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

Table 2 Microalgal biomass production in microalgae–effluent culture with and without indigenous bacteria

Effluent sample	Increase in microbial dry weight over 7 days (mg-dry weight/100 mL) and ratio of biomass of indicated species of microalga with bacteria to that without bacteria
Effluent sample	Chlamydomonas reinhardtii	Chlorella vulgaris	Euglena gracilis
MW1
With bacteria	42.0 ± 2.6	13.8 ± 3.4	24.4 ± 2.3
Without bacteria	27.7 ± 6.4	7.5 ± 0.6	11.8 ± 0.6
With bacteria/without bacteria ratio	1.5	1.8	2.1
MW2
With bacteria	29.1 ± 4.7	8.6 ± 0.5	12.8 ± 5.5
Without bacteria	18.7 ± 2.5	3.6 ± 1.7	3.7 ± 1.3
With bacteria/without bacteria ratio	1.6	2.4	3.5
SW
With bacteria	42.8 ± 2.1	47.1 ± 5.1	19.0 ± 3.6
Without bacteria	ND	16.8 ± 4.5	ND
With bacteria/without bacteria ratio	IC	2.8	IC

Values are means ± SDs (n = 3)
MW1 municipal wastewater effluent sample 1, MW2 municipal wastewater effluent sample 2, SW swine wastewater effluent, ND not detectable, IC incalculable

ISSN: 2731-3654