Only authorized collectors acting under the authority of or licensed by the Town of Boston shall collect, pick up or remove or cause to be collected, picked up or removed any municipal solid waste, recyclable materials so placed for collection; each such unauthorized collection, pickup or removal shall constitute a separate violation of this chapter; provided, however, that where the authorized collector has refused to collect certain recyclable materials because they have not been separated, placed or treated in accordance with the provisions of this chapter, the person responsible for initially placing those materials for collection may and shall remove these materials from any curb, sidewalk or street side. Nothing herein shall prevent any person from making arrangements for the private collection, sale or donation of recyclable materials prior to placement at curbside.