NOVELTY - A device system to separate at inlet and treat polluted water inside river (101) and inside lake (105) comprises open and closed channels (104) for separate flow in river/lake with isolator connector sediment organic matter suction and concentrator, river flow based sediment concentration, compressed air generator powered from windmill directly driving air compressor pump, water drops driving turbine and human muscle power, biogas driven engine and electric power, plastic film used for chambers with leak detection electrodes with conducting grid, and chlorine dispenser near chamber wall.    USE - As device system for separating at inlet and treating polluted water inside river and inside lake (claimed).    ADVANTAGE - The separator channel for sewage canal ensures that no bad smell in emanated from the sewage system there by making a city cleaner, where the separator channel for sewage which is a continuous process digestor anaerobically fermenting sewage components during the course of flow out of the city and releasing methane as a rewenable energy source, effective rodent management is taken with multiple traps and by using biological control with non-poisonous snakes to prevent damage to films.    DETAILED DESCRIPTION - A device system to separate at inlet and treat polluted water inside a river (101) and inside a lake (105) by apportionment of river and lake for polluted water, using plastic film barrier based chambers for separation with the device comprising of sedimentation chamber, biogas digestor, filtration and microbial purifier chamber, chemical treatment and aeration chamber, azola and aquatic plant culture chamber, sludge decomposing chamber, toxic waste treatment chamber, open and closed channels (104) for separate flow in river and lake with isolator connector sediment organic matter suction and concentrator, river flow based sediment concentration, compressed air generator powered from windmill directly driving air compressor pump, water drops driving a turbine and human muscle power, biogas driven engine and electric power, plastic film used for above mentioned chambers with leak detection electrodes with conducting grid, fish repeller electrodes with pulsed power supply, chlorine dispenser near chamber wall for preventing damage from crabs, netting for protection from aquatic birds and reptiles. Microprocessors to detect leakage, sensors and bio chamber to monitor for toxic waste, leakage containment zone formed from suspended plastic film held by floats, floating platform with crane for deployment and retrieval of chambers, open and closed channels and river flow organic concentrators. INDEPENDENT CLAIMS are included for the following:    (1) use of compressed air for aeration in the aeration chamber, where air generated an exerciser person activated air pump that comprises of a step on cylinder with extended floor to enable easy stepping, the cylinder having a piston with shaft having a spring to return back the cylinder after foot is removed. The shaft being fixed in the hole made in the ground, a directional valve to allow compressed air to outlet pipe which sends it to a storage tank to build up pressure;    (2) separator channel in sewage canals, comprising of plastic film based closed channel having isolator Connector being made of rigid plastic material some of which has a impeller driven by one of motor fixed on Isolator connector coupled by belt drive, to move the sewage in the required direction, where the sewage channel is a continuous process digestor anaerobicaly fermenting sewage components during the course of flow out of the city and releasing methane collected by means of outlet pipes on top part of channel, where separator channel is provide with pipes for high pressure water for removing chokes where effective rodent management is taken with multiple traps and by using biological control with non poisonous snakes to prevent damage to films; and    (3) method of treatment as part of the system a tertiary treatment devise on land near a river and a lake where required to purify the water to drinking water standards, a membrane filter where air pressure from wind mill and water drop drive is used to filter through the water in renewable energy based manner to the extent possible, and Ion exchange process is utilized.    DESCRIPTION OF DRAWING(S) - The figure shows Top view of a river with separator being a closed type channel.    River (101)    Separator closed type channel (102)    U shaped connector (104)    Lake (105)