No obligation may be incurred by the municipality in the construction or acquisition of the works contemplated by this subchapter or in the condemnation of property in connection therewith, except as shall be payable solely from the funds to be acquired from the sale of revenue bonds of the character authorized by this subchapter. In view of this provision, the court, in condemnation proceedings instituted under this subchapter by the municipality, may make such requirements of security as will serve to protect the landowner.