Characteristics of wastewater treatment using a multi-soil-layering system in relation to wastewater contamination levels and hydraulic loading rates
Characteristics of wastewater treatment using a multi-soil-layering system in relation to wastewater contamination levels and hydraulic loading rates
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DOI：
10.1111/j.1747-0765.2007.00128.x
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发表时间：
2007-04-01
影响因子：
2
通讯作者：
Wakatsuki, Toshiyuki
中科院分区：
文献类型：
--
作者：
Masunaga, Tsugiyuki;Sato, Kuniaki;Wakatsuki, Toshiyuki
采用多土壤分层（MSL）系统，在两种废水污染水平（低水平[LWW]和高水平[HWW]）下，分别以30和70 mg L-1的平均生化需氧量（BOD）和500- 2，000 L·m（-2）·d（-1）的水力负荷率（HLR）进行废水处理的表征。尽管废水污染水平波动，但处理后沃茨中的BOD和总磷（T-P）浓度始终低于废水沃茨中的浓度。但是，处理后的水中总氮（T-N）浓度受废水中的水平的影响，并波动。总体而言，两种不同的废水污染水平并不影响处理后沃茨中污染物的平均浓度和MSL系统的平均去除百分比。平均去除百分比范围从90至96%的悬浮固体（SS），从88至98%的BOD，从83至94%的CODcr，从44至57%的T-N，和从63至89%的T-P。去除SS，BOD，化学需氧量（CODcr）和T-N的变化没有明显的影响。对于氮的去除，在处理后的水中的氧化还原电位（ORP）的负相关性观察，表明在系统中的还原条件的发展是通过反硝化过程的增强去除T-N的关键因素。在较低的HLR下，磷的平均去除率往往较高。随着进水浊度的增加，系统中磷与物料的接触时间缩短，磷的去除率降低。HWW各处理对BOD、CODcr、氮、磷的去除率（g m（-2）d（-1））均以最高浊度最高。然而，较高的HLR，特别是在HWW处理中，导致系统在运行早期堵塞。系统休息8周后，堵塞得到缓解。可推荐使用MSL系统的操作循环，其中使用系统的周期性静止时间来防止或减轻堵塞。
Characterization of wastewater treatment using a multi-soil-layering (MSL) system at two levels of wastewater contamination (a low level [LWW] and a high level [HWW]) with a mean biochemical oxygen demand (BOD) of 30 and 70 mg L-1, respectively, and at hydraulic loading rates (HLRs) of 500-2,000 L m(-2) day(-1) was conducted. Despite fluctuations in the wastewater contamination levels, the BOD and total phosphorus (T-P) concentration in the treated waters remained constantly lower than those in the wastewaters. However, the total nitrogen (T-N) concentration in the treated water was influenced by the level in the wastewater and fluctuated. In general, the two different levels of wastewater contamination did not influence the mean concentrations of the contaminants in the treated waters and the mean removal percentages in the MSL system. Mean removal percentages ranged from 90 to 96% for suspended solids (SS), from 88 to 98% for BOD, from 83 to 94% for CODcr, from 44 to 57% for T-N, and from 63 to 89% for T-P. Removal of SS, BOD, chemical oxygen demand (CODcr) and T-N was not appreciably influenced by changes in the HLR. For the removal of nitrogen, a negative correlation was observed with the oxidation-reduction potential (ORP) in the treated water, suggesting that the development of reduced conditions in the system was the key factor for the removal of T-N through the enhancement of the denitrification process. The mean removal percentage of phosphorus tended to be higher at lower HLRs. An increase in the HLR probably reduced the contact time of phosphorus and materials in the MSL system, which resulted in the decrease in the removal percentage. Removal rates (g m(-2) d(-1)) of BOD, CODcr, nitrogen and phosphorus were highest at the highest HLR in the HWW treatments. However, higher HLRs, especially in the HWW treatments, caused clogging of the system during the early periods of operation. Clogging was alleviated after an 8-week rest of the system. An operation cycle in which periodical resting time of the system is used to prevent or alleviate clogging could be recommended for the use of the MSL system.