Parameswaran Iyer, who had spearheaded the implementation of the flagship $20 billion Swachh Bharat Mission, on Monday took charge as the CEO of Niti Aayog, according to PTI report. He replaced Amitabh Kant, who demitted office on June 30. A 1981-batch IAS officer of Uttar Pradesh cadre, Iyer has worked with both the public and…