# Research Status and Development Trend of Wastewater Treatment Technology and Its Low Carbonization
## 3 Low-Carbon Sewage Treatment Technology
Therefore, in order to solve this problem, [PERSON] [58] described the research process of oxygen demand in the activated sludge process at home and abroad, and the energy-saving technology of the microporous aeration system, and compared the microporous aerator with the perforated tube; it was proven that the former saves 4.4% more electricity compared with the latter. [PERSON] [59] et al. proposed a design concept of subsection control of dissolved oxygen concentration in an aeration tank by discussing oxygen demand and its distribution in the aeration tank, and applying oxygen transfer theory. If this design concept is applied to engineering practice, compared with the conventional design method, the energy consumption and equipment capacity of an aeration system can be reduced by about 15%. The author believes that energy consumption can be properly reduced through intelligent regulation of aeration equipment. At the same time, the metabolism mode of activated sludge microorganisms can be acclimated or changed to reduce the consumption of oxygen, or even operate without oxygen, or be combined with photosynthetic bacteria to achieve metabolism through photocooperation instead of oxygen energy consumption; these studies are very meaningful. As for the problem of sludge disposal, the author believes that the energy consumption of sludge disposal can be compensated by incineration power generation to achieve low carbonization as far as possible. In addition, the treated sludge can also be recycled as building materials and land fertilizer, to achieve the purpose of sustainable development [60; 61; 62]. The adsorption-regeneration activated sludge method and delayed aerated activated sludge method make good use of the residual sludge and reduce the sludge load. The sludge remains in a state of endogenous metabolism, thus greatly reducing the generation of residual sludge. Therefore, the problem of low carbonization in these two process systems is mainly the energy consumption of aeration. Similarly to the above four process systems, to solve the problem of aeration energy consumption, it is still necessary to change the microbial nature of activated sludge or reduce energy consumption as much as possible. At present, [PERSON] et al. [63], considering the development stage and international development trend of our country, put forward the development concept of \"green, low-carbon, resource recycling, environmentally friendly, locally-adapted conditions\" and corresponding key measures. [PERSON] et al. [64] proposed that sludge is a pollutant with utilization value, and can become a resource as long as the sludge is treated and disposed by certain means. This is of great significance for improving the ecological environment, while also helping to reduce the consumption of natural resources and promote the sustainable development of cities in the process of recycling. For low-carbon sewage treatment technology, the main emission reduction measures are summarized as follows: resource recovery carbon conversion and reuse, comprehensive treatment of low carbon and carbon sequestration, operation parameter optimization and process improvement, reasonable carbon distribution, and other related upgrading and renovation treatment technologies. The discussion of the low-carbon operation modes in these sewage treatment processes is summarized in Table 2 below. All kinds of water treatment technologies are gradually upgraded and reformed. While high water treatment efficiency is required, clean treatment technologies such as low-carbon emission continue to emerge, and some sewage treatment plants have put them into use and achieved good results [65, 66, 67]. Therefore, this paper analyzes the current research status of low-carbon sewage treatment technology and the prospects for development in the future, so as to provide guidance for more understanding of low-carbon sewage treatment technology.