Low-carbon strategy for wastewater treatment plants based on cost reduction and efficiency improvement

doi:10.19965/j.cnki.iwt.2023-1172

Abstract

Abstract:

This study explored the low-carbon operation and control strategy of wastewater treatment plants based on cost reduction and efficiency improvement, with a South China plant as a case study. Factors influencing phosphorus removal, including sludge age, concentration, dissolved oxygen, reflux ratio, and chemical dosing location, were analyzed. Optimal operation parameters such as sludge concentration, air/water ratio, and dissolved oxygen level were established based on influent characteristics across seasons. Implementation of these low-carbon strategies ensures the plant's effluent quality remained within standards, exhibiting a stable and decreasing trend. Meanwhile, chemical consumption for phosphorus removal decreasesd by approximately 41%, the electricity consumption per ton of treated wastewater decreased by 26.5%, resulting in a reduction of indirect carbon emissions by 0.18 kg/t(calculated by CO_2,eq), which had achieved energy conservation, emission reduction, and clean production.

Key words: wastewater treatment, low-carbon operation, process control, nitrogen and phosphorus removal, cost-effectiveness

摘要：

研究了低成本、高处理要求下污水处理厂的低碳运行调控策略，以南方某污水处理厂为例，分析了影响除磷效率原因，发现主要的影响因素包括污泥龄、污泥浓度、溶解氧、回流比、药剂投加位置等，并根据不同季节的进水特征，制定了优化的运行参数，如污泥浓度、气水比、溶解氧水平等。通过实施低碳运行调控策略，该厂的出水水质仍可达到排放要求，且呈现稳中有降的趋势，同时，除磷药耗减少了约41%，吨水电耗下降了26.5%，碳排放间接减排0.18 kg/t（以CO_2，eq计），同步实现了节能降耗与清洁生产的目标。

关键词: 污水处理, 低碳运行, 工艺调控, 脱氮除磷, 降本增效

CLC Number:

X703

Juanjuan CHEN, Weibin LI, Ou HUANG, Weixiang CHAO, Diandian ZHANG, Nanqi REN, Lu LU. Low-carbon strategy for wastewater treatment plants based on cost reduction and efficiency improvement[J]. Industrial Water Treatment, 2024, 44(8): 53-60.

陈娟娟, 李伟斌, 黄鸥, 晁伟翔, 张典典, 任南琪, 路璐. 基于降本增效目标的污水处理厂低碳运行调控策略[J]. 工业水处理, 2024, 44(8): 53-60.

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URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2023-1172

https://www.iwt.cn/EN/Y2024/V44/I8/53

Figures/Tables 8

Fig.1 Wastewater treatment process of the investigated plant in South China

Table 1 Electric structure and environmental emission factors of chemicals and electricity in Guangdong Province in 2021

电力类型	2021年电量占比/%	碳排放因子（以CO_2，eq计）/（kg·kW^-1·h^-1）	富营养化因子（以N，P计）/（kg·kW^-1·h^-1）
硫酸铝		0.77	6.00×10^-4
燃煤发电	65.47	1.422	1.93×10^-4
燃气发电	3.73	0.729	1.01×10^-5
生物质	4.36	0.053	1.73×10^-5
光伏	1.63	0.087	9.32×10^-5
风电	2.16	0.027	8.11×10^-5
水电	3.56	0.006	1.98×10^-6
核电	19.09	0.014	2.43×10^-5

Fig.2 Optimal range of sludge concentration in biological tanks of the plant

Fig.3 Optimal range of air/water ratio in biological tanks of the plant

Table 2 Summary of optimal operation parameters of the plant

工况	污泥MLSS质量浓度/（mg·L^-1）	生化池气水比	调控前出水总磷/（mg·L^-1）	调控后出水总磷/（mg·L^-1）
雨季（5~9月）	2 500~3 000	3.58~3.02	0.16	0.10
旱季（1~4、10~12月）	3 500~4 000	2.87~1.41	0.11	0.07

Fig.4 Water quality variation of influents and effluents of the plant from 2019 to 2022

Fig.5 Chemical and electricity consumption variation for treatment of 1 ton wastewater of the plant from 2019 to 2022

Fig.6 Indirect carbon emission and water eutrophication potential variation of the plant from 2019 to 2022

