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Table 1

Main characteristics of the coal gasification wastewater

IndicesCoal gasification wastewaterEffluent of coagulation
pH 8.5–9.0 8.5–9.5 
COD (mg/L) 16,000 ± 1,000 6,000 ± 500 
TN (mg/L) 4,000 ± 1,000 2,100 ± 150 
Total phenols (mg/L) 2,500 ± 300 250 ± 40 
Ammonia (mg/L) 1,500 ± 100 1,500 ± 100 
Oil content (mg/L) 1,000 ± 100 90 ± 10 
IndicesCoal gasification wastewaterEffluent of coagulation
pH 8.5–9.0 8.5–9.5 
COD (mg/L) 16,000 ± 1,000 6,000 ± 500 
TN (mg/L) 4,000 ± 1,000 2,100 ± 150 
Total phenols (mg/L) 2,500 ± 300 250 ± 40 
Ammonia (mg/L) 1,500 ± 100 1,500 ± 100 
Oil content (mg/L) 1,000 ± 100 90 ± 10 

Note: The effluent of coagulation is the raw wastewater for this study.

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