Co-incinerating sewage sludge in municipal solid waste incinerators (MSWIs) is an up-to-date disposal way with great prospects to market. To verify the environmental safety of this disposal method, a field study was conducted in a MSWI which has achieved PCDD/Fs ultra-low emission. PCDD/F phase partitioning characteristics, congener profiles, and the influence of selective catalytic reduction (SCR) were also investigated. PCDD/F emission levels ranged from 0.0031 to 0.0053 ng I-TEQ/Nm³, distinctly lower than the national standard. For tests co-incinerating 5% sludge, PCDD/F emission levels were averagely 32% lower than tests mono-combusting municipal solid waste. The phase partitioning study found that PCDD/Fs enriched in condensed water took a non-negligible proportion of the total concentration in flue gas. The removal efficiency of SCR in tests co-incinerating sludge was averaged at 41.9%. However, in tests without adding sewage sludge, PCDD/F concentrations in flus gas after SCR were increased. It was found that the elevations were mainly attributed to the increase of low-chlorinated PCDF congeners in gas-phase. By inference, memory effect existing in SCR might be responsible for the increase of PCDD/F levels. PCDD to PCDF ratios in most of the sampling points were >1, suggesting that de novo synthesis is not the dominant formation pathway in the studied incinerator. This study verified that co-incinerating sewage sludge in the MSWI would not elevate the emission levels of PCDD/Fs. If all of the yielded municipal waste is incinerated with adding 5% sewage sludge, more than half of sewage sludge can be disposed safely in Shenzhen.

在城市固体废物焚化炉（MSWI）中共同焚化污水污泥是一种最新的处置方式，具有广阔的市场前景。为了验证这种处理方法的环境安全性，在MSWI中进行了现场研究，该方法已经实现了PCDD / Fs超低排放。还研究了PCDD / F相分配特性，同类物分布和选择性催化还原（SCR）的影响。PCDD / F排放水平范围为0.0031至0.0053 ng I-TEQ / Nm ³，明显低于国家标准。对于共焚化5％污泥的测试，PCDD / F排放水平平均比单燃烧城市固体垃圾的测试低32％。相分配研究发现，富含冷凝水的PCDD / Fs在烟气中的总浓度中所占的比例不可忽略。在共焚化污泥中，SCR的去除效率平均为41.9％。但是，在不添加污水污泥的测试中，SCR后烟气中PCDD / F的浓度增加了。发现该升高主要归因于气相中低氯化物PCDF同系物的增加。通过推断，SCR中存在的记忆效应可能是PCDD / F水平增加的原因。大多数采样点中PCDD与PCDF的比率> 1，这表明从头合成不是焚烧炉中主要的形成途径。这项研究证实，在MSWI中共同焚化污水污泥不会提高PCDD / Fs的排放水平。如果将所有产生的城市垃圾焚化并添加5％的污水污泥，则一半以上的污水污泥可以在深圳安全处置。