Growth promotion of three microalgae, Chlamydomonas reinhardtii, Chlorella vulgaris and Euglena gracilis, by in situ indigenous bacteria in wastewater effluent

Table 3 Quantification of bacterial 16S rRNA genes in initial effluent and 7-day cultures

Effluent sample	16S rRNA gene copy numbers (copies/mL), and their ratios in initial effluent and in 7-day cultures
	Initial	After cultivation with indicated microalgal species
	Initial	Chlamydomonas reinhardtii	Chlorella vulgaris	Euglena gracilis
MW1 effluent	4.2 ± 1.1 × 10⁸	9.2 ± 2.5 × 10¹⁰	6.2 ± 3.6 × 10¹⁰	7.4 ± 1.7 × 10¹⁰
7-day culture/initial ratio		219	148	176
MW2 effluent	2.2 ± 0.9 × 10⁸	7.2 ± 2.9 × 10¹⁰	4.7 ± 1.9 × 10¹⁰	2.4 ± 1.1 × 10¹⁰
7-day culture/initial ratio		327	214	109
SW effluent	8.7 ± 3.3 × 10⁹	6.9 ± 5.2 × 10¹²	6.5 ± 3.1 × 10¹²	2.9 ± 1.5 × 10¹²
7-day culture/initial ratio		793	747	333

Values are means ± SDs (n = 3)
MW1 municipal wastewater effluent sample 1, MW2 municipal wastewater effluent sample 2, SW swine wastewater effluent

ISSN: 2731-3654