Influence of sludge deposit layer on sludge treatment reed beds treating septage

Yu Zhe Huong, Yee Yong Tan, Fu Ee Tang, Agus Saptoro
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Abstract

There is a lack of study on the influence of the sludge deposit layer on the performance of sludge treatment reed beds (STRBs) treating septage as well as the sludge deposit characteristics due to the operational parameters of solids loading rate (SLR) and resting periods. The laboratory-scale STRB was operated under varying SLRs and resting periods to investigate the sludge deposit characteristics, dewatering efficiency, and the quality of the rejected water. Inadequate operation, such as excessive loading and insufficient resting period, resulted in prolonged surface ponding, and the total solids (TS) content failed to meet the disposal standard of 20%. This study found that the STRB operated with 100 kg/m2/year SLR and 6-day resting period performed the best in sludge dewatering and stabilization, as the final TS content and total volatile solids/TS ratio of the sludge deposit were 23 and 33%, respectively. Meanwhile, the moisture content always remained higher than the plastic limit, preventing severe surface cracking that led to poor rejected water quality. In addition, the average COD and TS removals in the rejected water from all STRBs reached 96 and 88%, respectively, revealing that the proposed system is promising and reliable in treating septage.

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污泥沉积层对处理粪便的污泥处理芦苇床的影响
关于污泥沉积层对污泥处理芦苇床(STRB)处理粪便性能的影响,以及污泥沉积特性因固体负荷率(SLR)和静置期等运行参数而产生的影响,目前还缺乏研究。实验室规模的 STRB 在不同的固体负荷率和静置期下运行,以研究污泥沉积特性、脱水效率和废水水质。运行不当(如负荷过高和静置期不足)会导致表面长期积水,总固体(TS)含量达不到 20% 的处置标准。本研究发现,以 100 公斤/平方米/年的可吸入比和 6 天的静置期运行的 STRB 在污泥脱水和稳定化方面表现最佳,污泥沉积物的最终 TS 含量和总挥发性固体/TS 比率分别为 23% 和 33%。同时,含水率始终高于塑性极限,防止了严重的表面龟裂而导致剔除水水质变差。此外,所有 STRB 的废水中 COD 和 TS 的平均去除率分别达到 96% 和 88%,这表明所建议的系统在处理粪便方面具有良好的前景和可靠性。
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