production
Concentration of chlorinated paraffin % (w/w) on volatile solids
% Inhibition of gas production (daily values)
10 (10, 000 mg/L)
5.6 (56,000 mg/L)
3.2 (32,000 mg/L)
1.8 (18,000 mg/L)
1.0 (10, 000 mg/L)
0.56 (5,600 mg/L)
Table 2: Concentration of chlorinated
paraffin causing inhibition at various time intervals
% Chlorinated paraffin (w/w) on volatile solids
In a well conducted GLP study, the toxicity
of Chlorowax 500C (a C10-12 chlorinated paraffin; 58% chlorination) to
the anaerobic sewage sludge digestion process was investigated. Toxic
effects, after treatment of a mixture of feed and digested sludges with
concentrations of 0.56, 1.0, 1.8, 3.2, 5.6 and 10% chlorinated paraffin
w/w with respect to digester volatile suspended solids content, were
assessed by the measurement of the degree of inhibition of gas
production at various time intervals of up to 10 days. According to the
EU RAR, the test concentrations equate to 5600, 10,000, 18,000, 32,000,
56,000 and 100,000 mg/L respectively.
Significant inhibition of gas production
occurred at concentrations of 32,000 mg/L and above during the first 3-4
days of treatment. Recovery was seen after this time, which continued up
to day 10. No significant effects were noted at 18,000 mg/L and below.
This study showed that short term exposure to Chlorowax 500C
concentrations of 32, 000 mg/L and above may cause transient partial
inhibition of gas production. However, recovery of affected digesters is
likely to be rapid with no long-term effects.
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