Study on treatment of chemical plant wastewater by using a integrated anaerobic–aerobic bioreactor

Figures & data

Figure 1. Schematic diagram of the IAAB process [21]: 1, feed tank; 2, peristaltic pump; 3, heater; 4, supernatant sampling port; 5, sludge sampling port; 6, gas collection; 7, reflux pump; 8, aeration pump; 9, effluent.

Table 1. Operation conditions of IAAB.

Run stage	Running time	Influent water (COD is 5000 mg/L)
	1–5 d	20% Chemical wastewater + 80% Glucose
	6–16 d	40% Chemical wastewater + 60% Glucose
	17–28 d	50% Chemical wastewater + 50% Glucose
Domestication	29–33 d	60% Chemical wastewater + 40% Glucose
	34–39 d	70% Chemical wastewater + 30% Glucose
	40–61 d	80% Chemical wastewater + 20% Glucose
	42– 68 d	90% Chemical wastewater + 10% Glucose
Stable operation	69–118 d	100% Chemical wastewater

Figure 2. The change of COD in anaerobic chamber during the domestication stage.

Figure 3. The change of pH during the domestication stage in each compartment.

Figure 4. The change of VFA during the domestication stage in each compartment.

Figure 5. The change of COD in aerobic chamber during the domestication stage.

Table 2. EPS content in sludge of anaerobic chamber.

Running time	Compartment	Protein (mg/g VSS)	Polysaccharide (mg/g VSS)	Protein/Polysaccharide	EPS (mg/g VSS)
1–10	1	2.42	1.33	1.82	3.75
	2	3.07	1.60	1.92	4.67
	3	3.64	1.95	1.87	5.59
11–20	1	2.30	1.25	1.84	3.55
	2	2.55	2.00	1.28	4.55
	3	3.35	2.80	1.20	6.15
21–30	1	2.86	1.80	1.59	4.66
	2	2.33	3.13	0.74	5.46
	3	3.20	3.80	0.84	7.00
31–40	1	0.55	2.53	0.22	3.08
	2	0.76	2.67	0.28	3.43
	3	1.08	2.65	0.41	3.73
41–50	1	0.61	2.73	0.22	3.34
	2	0.81	4.47	0.18	5.28
	3	1.25	4.50	0.28	5.75
51–60	1	1.06	4.93	0.22	5.99
	2	1.10	5.20	0.21	6.30
	3	1.75	5.25	0.33	7.00
61–70	1	1.13	4.27	0.26	5.40
	2	1.14	5.67	0.20	6.81
	3	1.67	4.85	0.34	6.52

Figure 6. The change of DHA in each compartment of anaerobic chamber.

Figure 7. The change of F₄₂₀ in each compartment of anaerobic chamber.

Figure 8. The change of COD during the stable operation.

Figure 9. The change of NH₃-N during the stable operation.

Figure 10. The change of SS during the stable operation.

Figure 11. The change of nitrobenzene during the stable operation.

Figure 12. The change of aniline during the stable operation.

Jin J, Wang Q, Yang L, et al. Pilot-scale integrated anaerobic–aerobic bioreactor for COD and NH3-N removal: start-up, key processes, and performance. Water Air Soil Pollut. 2023;234(8):530. doi: 10.1007/s11270-023-06545-9

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Data availability statement

Data will be made available on request.