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4. The initial phase of sewage treatment, involving the mechanical removal of large debris and particulate matter
8. The controlled application of oxidizing agents, such as chlorine or ozone, to neutralize pathogens and microorganisms in sewage effluent
9. The regulated management and disposal of residual sewage sludge following treatment, aimed at mitigating environmental impacts
11. The terminal phase of sewage treatment, encompassing advanced oxidation processes aimed at pathogen eradication and effluent disinfection.
12. An instrument utilized to gauge the volumetric flow rate of fluids within sewage conduits, critical for system monitoring
14. An aerobic treatment process reliant on microbial respiration to degrade organic pollutants and enhance effluent clarity

1. A subterranean access structure integral to sewage network infrastructure, facilitating routine maintenance and inspection
2. A fossil fuel commonly employed in cogeneration systems, known for its calorific value and low emissions profile
3. A subsurface conduit network characterized by a series of gravity-driven flow paths, integral to urban wastewater conveyance
5. A governmental body tasked with formulating and enforcing environmental policies, including wastewater treatment regulations
6. A corrosion-resistant thermoplastic compound favored for its durability and longevity in sewage pipe fabrication
7. The holistic approach encompassing engineering design, material selection, and construction methodologies in sewage infrastructure deployment
10. A versatile energy source harnessed in district heating networks, often derived from combustion or geothermal reservoirs
13. A compact heat exchanger module employed in heat network distribution systems, facilitating thermal energy transfer between fluid streams