STUDY ON THE EFFECTS OF SOIL: CONCLUSIONS

CONCLUSIONS

The detailed remediation (degradation measured with net loss of TPH) studies during six months of experimentation show significant degradation of petroleum hydrocarbons at pH 4.5 and 7.5. In general soil responded most positively to pH increase from original pH to pH 7.5. The soil sample whose pH was adjusted to 3.5 showed less TPH degradation at all initial TPH concentrations which may be attributed to the decreased microbial activities at very low pH (pH3.5) as compared to original pH (pH5.0). Also, there was significant degradation of petroleum hydrocarbons with the addition of N-P-K fertilizer. The degradation continued to improve with increase in concentration of N-P-K fertilizer and available results indicate most positive result for 90% additional N-P-K fertilizer. The above observations strongly support that both the factors (that is soil pH and addition of N-P-K fertilizer) in combination enhance the total petroleum hydrocarbons degradation. This will, ultimately, help in preparing a suitable method for remediation of petroleum hydrocarbon contaminated soil.

ACKNOWLEDGEMENTS

Authors are highly thankful to DBT (Govt. of India) for funding the project entitled ÔÇťAssessment of oil field soil (with special reference to polyaromatic hydrocarbons) for their eventual remediation and reclamation. Authors are also thankful to all the members of the institutions, viz., IASST & Gauhati University for providing all the necessary helps to carry out the experiment.

Fig1Study on the Effects of-1
Figure 1: Total percentage loss in TPH for the samples with initial TPH 0.3% [A=0 day, B=30 days, C=60 days, D=90days, E= 120 days, F= 150 days, G=180 days]

Fig2Study on the Effects of-2
Figure 2: Total Percentage Loss in TPH for the Samples with Initial TPH 1.5% [A= 0 Day, B=30 Days, C=60 Days, D=90days, E= 120 Days, F= 150 Days, G= 180 Days]

Fig3Study on the Effects of-3
Figure 3: Total Percentage Loss In TPH for the Samples with Initial TPH 3.0% [A= 0 Day, B=30 Days, C=60 Days, D=90days, E= 120 Days, F= 150 Days, G= 180 Days]

Fig4Study on the Effects of-4
Figure 4: Total percentage loss in TPH for the samples with initial TPH 5.5% [A= 0 day, B=30 days, C=60 days, D=90days, E= 120 days, F= 150 days, G= 180 days]

Fig5Study on the Effects of-5
Table2Study on the Effects of-6
Table 2: A Summary of Sample Treatment and test Conditions Employed in the Effect of N-P-K Fertilizer on Remediation

table3Study on the Effects of-7
Table 3: Conc. of Residual TPH (%) [A= 0 Day, B=30 Days, C=60 Days, D=90days, E= 120 Days, F= 150 Days, G= 180 Days]

table4Study on the Effects of-8
table4Study on the Effects of-9
Table 4: Total Percentage Loss in TPH (%) [A= 0 day, B=30 days, C=60 days, D=90days, E= 120 days, F= 150 days, G= 180 days]

*Not Applicable

Table 5: Net Percentage Loss in TPH (%) Due to Treatment [A= 0 Day, B=30 Days, C=60 Days, D=90days, E= 120

Days, F= 150 Days, G= 180 Days]

table5Study on the Effects of-10
*Not Applicable
table6Study on the Effects of-11
Table 6: Conc. of Residual TPH (%) [A= 0 Day, B=30 Days, C=60 Days, D=90days, E= 120 Days, F= 150 Days, G= 180 Days]

table7Study on the Effects of-12
Table 7: Total Percentage Loss in TPH (%) [A= 0 Day, B=30 Days, C=60 Days, D=90days, E= 120 Days, F= 150 Days, G= 180 Days]

table8Study on the Effects of-13
*Not Applicable

Table 8: Net Percentage Loss In TPH (%) Due To Treatment [A= 0 Day, B=30 Days, C=60 Days, D=90days, E= 120

Days, F= 150 Days, G= 180 Days]

taBLE9Study on the Effects of-14
*Not Applicable
Figure 5: Total Percentage Loss in TPH for the Various Samples treated to Study the Effect of N-P-K Fertilizer. the Sample Nos. 1,2,3,4 and 5 Correspond to Samples with Code Nos. PFX1, PFX2, PFX3, PX18 And C02 Respectively [A= 0 Day, B=30 Days, C=60 Days, D=90days, E= 120 Days, F= 150 Days, G= 180 Days]

table9Study on the Effects of-15
Table 1: A Summary of Sample Treatment and Test Conditions Employed to Study the Effect of Ph on Remediation