References 20

1	谭显春，郭雯，樊杰，等. 碳达峰、碳中和政策框架与技术创新政策研究［J］. 中国科学院院刊，2022，37（4）：435-443．
	TAN Xianchun， GUO Wen， FAN Jie，et al. Policy framework and technology innovation policy of carbon peak and carbon neutrality［J］. Bulletin of Chinese Academy of Sciences，2022，37（4）：435-443．
2	任佳雪，高庆先，陈海涛，等. 碳中和愿景下的污水处理厂温室气体排放情景模拟研究［J］. 气候变化研究进展，2021，17（4）：410-419． doi:10.12006/j.issn.1673-1719.2021.026
	REN Jiaxue， GAO Qingxian， CHEN Haitao，et al. Simulation research on greenhouse gas emissions from wastewater treatment plants under the vision of carbon neutrality［J］. Climate Change Research，2021，17（4）：410-419． doi:10.12006/j.issn.1673-1719.2021.026
3	韩锡友，黄子进，方金强，等. MBBR应用于污水厂提量改造及其能耗药耗分析［J］. 净水技术，2021，40（12）：69-77． doi:10.15890/j.cnki.jsjs.2021.12.012
	HAN Xiyou， HUANG Zijin， FANG Jinqiang，et al. Application of MBBR in WWTP reconstruction for capacity expansion and analysis of energy and chemical consumption［J］. Water Purification Technology，2021，40（12）：69-77． doi:10.15890/j.cnki.jsjs.2021.12.012
4	雷明，夏海波，饶欠平. 污水厂强化生物硝化和除磷的研究及运行策略［J］. 环境科学与管理，2011，36（6）：89-92． doi:10.3969/j.issn.1673-1212.2011.06.024
	LEI Ming， XIA Haibo， RAO Qianping. Study and operation strategy on biological nitrification and phosphorus removal in wastewater treatment plant［J］. Environmental Science and Management，2011，36（6）：89-92． doi:10.3969/j.issn.1673-1212.2011.06.024
5	薛英岚，郭昉，杨逢乐，等. 污水处理厂季节性分类考核模式研究［J］. 生态经济，2018，34（7）：179-184．
	XUE Yinglan， GUO Fang， YANG Fengle，et al. A study on seasonal classified assessment mode of sewage treatment plants［J］. Ecological Economy，2018，34（7）：179-184．
6	王晓莲，王淑莹，王亚宜，等. 强化A²/O工艺反硝化除磷性能的运行控制策略［J］. 环境科学学报，2006，26（5）：722-727． doi:10.3321/j.issn:0253-2468.2006.05.004
	WANG Xiaolian， WANG Shuying， WANG Yayi，et al. Control strategies of enhancing denitrifying phosphorus removal performance of the conventional Anaerobic-Anoxic-Oxic process［J］. Acta Scientiae Circumstantiae，2006，26（5）：722-727． doi:10.3321/j.issn:0253-2468.2006.05.004
7	郑兴灿，尚巍，孙永利，等. 城镇污水处理厂一级A稳定达标的工艺流程分析与建议［J］. 给水排水，2009，35（5）：24-28． doi:10.3969/j.issn.1002-8471.2009.05.006
	ZHENG Xingcan， SHANG Wei， SUN Yongli，et al. Analysis and suggests on the municipal wastewater treatment plant process with stable first level A attainment［J］. Water & Wastewater Engineering，2009，35（5）：24-28． doi:10.3969/j.issn.1002-8471.2009.05.006
8	张亚勤. 污水处理厂达到一级A排放标准中的化学除磷［J］. 中国市政工程，2009（5）：40-41． doi:10.3969/j.issn.1004-4655.2009.05.018
	ZHANG Yaqin. Chemical phosphorus removal for achieving 1A standard in waste water treatment plant［J］. China Municipal Engineering，2009（5）：40-41． doi:10.3969/j.issn.1004-4655.2009.05.018
9	宋晓乔，周涛，任天龙，等. 我国城镇生活污水厂除磷技术研究进展［J］. 山东化工，2020，49（8）：295-296．
	SONG Xiaoqiao， ZHOU Tao， REN Tianlong，et al. Research progress of phosphorus removal technology in urban domestic sewage plants in China［J］. Shandong Chemical Industry，2020，49（8）：295-296．
