PhD on Vermifiltration

I am currently doing a PhD which aims to answer the following questions:

1. How does a full-scale vermifilter perform? (Case study: Soubeyran)
2. How does the effluent of full-scale vermifiltration installations compare to irrigation and fertigation standards?
   1. What is the removal of pathogens, heavy metals, and common house-hold micropollutants?
3. What are the mechanisms for nitrogen treatment and how do operational parameters affect these mechanisms (lab-scale)
4. How do full-scale vermifilters compare to lab-scale vermifilters?
   1. in terms of treatment efficiencies, greenhouse gas emissions, nitrogen cycle
5. Based on the collected knowledge, how can vermifiltration be optimized?