Upon the completion of any such intercepting sewer, plant and works, and the appurtenances thereof, the commissioners shall retain and have the sole control and charge thereof, and every municipality using the same shall pay annually to the commissioners, on demand, its proportion of the cost of maintenance and operation thereof, as the same may be certified to it from time to time by the commissioners pursuant to the terms of said contract, which cost of maintenance and operation shall be raised and provided for by said municipalities by taxation, or by the issuance of temporary loan bonds in anticipation of taxation.