State Key Laboratory of Clean Energy Utilization, National Engineering Laboratory of Waste Incineration Technology and Equipment, Institute of Thermal Power Engineering of Zhejiang University, Hangzhou, 310027, Zhejiang, China.
State Key Laboratory of Clean Energy Utilization, National Engineering Laboratory of Waste Incineration Technology and Equipment, Institute of Thermal Power Engineering of Zhejiang University, Hangzhou, 310027, Zhejiang, China.
Chemosphere. 2021 Feb;265:129120. doi: 10.1016/j.chemosphere.2020.129120. Epub 2020 Nov 27.
The annual output of sewage in China is increasing rapidly and continues to grow, so there is an urgent need for a treatment other than landfills. Among various treatment methods, brick production coprocessing of sewage sludge is technically and economically advantageous. The emission characteristics of typical brick kiln coprocessing of sewage sludge with an annual production of 60 million bricks were studied. The major air pollutants and PCDD/Fs in gas and soil were determined. Particulate matter and SO contributed most before treatment, with concentrations of (1.017 ± 0.089) × 10 mg/Nm and (2.770 ± 0.251) × 10 mg/Nm, respectively. After cleaning, the average emitted concentrations of major air pollutants were permissive and homogeneous: 58.13 ± 5.51 mg/Nm for NO, 30.15 ± 9.12 mg/Nm for HCl, 28.63 ± 14.33 mg/Nm for SO, 23.76 ± 3.31 mg/Nm for particulate matter, and 356.8 ± 99.1 for odor. The PCDD/Fs in the exhaust gas and ambient air showed similar distributions and fingerprint characteristics. The annual emission amounts of the PCDD/Fs were 0.265 g/year and 0.0393 g TEQ/year. Moreover, correlation analysis indicated that PCDD/Fs were most relevant to HCl, and particulate matter might be important to SO and fluoride. Further relativity studies showed that the brick kiln was a source of PCDD/Fs but not a main source of major air pollutants to the surrounding environment. All the above pollutants from the brick kiln were permissive with relevant national standards. The results could help with pollution inventories for the brick and tile industry and sewage sludge disposal process.
中国的污水年排放量迅速增加且持续增长，因此急需一种除填埋以外的处理方法。在各种处理方法中，用砖生产协同处理污水污泥在技术和经济上都具有优势。研究了年产 6000 万块砖的典型砖窑协同处理污水污泥的排放特征。确定了气体和土壤中的主要空气污染物和 PCDD/Fs。处理前，颗粒物和 SO 贡献最大，浓度分别为（1.017±0.089）×10mg/Nm 和（2.770±0.251）×10mg/Nm。经清洗后，主要空气污染物的平均排放浓度是允许的且均匀的：NO 为 58.13±5.51mg/Nm，HCl 为 30.15±9.12mg/Nm，SO 为 28.63±14.33mg/Nm，颗粒物为 23.76±3.31mg/Nm，臭气为 356.8±99.1。废气和环境空气中的 PCDD/Fs 表现出相似的分布和指纹特征。PCDD/Fs 的年排放量为 0.265g/年和 0.0393g TEQ/年。此外，相关性分析表明，PCDD/Fs 与 HCl 最相关，颗粒物可能对 SO 和氟化物很重要。进一步的相关性研究表明，砖窑是 PCDD/Fs 的来源，但不是周围环境中主要空气污染物的主要来源。砖窑产生的所有上述污染物均符合相关国家标准。研究结果有助于砖和瓷砖行业的污染清单编制和污水污泥处理过程。
