Reusing greywater (GW) can lower domestic water consumption. However, the GW must be treated and disinfected for securing user health. This research studied at the laboratory scale, and in flow-through setups, which are generally used in full-scale GW treatment the disinfection efficiency of the two commonly used technologies (a) chlorination and (b) low-pressure UV irradiation. The disinfection methods were studied under a commonly found range of total suspended solids (TSS; 3.9–233 mg/L) and 5-d biochemical oxygen demand (BOD₅) concentrations (0–107 mg/L) as a representative/proxy of bioavailable organic matter. The negative effect of TSS began even at low concentrations (<20 mg/L) and increased consistently with increasing TSS concentrations across all the concentrations tested. On the other hand, the negative effect of BOD₅ on FC inactivation was observed only when its concentration was higher than 50 mg/L. Multiple linear regression models were developed following the laboratory results, establishing a correlation between FC inactivation by either chlorination or UV irradiation and initial FC, TSS, and BOD₅ concentrations. The models were validated against the results from the flow-through reactors and explained the majority of the variability in the measured FC inactivation. Conversion factors between the laboratory scales and the flow-through reactor experiments were established. These enable the prediction of the required residual chlorine concentration or the UV dose needed for an on-site flow-through reactor. This approach is valuable from both operational and research perspectives.

中文翻译：

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悬浮物和有机物对灰水氯和紫外线消毒效率的影响

重复使用中水（GW）可以降低家庭用水量。但是，必须对GW进行处理和消毒以确保用户健康。这项研究在实验室规模和流通装置中进行了研究，这些装置通常用于大规模GW处理中，这两种常用技术的消毒效率（a）氯化和（b）低压UV照射。在常见的总悬浮固体（TSS; 3.9–233 mg / L）和5天生化需氧量（BOD ₅）范围内研究了消毒方法）浓度（0–107 mg / L）作为生物可利用有机物的代表/代表。TSS的负面影响甚至在低浓度（<20 mg / L）时就开始出现，并且在所有测试浓度下都随着TSS浓度的增加而持续增加。另一方面，仅当BOD ₅的浓度高于50 mg / L时，才观察到BOD ₅对FC失活的负面影响。根据实验室结果开发了多个线性回归模型，建立了氯化或紫外线照射导致的FC失活与初始FC，TSS和BOD之间的相关性₅浓度。对照流过反应器的结果对模型进行了验证，并解释了所测FC失活的大部分可变性。建立了实验室规模和流通式反应器实验之间的换算系数。这些能够预测现场流通式反应器所需的残余氯浓度或紫外线剂量。从操作和研究的角度来看，这种方法都是有价值的。