Hi Paritosh, regarding your second question ("on the use of hubcutter and waste disposal pit for the immunization waste disposal, including the advantages and disadvantages of the system"), the following guidance may be useful:
Planning and Implementing High-Quality Supplementary Immunization Activities for Injectable Vaccines (2016)
https://www.technet-21.org/en/resources/guidance/planning-and-implementing-high-quality-supplementary-immunization-activities-for-injectable-vaccines
There is a section on hub cutter use:

Training modules in health-care waste management > Module 17 - Management of specific infectious wastes
https://cdn.who.int/media/docs/default-source/wash-documents/wash-in-hcf/training-modules-in-health-care-waste-management/module-17---management-of-specific-infectious-waste.pdf
Contains a slide on the pros and cons of hub-cutters (AKA needle-cutters):

This cohort study in Ghana may also be of interest (conculsion: "The use of hub cutters did not increase the risk of NSIs. More training is needed to facilitate its implementation in mass campaign setting."):
Use of hub cutters and the volume of sharp waste and occurrence of needle-stick injuries during 2011 mass immunization campaigns against yellow fever in Ghana: a cohort study (2014)
https://www.technet-21.org/en/resources/journal-article/use-of-hub-cutters-and-the-volume-of-sharp-waste-and-occurrence-of-needle-stick-injuries-during-2011-mass-immunization-campaigns-against-yellow-fever-in-ghana-a-cohort-study
Hope this helps.