| See | 42 13 00 for industrial heat exchangers and recuperators. 44 61 00 for waste-to-energy equipment. 46 78 41 for recuperative air preheating equipment used for thermal processing of wastewater sludge. 46 78 46 for regenerative thermal oxidizers used for thermal processing of wastewater sludge. 46 78 47 for waste heat recovery boilers used for thermal processing of wastewater sludge. 46 78 49 for waste heat recovery heat exchangers used for thermal processing of wastewater sludge. |