Removal Characteristics of Organic Pollutants from Eutrophic Raw Water by Biological Pretreatment Reactors

Table 1

The removal rate of PAHs by cascade biofilm reactor (CSBR)/μg⋅L⁻¹.

Name	Rings	Raw water	CSBR-1	CSBR-2	CSBR-3
Naphthalene	2	1.084	1.396	1.597	1.395
Acenaphthene	3	1.746	0.907	1.415	0.870
Acenaphthylene	3	2.164	5.171	3.694	3.331
Fluorene	3	0.105	0.069	0.072	0.098
Phenanthrene	3	0.108	0.064	0.065	0.063
Anthracene	3	0.533	0.264	0.261	0.275
Fluoranthene	4	1.130	0.303	0.283	0.360
Pyrene	4	0.720	0.179	0.944	0.142
Benzo(a)anthracene	4	2.907	1.644	1.919	2.648
Chrysene	4	ND	ND	ND	ND
Benzo(b)fluoranthene	5	2.495	1.722	0.93	1.461
Benzo(k)fluoranthene	5	2.960	0.090	0.167	0.168
Benzo(a)pyrene	5	0.990	2.472	1.816	0.923
Indeno(1,2,3-cd)pyrene	6	3.082	1.028	1.486	1.793
Dibenzo(a,h)anthracene	5	1.314	0.146	0.033	0.148
Benzo(g,h,i)perylene	6	0.169	0.480	0.104	0.191
Total amount of PAHs (μg⋅L^−1)		21.507	15.935	14.786	13.866
Removal rate (%)			25.6	30.9	35.2

Note: PAHs: polycyclic aromatic hydrocarbons. ND means the substance was not detected.