No contract for garbage collection shall be awarded unless the county government shall publicly invite sealed bids by at least 14 days' notice in a newspaper published within the County. Bids so obtained shall be publicly opened and awarded to the lowest responsible bidder except that the county government may reject any or all bids. The county government may in its specifications include reasonable qualifications for bidders in respect to equipment. The county government may provide for contracts in excess of 1 year and may impose such provisions, conditions and limitations as deemed desirable, including requirements that no 1 bidder may serve the entire county.