Wastes to Reduce Emissions from Automotive Diesel Engines

Table 1

Main effects of diesel exhaust on the pH, EC, PO₄, K, CO₂ and NH₄ (average values for 14 measurements).

Treatment	pH	EC; (dS/m)	PO4; (mg/L)	K; (g/L)	CO2; (g/L)	NH4; (g/L)	CO2-Absorption; (g/L)	NH4 Reduction; (g/L)	Absorption coefficient
A	8.89^b	27.9^a	139^a	1.7^a	4.5^a	5.2^a
A1	8.36^a	28.9^b	164^a	1.7^a	8.5^b	4.8^a	+4.06^b	−0.42^c	0.87^cd
B	8.89^b	22.1^a	138^a	1.3^a	4.2^a	4.0^a
BP	8.81^b	24.5^b	135^a	1.3^a	5.5^b	4.5^b
BP1	8.17^a	25.1^b	144^a	1.3^a	8.2^c	4.0^a	+2.63^a	−0.47^c	0.66^bc
C	8.97^b	42.2^b	178^a	3.3^a	10.5^a	8.5^b
CS	8.94^b	43.3^c	196^b	3.3^a	10.8^a	8.8^b
CS1	8.37^a	39.1^a	196^b	3.5^a	12.2^b	6.1^a	+1.67^a	−2.75^a	0.29^a
DO	8.95^b	39.0^b	174^a	3.0^a	5.3^a	7.6^b
DO1	8.36^a	36.8^a	174^a	3.1^a	10.9^b	5.9^a	+5.62^c	−1.72^b	0.98^d
E	8.95^c	26.7^a	159^b	1.4^a	5.1^a	5.3^b
EPO	8.81^b	29.5^c	131^a	1.8^b	6.7^b	5.6^b
EPO1	8.22^a	28.8^b	152^b	1.9^b	8.4^c	4.4^a	+1.75^a	−1.25^b	0.42^ab

Different letters^{(a, b, c, d)} within a column indicate significant differences between treatments at level of significance (𝑃<0.05) according to Tukey's test.