Related by context. Frequent words. (Click for all words.) 58 sewage effluent 58 wastewater effluent 58 evaporation ponds 57 sludges 57 salination 56 silts 56 shallow aquifer 56 Soil erosion 56 THMs 56 groundwater aquifers 56 andesitic 56 settling ponds 55 bioaccumulation 55 Hydrogen sulfide 55 stormwater ponds 55 feedwater 55 filtrate 55 sulfide minerals 55 embayment 55 gully erosion 55 carbon tetrachloride 55 leaching 55 nitrification 55 sediment 55 Turbidity 54 sedimentation 54 tailings dams 54 sulphates 54 rotting vegetation 54 tailing ponds 54 soil salinity 54 clarifiers 54 potassium permanganate 54 acidic soils 54 iron oxides 53 Kuan Yin Taiwan 53 riparian vegetation 53 carbonic acid 53 dewatering 53 siltation 53 dewatered 53 xylem 53 wellfields 53 polluted groundwater 53 Sulfur dioxide 52 tailings 52 iron manganese 52 aromatic hydrocarbons 52 turbidity 52 tailings disposal 52 surficial 52 groundwater extraction 52 sulfide 52 alkali 52 treated effluent 52 Stormwater runoff 52 chlorides 52 hydrologic cycle 52 DBPs 52 chlorinated solvents 52 hydroxyl radicals 52 Algae blooms 52 hydroxide 52 contaminating groundwater 51 salinity 51 effluent 51 denitrification 51 Rotenone 51 riparian zones 51 wastewaters 51 sulfides 51 kaolinite 51 dissolved solids 51 leachate 51 atmospheric nitrogen 51 dissolved oxygen levels 51 groundwater 51 vuggy silica 51 PCBs polychlorinated biphenyls 51 demineralization 51 ultraviolet disinfection 51 corrosives 51 nutrient loading 51 triclocarban 51 biota 51 drainfield 51 channelization 51 soils 51 Acidic 51 contaminants 51 chloride 51 biogeochemical 51 aquifer recharge 50 oxidising 50 Sediments 50 Sulfuric acid 50 calcrete 50 watercourse 50 inorganic compounds 50 slurry 50 saturated soils