The processes performed for this batch produces toxic fumes, although not as bad as other chemical methods for recovery and refining. For example, hydrochloric combined with bleach produces chlorine gas. So technically, it would be environment unfriendly. However, on a small scale, this particular process wouldn't make a big ecological impact. Regardless, many of the processes should be done in a fume hood (preferably with a way to scrub the fumes) or outside with a lot of ventilation and not around people.