The role of microalgae in effective instream agricultural wastewater treatment

Figures & data

Figure 1. The applied pilot.

Figure 2. Pilot unit detailed drawing.

DO: Dissolved Oxygen

CH: Channel.

Figure 3. Average DO concentrations along the two channels.

BOD: Biochemical Oxygen Demand

CH: Channel

Table 1. Average DO results and increasing ratios.

Distance m	CH1		CH2
	Concentration mg/l	R.R%	Concentration mg/l	R.R%
0	0.84	0	0.84	0
1.5	0.84	0	1.56	86
5	0.84	0	1.54	83
10	0.84	0	1.43	70

DO: Dissolved Oxygen.

CH: Channel.

R.R: Removal Ratio.

Figure 4. Average BOD concentrations along the two channels.

COD: Chemical Oxygen Demand

CH: Channel.

Table 2. Average BOD results and removal ratios.

Distance m	CH1		CH2
	Concentration mg/l	R.R%	Concentration mg/l	R.R%
0	486	0	486	0
1.5	486	0	346	29
5	486	0	296	39
10	486	0	266	45

BOD: Biochemical Oxygen Demand.

CH: Channel.

R.R: Removal Ratio.

Figure 5. Average COD concentrations along the two channels.

Table 3. Average COD results and removal ratios.

Distance m	CH1			CH2
	Concentration mg/l	R.R%	Concentration mg/l		R.R%
0	1193	0	1193		0
1.5	1193	0	633.3		46.9
5	1193	0	602		49.5
10	1193	0	580.8		51.3

COD: Chemical Oxygen Demand.

CH: Channel.

R.R: Removal Ratio.

TSS: Total Suspended Solids.

CH: Channel.

Figure 6. Average TSS concentrations along the two channels.

HM: Heavy Metals

CH: Channel.

Table 4. Average TSS results and removal ratios.

Distance m	CH1			CH2
	Concentration mg/l	R.R%		Concentration mg/l	R.R%
0	554		0	554	0
1.5	554		0	243	56.1
5	554		0	215	61.2
10	554		0	202	63.5

TSS: Total Suspended Solids.

CH: Channel.

R.R: Removal Ratio.

Figure 7. Average HM concentrations along the two channel.

Table 5. Average HM results and removal ratios.

Distance m	CH1		CH2
	Concentration mg/l	R.R%	Concentration mg/l	R.R%
0	1.27	0	1.27	0
1.5	1.27	0	0.88	31
5	1.27	0	0.38	70
10	1.27	0	0.28	78

HM: Heavy Metals.

C.H: Channel.

R.R: Removal Ratio.