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SAI INTERNATIONAL SCHOOL
                                                        STD-VII

                                            SUBJECT - CHEMISTRY
                                TOPIC-MANAGEMENT OF WASTE WATER
                   SUB TOPIC-ALTERNATIVE METHOD OF SEWAGE DISPERSAL

                                                         MIND MAP









                                             ALTERNATIVE METHOD

                                             OF SEWAGE DISPERSAL





                     SEPTIC TANK         VERMICOMPOSTING            LANDFILL            INCINERATION















































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