Analysis of operation efficiency and carbon emission of quasi Class Ⅳ upgrading and reconstruction of a sewage treatment plant

doi:10.19965/j.cnki.iwt.2024-0196

Abstract

Abstract:

In order to meet the requirements of sewage treatment capacity and treatment standards, a sewage treatment plant in Shandong was upgraded and reconstructed based on the Class A water quality standard of “Pollutant Discharge Standards for Urban Sewage Treatment Plants” (GB 18918-2002). The advanced treatment process of “high efficiency sedimentation tank+denitrifying deep bed filter” was adopted, and the sewage treatment facility of “pretreatment+AAO+high efficiency sedimentation tank+denitrifying deep bed filter+ultraviolet/sodium hypochlorite disinfection” with a scale of 60 000 m³/d was expanded. The pollutant removal efficiency and carbon emission distribution during sewage treatment process before and after renovation were analyzed. The results showed that the removal effect of pollutants was further strengthened and consolidated after the transformation, and the average effluent TN and TP were 7.09 mg/L and 0.06 mg/L, respectively, and the removal rates of TN and TP reached 94.7% and 99.1%, respectively. The effluent quality(except TN) reached the Class Ⅳ standard of the Environmental Quality Standards for Surface Water(GB 3838-2002). CH₄ contributed the most to carbon emission before and after the transformation. After the transformation, the proportion of electricity consumption in the overall carbon emission increased by 16.49%, while the carbon emission generated by the consumption of water agent decreased by 27.69%, from 0.585 kg/m³ to 0.423 kg/m³.

Key words: upgrading and reconstruction, high efficiency sedimentation tank, denitrifying deep bed filter, carbon emission

摘要：

山东某污水处理厂为满足污水处理量和处理标准的要求，在《城镇污水处理厂污染物排放标准》（GB 18918—2002）一级A水质标准上进行提标改造，并采用“高效沉淀池+反硝化深床滤池”深度处理工艺，扩建了规模为60 000 m³/d的“预处理+AAO+高效沉淀池+反硝化深床滤池+紫外线/次氯酸钠消毒”污水处理设施。对改造前后污染物去除效果及污水处理过程中的碳排放量分布进行分析，结果表明，改造后污染物的去除效果得到进一步强化与巩固，出水平均TN、TP分别为7.09、0.06 mg/L，去除率分别达到94.7%和99.1%，出水水质（TN除外）稳定达到《地表水环境质量标准》（GB 3838—2002）的Ⅳ类水标准；改造前后对碳排放贡献最大的均为CH₄，改造后电耗在整体碳排放中占比增加16.49%，而药耗所产生的碳排放量降低了27.69%，由0.585 kg/m³减至0.423 kg/m³。

关键词: 提标改造, 高效沉淀池, 反硝化深床滤池, 碳排放

CLC Number:

X784

Bo YU, Jiao MA, Xiaoning LI, Pengfei SHEN. Analysis of operation efficiency and carbon emission of quasi Class Ⅳ upgrading and reconstruction of a sewage treatment plant[J]. Industrial Water Treatment, 2024, 44(10): 222-230.

余波, 马娇, 李箫宁, 沈鹏飞. 某污水处理厂准Ⅳ类提标改造运行效能及碳排放分析[J]. 工业水处理, 2024, 44(10): 222-230.

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URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2024-0196

https://www.iwt.cn/EN/Y2024/V44/I10/222

Figures/Tables 10

Table 1 Inlet and outlet water quality and designed indicators of sewage treatment plant

项目	COD_Cr	BOD₅	SS	NH₃-N	TN	TP
原设计进水水质限值	500	260	280	40	45	7
改造前实际进水水质	49~500	21.2~268	57~533	5.3~44.4	15.2~53	1.0~6.98
原设计出水水质限值	50	20	10	5	15	0.5
改造前实际出水水质	7.9~31	0.74~2	0.45~9	0.05~2.9	3.84~14.9	0.03~0.5
改扩建工程设计进水水质限值	500	250	320	50	40	6
改扩建工程设计出水水质限值	30	6	10	1.5	10	0.3

Fig.1 Process flow after renovation and expansion

Fig.2 Process flow of denitrification deep bed filter

Fig.3 Effect of SS removal before and after upgrading

Fig.4 Effect of COD removal before and after upgrading

Fig.5 Effect of NH₃-N removal before and after upgrading

Fig.6 Effect of TN removal before and after upgrading

Fig.7 Effect of TP removal before and after upgrading

Fig.8 Comparison of carbon emission before and after upgrading

Fig.9 Carbon emission distribution

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