The complete reductive dechlorination of chlorinated ethenes yields non-toxic ethene as a final product. Absent the right bacteria, you could see an accumulation of vinyl chloride. Although not necessary at every site, Tersus Environmental recommends the use of KB-1® family of bioaugmentation cultures.
KB-1® is a consortium of microbes that is extremely effective in completing the reduction of chlorinated ethenes to ethene. Bioaugmentation leads to faster bioremediation, which means more efficient use of electron donors and reduced O&M requirements, thereby lowering overall project costs. The KB-1® family of bioaugmentation cultures is the most widely used in the world for remediating chlorinated solvents. We would be happy to provide you with references at your request.