10	方茜，张朝升，张可方，等. 污泥龄及pH值对同步硝化反硝化过程的影响［J］. 广州大学学报（自然科学版），2008，7（3）：50-54． doi:10.3969/j.issn.1671-4229.2008.03.012
	FANG Qian， ZHANG Chaosheng， ZHANG Kefang，et al. Effect of sludge age and pH value on simultaneous nitrification and denitrification（SND）［J］. Journal of Guangzhou University （Natural Science Edition），2008，7（3）：50-54． doi:10.3969/j.issn.1671-4229.2008.03.012
11	王建龙，彭永臻，王淑莹. 污泥龄对A²/O工艺脱氮除磷效果的影响［J］. 环境工程，2007，25（1）：16-18．
	WANG Jianlong， PENG Yongzhen， WANG Shuying. Nitrogen and phosphorus removal performance of A²/O progess as a function of the sludge age［J］. Environmental Engineering，2007，25（1）：16-18．
12	王德美，王晓昌，唐嘉陵，等. 不同回流比和SRT对A/O-MBR脱氮除磷的影响［J］. 工业水处理，2016，36（1）：55-58． doi:10.11894/1005-829x.2016.36(1).055
	WANG Demei， WANG Xiaochang， TANG Jialing，et al. Influences of different reflux ratio and SRT on denitrification and dephosphorization in A/O-MBR［J］. Industrial Water Treatment，2016，36（1）：55-58． doi:10.11894/1005-829x.2016.36(1).055
13	魏双勤，刘媛. 废水除磷方法与原理的研究进展［J］. 中国环保产业，2010（10）：28-34． doi:10.3969/j.issn.1006-5377.2010.10.007
	WEI Shuangqin， LIU Yuan. Study progress on phosphorus removal process and principle from wastewaters［J］. China Environmental Protection Industry，2010（10）：28-34． doi:10.3969/j.issn.1006-5377.2010.10.007
14	张雪飞. 污水处理生物脱氮除磷工艺的分析［J］. 清洗世界，2023，39（3）：93-95．
	ZHANG Xuefei. Analysis of biological nitrogen and phosphorus removal process for sewage treatment［J］. Cleaning World，2023，39（3）：93-95．
15	谭涛，刘扬，朱士江. 不同运行参数操控下AAO工艺脱氮除磷效果优化研究［J］. 水处理技术，2023，49（6）：94-100． doi:10.16796/j.cnki.1000-3770.2023.06.018
	TAN Tao， LIU Yang， ZHU Shijiang. Optimization of nitrogen and phosphorus removal effect of AAO process under different operation parameters［J］. Technology of Water Treatment，2023，49（6）：94-100． doi:10.16796/j.cnki.1000-3770.2023.06.018
16	马博原，周少奇，朱明石，等. 不同混合液回流比对改良AAO一体化设备脱氮除磷影响［J］. 中国水运（下半月），2022，22（11）：65-67．
17	贾军峰，吴俊奇，王真杰，等. 不同化学药剂的除磷效果及经济性分析［J］. 应用化工，2020，49（6）：1381-1385．
	JIA Junfeng， WU Junqi， WANG Zhenjie，et al. Phosphorus removal effect and economic analysis of different chemicals［J］. Applied Chemical Industry，2020，49（6）：1381-1385．
18	侯培强，宋静文，王启镔，等. 基于碳源储存的污水生物脱氮除磷效率及污水处理系统延伸成本分析［J］. 环境工程学报，2023，17（4）：1138-1144．
	HOU Peiqiang， SONG Jingwen， WANG Qibin，et al. Biological nitrogen and phosphorus removal efficiency of wastewater based on carbon source storage and cost analysis of sewage treatment system extension［J］. Chinese Journal of Environmental Engineering，2023，17（4）：1138-1144．
19	操梦颖，杜俊逸，桂梦瑶，等. 多种进水碳源条件下侧流活性污泥工艺的脱氮除磷机制［J］. 环境科学学报，2022，42（2）：126-137．
	CAO Mengying， DU Junyi， GUI Mengyao，et al. Nitrogen and phosphorus removal mechanisms of the sidestream activated sludge process based on diverse inlet carbon sources［J］. Acta Scientiae Circumstantiae，2022，42（2）：126-137．
20	GB 50014—2021 室外排水设计规范［S］. doi:10.12173/j.issn.1004-5511.202302011

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