# Research Status and Development Trend of Wastewater Treatment Technology and Its Low Carbonization
###### Abstract  
With the rapid development of the social economy, the demand for water resources is gradually increasing, and the corresponding impact of water pollution is also becoming more severe. Therefore, the technology of sewage treatment is developing rapidly, but corresponding problems also arise. The requirements of energy conservation and emissions reduction under the goal of carbon neutrality and dual carbon pose a challenge to the traditional concept of sewage treatment, and there is an urgent need for low-carbon sewage treatment technology aiming at energy conservation, consumption reduction and resource reuse. This review briefly introduces conventional sewage treatment technology and low-carbon sewage treatment technology, and analyzes the research status and development trend of low-carbon sewage treatment technology in detail. The analysis and comparison of conventional and low-carbon sewage treatment technologies is expected to provide a theoretical basis for the practical engineering application of low-carbon sewage treatment technologyto achieve the goal of carbon neutrality. It is of great significance to promote the sustainable development of society and the economy. sewage treatment; low-carbon technology; research status; sustainable development +
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in society as a whole was increasing year by year [11]. At present, sewage treatment technology in our country consists mainly of conventional pretreatment and conventional advanced treatment, two treatment units, and the treatment methods used differ according to sewage quality and other factors. However, whether physical or biochemical treatment is adopted, a large amount of resources and energy is consumed in the process [12]. In addition, a large number of additional pollutants such as CO\({}_{2}\), CH\({}_{4}\) and N\({}_{2}\)O are produced in the treatment process, which is the main contribution of the sewage treatment system to global warming. To some extent, this is a non-green means of changing water quality via energy consumption by energy dissipation and pollution transfer [13]. At the same time, a variety of pollutants contained in sewage are rarely recovered for use, resulting in a great waste of resources [14]. Effective exploitation and utilization of potential resources in sewage or sludge is a means of achieving low carbonization of sewage treatment. It is very important to vigorously develop energy-saving and low-carbon sewage treatment technology for each treatment process and treatment unit. With the demand for water resource protection and recycling due to economic and social development, sewage treatment in all aspects will increase significantly in the future [15; 16]. Therefore, in large sewage treatment systems, low-carbon treatment technology should be promoted in all aspects, and any available resources, whether pollutants themselves or products generated by the treatment process, should be fully utilized to carry out reasonable carbon conversion [17]. In the treatment technology, those processes with high energy consumption and low treatment efficiency should be eliminated, and the treatment process should be improved by means of co-construction or expansion. In addition, accurate assessment of sewage quality and targeted water treatment should be achieved through automated control, to replace tedious and unstable manual control. The operating parameters of each processing unit should be optimized on the basis of accurate assessment, and the best processing effect achieved, while minimizing resource and energy consumption [18; 19]. Through the research and development of emerging sewage treatment technologies at home and abroad, new sewage treatment technologies, new materials or microorganisms can be developed to achieve lowcarbon, carbon reuse, carbon sequestration and other clean and green treatment technologies as much as possible.