Biogas potential and methanogenic community shift in in-situ anaerobic sewage sludge digestion with food waste leachate additions

Applied Biological Chemistry

Table 3 Impact on environmental loading of dewatered wastewater on nearby sewage treatment plants

Facility	SD	CD1	CD2	CD3	Avg	Min	Max
Capacity of sewage disposal plant (1000 m³/d)	340	1630	680	250	725	250	1630
Design concentration of input sewage (mg/L)
BOD	125	174	180	160	160	125	180
COD	110	94	160	150	129	94	160
SS	147	133	180	180	160	133	180
TN	38	37	40	50	41	37	50
TP	5	4	5	6	5	4	6
Design influent loading rate of input sewage (kg/d) (A)
BOD	42,500	283,620	122,400	40,000	122,130	40,000	283,620
COD	37,400	153,220	108,800	37,500	84,230	37,400	153,220
SS	49,980	216,790	122,400	45,000	108,543	45,000	216,790
TN	12,920	60,310	27,200	12,500	28,233	12,500	60,310
TP	1700	6846	3400	1375	3330	1375	6846
Recycle water flux after anaerobic digestion (m³/d)	900	4600	1742	600	1961	600	4600
Mixing ratio of food waste (leachate) in organic materials (%)	–	4	26	63	31	4	63
Concentration of recycle water (mg/L)
BOD	322	307	1129	1450	802	307	1450
COD	262	226	523	1205	554	226	1205
SS	373	386	1250	1750	940	373	1750
TN	895	408	1056	2012	1093	408	2012
TP	85	93	52	102	83	52	102
Influent loading rate of recycle water (kg/d) (B)
BOD	290	1410	1967	870	1134	290	1967
COD	236	1037	911	723	727	236	1037
SS	336	1776	2178	1050	1335	336	2178
TN	806	1878	1840	1207	1433	806	1878
TP	77	428	91	61	164	61	428
Percentage of recycle water to influent loading rate (B/A)*100(%)
BOD	0.7	0.5	1.6	2.2	1.3	0.5	2.2
COD	0.6	0.7	0.8	1.9	1.0	0.6	1.9
SS	0.7	0.8	1.8	2.3	1.4	0.7	2.3
TN	6.2	3.1	6.8	9.7	6.5	3.1	9.7
TP	4.5	6.2	2.7	4.5	4.5	2.7	6.2