| 121 | Chemical piping during dredging and cleaning of Daegu food processing facility | Techcross Environmental Service | Daegu city | 2021.02 |
| 122 | Mechanical installation work during structural construction (other existing facility improvement work) | Techcross Environmental Service | Daegu food waste treatment plant | 2021.02 |
| 123 | Gunsan Industrial Complex 2 wastewater site separation membrane (B series) cleaning | Daehyun E&S | Gunsan Wastewater Treatment Plant | 2021. 03 |
| 124 | Post-treatment bag filter replacement work and duct chamber cleaning | Iljin Steel Co., Ltd. | Iljin Steel Co., Ltd. | 2021.03 |
| 125 | Centrifugal dust collector installation work (500㎥/min) | DS Timber Co., Ltd. | DS Timber Co., Ltd. | 2021.03 |
| 126 | Centrifugal force dust collector installation work (300㎥/min) | Taesung Wood Co., Ltd. | Taesung Wood Co., Ltd. | 2021.03 |
| 127 | Centrifugal dust collector installation work (250㎥/min) | Haesung Timber Co., Ltd. | Haesung Timber Co., Ltd. | 2021.03 |
| 128 | Centrifugal dust collector installation work (250㎥/min) | Baeksan Wood | Baeksan Wood | 2021.03 |
| 129 | Centrifugal force dust collection equipment installation work (250㎥/min) | Taejin Wood Co., Ltd. | Taejin Wood Co., Ltd. | 2021.04 |
| 130 | Centrifugal force dust collection equipment installation work (180㎥/min) | Good wood | Good wood | 2021.04 |
| 131 | Cleaning dust collection facility installation work (250㎥/min) | Sungjin Polymer Co., Ltd. | Sungjin Polymer Co., Ltd. | 2021.04 |
| 132 | Filtration dust collection facility installation work (150㎥/min) | GS Metal | GS Metal | 2021.04 |
| 133 | Ultramembrane cleaning work | Gunsan Wastewater Terminal Treatment Plant | Gunsan Wastewater Terminal Treatment Plant | 2021.05 |
| 134 | Filtration dust collection facility installation work (300㎥/min) | Daishin Renewable Industry | Daishin Renewable Industry | 2021.05 |
| 135 | Centrifugal force dust collection facility installation work (200㎥/min) | Seung Oud | Seung Oud | 2021.05 |
| 136 | Filtration dust collection facility installation work (400㎥/min) | Gunjang recycling cycle | Gunjang recycling cycle | 2021.05 |
| 137 | Painting booth and adsorption tower installation work (400㎥/min) | Wooseok Engineering (Tata Daewoo primary vendor) | Wooseok Engineering | 2021.06 |
| 138 | Digestion tank transfer pipe repair work | Gunsan Sewage Treatment Plant | Gunsan Sewage Treatment Plant | 2021.06 |
| 139 | Wastewater discharge facility reporting rental service | Dongwoo Farm to Table Co., Ltd. | Dongwoo Farm to Table Co., Ltd. | 2021.06 |
| 140 | Glass shop wastewater treatment equipment | Gwangyeoldang | Gwangyeoldang | 2021.06 |
| 141 | Glass shop wastewater treatment equipment | Seawell Optician | Seawell Optician | 2021.06 |
| 142 | Delivery and installation of filters, dehydrators, chemical pumps, etc. | Farmers Food Co., Ltd. | Farmers Food Co., Ltd. | 2021.07 |
| 143 | Production and installation of local ventilation facilities for the grinding process | Sangwon IML Co., Ltd. | Sangwon IML Co., Ltd. | 2021.07 |
| 144 | Expanded separation membrane pretreatment equipment screw canvas air reduction shaft repair and piping improvement repair | Environmental Facility Management Co., Ltd. | Environmental Facility Management Co., Ltd. | 2021.07 |
| 145 | Pen Balancing and Bearing Replacement | Korea TV Co., Ltd. | Korea TV Co., Ltd. | 2021.07 |
| 146 | Digester B series concentrated sludge supply pipe replacement | Techcross Environmental Service Co., Ltd. | Techcross Environmental Service Co., Ltd. | 2021.08 |
| 147 | Post-treatment duct chamber cleaning and duct installation work | Iljin Steel Co., Ltd. | Iljin Steel Co., Ltd. | 2021.08 |
| 148 | Wastewater treatment plant repair work | Dio Electronics Co., Ltd. | Dio Electronics Co., Ltd. | 2021.08 |
| 149 | Environmental approval and permit rental services, etc. | Daeseung Industrial Co., Ltd. | Daeseung Industrial Co., Ltd. | 2021.08 |
| 150 | Wastewater treatment plant installation work (150 tons/day) | Daewoo Engineering & Construction | Iljuk Sewage Treatment Plant | 2021.09 |
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