ZLD STP WTP Unit ETPs India range lakes solids rivers Gujarat domestic chemicals factories raw water industries households pollutants groundwater coagulation agriculture consumption maintenance flow meters crucial role flocculation Installation contaminants water crisis liquid waste disinfection public health sedimentation water pollution various sources Turnkey Projects treatment plants primary treatment treatment process quality standards aquatic ecosystems tertiary treatment secondary treatment industrial RO plants biological processes industrial effluents industrial wastewater industrial discharges additional filtration Water Treatment Plant Allegiance Enterprise Sewage Treatment Plant environmental management Effluent Treatment Plant environmental protection environmental regulations other monitoring equipment Comprehensive O&M Services Allegiance Water Management Non-Telemetry Piezometer/DWLR Zero Liquid Discharge) plants ETP Other Service Providering Digital water level recorders