Tender For a operation and comprehensive maintenance of 150 kld stp capacity sewage treatment plant at nisa cisf hakimpet hyderabad b operation and comprehensive maintenance of fsti cisf campus, hakimpet hyderabad c operation and comprehensive maintenance of 150 kld capacity aerated wetlands based sewerage treatment plant at nisa, cisf hakimpet hyderabad sub head removal of sludge silt dirt sand garbage and other waste from the sewage collection tankssubwork/packages:removal of sludge silt dirt sand garbage and other waste from the sewage collection tanks