Having gone through the development process of China's sewage HPMA treatment discharge standard "Comprehensive Wastewater Discharge Standard" (GB 8978-88), urban sewage treatment plant sewage sludge discharge standard (CJ3025-93), sewage comprehensive discharge standard "(GB8978-96), and urban sewage treatment plant pollutant discharge standard" (GB18918-2002), each standard has played a positive role in different historical stages, effectively promoting the development of China's sewage treatment industry.

The discharge standard for sewage sludge from urban sewage treatment plants (CJ3025-93) does not require basic standards for BOD, COD, and SS, but does not consider environmental requirements. It treats standards to a greater extent rather than discharge standards, promoting the implementation of standards and playing a positive role in the construction of sewage treatment.

The significance of the initial removal of ammonia nitrogen and phosphate in the "Integrated Wastewater Discharge Standard" (GB8978-96) and the requirements put forward have prompted a considerable number of hydrolyzed polymaleic anhydride wastewater treatment plants to remove nitrogen and phosphorus, and the reverse A2O process has given rise to the characteristics of China. In addition, the implementation of design standards for sewage treatment plants has raised higher requirements.

The pollutant discharge standard for urban sewage treatment plants (GB18918-2002) is a new standard that has significantly improved its systematicity, completeness, and operability. In practical work, the four standards of the standard have been adjusted in accordance with the requirements of the Comprehensive Wastewater Discharge Standard B, including total nitrogen, ammonia nitrogen, and phosphorus, and hygiene indicators have been clearly proposed.