Related by context. Frequent words. (Click for all words.) 58 wastewater effluent 57 ultraviolet disinfection 56 Contaminated soil 56 evaporation ponds 55 sludges 54 shallow aquifer 54 sewage effluent 54 potassium permanganate 53 membrane bioreactor 53 de ionized 53 polluted groundwater 53 biosolid 52 polyethylene pipe 52 stormwater ponds 52 Reverse osmosis 52 stormwater discharge 52 settling ponds 52 frac fluid 51 toxic solvents 51 Aquifers 51 membrane filtration 51 dissolved solids 51 fracturing fluids 51 Sulfuric acid 51 hypochlorite 51 sodium hypochlorite 51 deionized water 50 aluminum sulfate 50 clearwell 50 chlorinator 50 SolarBee 50 wastewater 50 activated sludge 50 brine 50 MIOX 50 wastewater sludge 50 groundwater aquifers 50 methylene chloride 49 water 49 Water Reclamation Facility 49 radioactive sludge 49 Kuan Yin Taiwan 49 Zeolite 49 recharge groundwater 49 Bentonite 49 reclaimer 49 wastewater treatment 49 pervious concrete 49 drainfield 49 fly ash 49 wellfield 49 nanofiltration 48 mill tailings 48 discharging wastewater 48 clarifier 48 fracturing fluid 48 THMs 48 frac sand 48 sumps 48 ammonia nitrogen 48 Separators 48 chlorides 48 ultrapure water 48 flyash 48 chlorinated solvents 48 calcium sulfate 48 aquifer recharge 48 reverse osmosis RO 48 hydrofluoric acid 48 corrosive acid 48 Lake Lavon 48 disinfection byproducts 47 petroleum byproducts 47 sediment 47 stormwater retention 47 feedwater 47 groundwater 47 Kaskaskia River 47 treated effluent 47 contaminants 47 microfiltration 47 Hydrochloric acid 47 Anhydrous ammonia 47 corrosives 47 unnamed tributary 47 Rotenone 47 harmful contaminants 47 livestock manure 47 sludge 47 Hexavalent chromium 47 crushed limestone 47 potassium hydroxide 47 ammonium sulfate 47 Biosolids 47 dredged material 47 naturally occurring arsenic 47 brines 47 contaminating groundwater 46 mine tailings 46 contaminated soil 46 underground aquifer