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Analysis of Thoughts on Transformation and Upgrading of Wastewater Treatment Plant

Date:2021-04-23

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The country is now going to be "carbon neutral", and sewage treatment has always been considered a major energy consuming consumer. Traditional sewage treatment is actually the adjustment and combination of the four dimensions of residence time, treatment space, input energy, and material consumption.

 

 The sewage treatment standards have been raised repeatedly, energy consumption has become higher and higher, and this conversion has become more and more prominent. The clear water may not be the blue sky at the same time. The water pollutants caused by energy consumption are converted to CO2, CH4, N2O, NH3, H2S and other greenhouse gases. , The high standard of effluent water quality is realized by the transfer of pollution forms in the form of energy and material consumption. The current upgrade plan for wastewater treatment plants currently mainly includes: adding biochemical units such as post-denitrification filters and membrane processes, adding chemical phosphorus removal and additional carbon sources; adding subsequent physical and chemical treatment units such as high-efficiency sedimentation and sand filters. The carbon emissions of water treatment industries such as sewage treatment account for about 2% of global carbon emissions.

 

 In the past five years, there have been reports of many urban sewage treatment plants achieving energy surpluses abroad. The Netherlands has implemented their sewage treatment plant 2030 carbon neutral plan as early as 2010. Sewage treatment will not be delayed, but can also become a carbon neutral plan. The pacesetter industry.

 

 In 2019, they cooperated with the European Horizon 2020 project FIWARE4Water. In order to reduce greenhouse gas N2O emissions, experiments were carried out on one of the processing lines, sensors were installed, and artificial intelligence algorithms were combined to perform real-time process parameters for up to three years. monitor. The largest sewage plant in the Netherlands was put into operation in 2006, using an improved UCT process (mUCT) to treat a population equivalent of about 1 million people. The sewage plant itself has a traditional sludge anaerobic digestion system, and the annual output of biogas is about 12 million cubic meters. Shared with the waste incineration plant (AVI) next door. The sewage plant and the incineration plant coexist, and the sludge is also incinerated here. In addition to treating the sludge of the sewage plant, the incineration plant also supplies the sewage plant with electricity (20,000+MWh/year) and hot water (85,000GJ/year). In addition, surplus electricity and waste heat are integrated into Amsterdam's green power grid and heating system.

 

 my country’s sewage treatment industry has inherent deficiencies in its construction in many places. It faces many problems such as blindness in planning, mixed technology, and hysteresis in the pipeline network. There are also water quality standards, low influent concentration, sewage overflow, and sludge. The way out and other issues. The sewage treatment operation mode that aims to reduce the total amount of pollutants and meet the water environment quality standards of the river basin, and the responsibility-oriented sewage treatment construction mode to rapidly increase the sewage treatment rate and make up for the shortcomings of environmental infrastructure, digest these congenital shortcomings and Acquired imbalance has made all sewage treatment plants work hard to enter the era of low-carbon green development, whether it is the external force of standing or following the green and low-carbon development, or the domestic demand for energy saving and consumption reduction to enhance the core competitiveness of the enterprise, the new pattern of the sewage treatment industry is adjusted It is unavoidable.

 

 Energy consumption is not the main problem of the sewage treatment plant. An anaerobic digestion process has been used to treat sludge very early, and the recovered energy can cover 60-70% of the power consumption of the plant. With the passage of time, the original AB process of the wastewater treatment plant could not keep up with the economic development speed of the surrounding areas. Two upgrades and transformations introduced the SHARON side-stream denitrification process to reduce the ammonia nitrogen load produced by anaerobic fermentation. The aerobic granular sludge process was introduced for the second time to meet the demand of new treatment load.

 

 The stoichiometry and stable isotopes of particulate organic matter in water bodies are important tools to understand the biogeochemical processes related to plankton dynamics and eutrophication. Stable isotopes of particulate organic matter have been widely used to study element cycles and identify element sources. The size of the particle organic matter in the water body is an important functional trait. The size of most free-living bacteria is usually less than 3 μm, and the individual freshwater planktonic algae are mostly in the range of 3-20 μm, which can affect the bio-utilization of nutrients in the aquatic ecosystem and the bio-earth Chemical cycle.

 

 Optimize the collection and use of water resources tax, formulate a plan for peaking and balancing water resources, and make overall allocation of water resources usage quotas. Water resource quotas can be exchanged in an orderly, effective, and valuable way. As an effective supplement to ecological compensation, it converts green ecology into value and promotes balanced regional development.