Impact Evaluation of Wastewater Treatment Based on the Anaerobic Digestion of Sewage Sludge Using the Life Cycle Assessment Method

Table 3

Effect class weighting of South Tehran’ treatment plant system using the ReCiPe 2016-midpoint method.

Effect class	Indicator
	Tot.	PWW	PF	Amm	NF	CP grid	CP CHP	Cl
1	0.105878	0.227568	2.01E − 09	2.97E − 09	1.68E − 08	0.040717	−0.16287	0.000462
2	3.16E − 05	3.16E − 05	4.06E − 14	1.30E − 13	3.39E − 13	1.25E − 15	−5.01E − 15	2.44E − 10
3	0.000317	0	1.60E − 10	1.79E − 10	1.34E − 09	0	0	0.000317
4	−0.00032	0	5.16E − 12	8.05E − 12	4.30E − 11	0.000108	−0.00043	1.33E − 08
5	0.000426	0.000681	7.77E − 12	5.67E − 12	6.48E − 11	8.52E − 05	−0.00034	9.05E − 07
6	−0.00032	0	5.31E − 12	8.17E − 12	4.43E − 11	0.000108	−0.00043	2.14E − 08
7	0.004646	0.005518	4.12E − 11	1.64E − 11	3.43E − 10	0.000292	−0.00117	2.89E − 06
8	0.00067	0.00067	8.09E − 13	6.75E − 13	6.75E − 12	3.09E − 10	−1.24E − 09	4.40E − 10
9	−4.61E − 09	0	5.51E − 12	1.40E − 13	4.60E − 11	2.10E − 09	−8.41E − 09	1.64E − 09
10	0.000264	7.61E − 17	4.10E − 09	1.85E − 08	3.42E − 08	8.71E − 07	−3.49E − 06	0.000266
11	0.01196	0.01196	4.19E − 11	9.66E − 11	3.50E − 10	3.53E − 10	−1.41E − 09	6.71E − 08
12	101.1531	101.1523	3.08E − 07	1.18E − 06	2.57E − 06	7.52E − 06	−3.01E − 05	0.000798
13	0.001767	0.001766	3.82E − 09	4.98E − 09	3.18E − 08	1.42E − 09	−5.69E − 09	8.18E − 07
14	84.52448	84.52386	2.50E − 07	9.67E − 07	2.08E − 06	6.87E − 06	−2.75E − 05	0.000633
15	2.49E − 08	0	2.66E − 09	3.70E − 11	2.22E − 08	0	0	0
16	−3.23E − 07	0	5.07E − 12	1.99E − 11	4.23E − 11	1.14E − 07	−4.55E − 07	1.78E − 08
17	−0.03865	0	3.62E − 10	9.91E − 10	3.02E − 09	0.012914	−0.05166	8.88E − 05
18	−1.55E − 05	0	3.03E − 10	6.06E − 11	2.53E − 09	6.03E − 06	−2.41E − 05	2.58E − 06

(1) global warming (kg CO2 eq), (2) depletion of the stratospheric ozone layer (kg CFC11 eq), (3) ionizing radiation (kBq Co-60 eq), (4) ozone formation, human health (kg NOx eq), (5) formation of fine particles (kg PM2.5 eq), (6) ozone formation, terrestrial ecosystems (kg NOx eq), (7) acidification of the earth (kg SO2 eq), (8) freshwater eutrophication (kg P eq), (9) marine eutrophication (kg N eq), (10) terrestrial environmental toxicity (kg 1,4-DCB), (11) environmental toxicity of fresh water (kg 1,4-DCB), (12) marine environmental toxicity (kg 1,4-DCB), (13) carcinogenic toxicity in humans (kg 1,4-DCB), (14) noncarcinogenic toxicity in humans (kg 1,4-DCB), (15) land use (m2a crop eq), (16) lack of mineral resources (kg Cu eq), (17) lack of fossil resources (kg oil eq), (18) water consumption (m3). Tot, total; PWW, purified wastewater; PF, phosphorus fertilizer; Amm, ammonia; NF, nitrogen fertilizer; CP grid, consumed power (grid); CP CHP, consumed power (CHP); Cl, chlorine.