厌氧消化污泥重金属铬形态分布及稳定剂对其稳定效果研究

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【中图分类号】： ×703 【文献标志码】：A 【文章编号】：1008-3197（2025）05-74-03

【DOI编码】：10.3969/j.issn.1008-3197.2025.05.017

Study on the Morphological Distribution of Heavy Metal Chromium in Anaerobic Digestion of Sludge and the Stabilization Effect of Stabilizers on Sludge Stability

CAO Yong

（Tianjin Capital Environmental Protection Group Co.，Ltd.，Tianjin 3oo381，China）

【Abstract】：Inresponse to the problem of heavy metal chromium（Cr）polution in urban sludge restrictingitsresource utilization，this study takes anaerobic digestion sludge as theobjectand explores thestabilizing effectof hydroxyapatite（HAP）on Cr.By adding HAP with sludge dry weight of 2% ， 5% ，and 10% ，the distribution of Cr forms and leaching rate were analyzed using BCR continuous extraction method and HJ/T 299—2007 Soild waste-Extration proceduceforleaching toxicity-Sulp-uricacid &nitric acid method leaching toxicity test.The results showed that anaerobic digestion process can achieve a stable Cr content of 80% in sludge;After the addition of HAP，the stability rate of Cr leaching approached 100% ，the proportion of stable state increased to over 90% ，and the proportion of residual state was positively correlated with the dosage （R=O.914）. The comprehensive effect shows that 2% HAP can achieve high efficiency and stability.

【Key words】： sludge treatment; chromium;anaerobic digestion;hydroxyapatite stabilizers

城镇污泥土地利用是污泥资源化的重要途径，但污泥重金属污染问题是目前制约污泥资源化利用的重要因素。（剩余3086字）