Abstract：
:Three bench-scale rock filters containing 0.6 m of gravel were used in this investigation. Two of the filters were planted withSagittaria Iancifolia andScirpus validus, while the third filter was an unvegetated control filter. The wastewater directed through these systems was a synthetic mixture containing nutrient broth as the carbon source. An 80-day experiment was run on the filters using eight combinations of two flow rates and four influent biochemical oxygen demand (BOD5) concentrations, each combination remaining constant for ten days. These combinations resulted in BOD5 surface loadings from 4.63-30.96 g/day/m(2). From other studies of batch and continuous flow rock-plant filter systems, the first-order BOD5 reaction rate constant was found to decrease exponentially with detention time. In this study, however, little correlation was found between BOD5 loading rate and removal percentages, which averaged 69%, 57%, and 47% for theScirpus, Sagittaria, and control systems, respectively. This is probably due to the relatively small change in detention times studied and the short time period of each loading rate. Oxidation/reduction potential (ORP) and dissolved oxygen (DO) measurements within these systems indicated that no free oxygen was available at any depth. Total Kjeldahl nitrogen (TKN) removal was higher in the plant systems relative to the control, with theScirpus system achieving a higher overall removal than theSagittaria system.
journal_name
Environ Monit Assessjournal_title
Environmental monitoring and assessmentauthors
Skipper D,Tittlebaum Mdoi
10.1007/BF00554091subject
Has Abstractpub_date
1993-08-01 00:00:00pages
69-80issue
1eissn
0167-6369issn
1573-2959journal_volume
27pub_type
杂志文章abstract：:Climatic and hydrologic variations between the decades 1976-1985 and 1986-1995 are examined at 34 climate stations and 275 hydrology stations. The variations in climate are distributed across a broad spatial area. Temperatures were generally warmer in the most recent decade, with many stations showing significant incr...
journal_title：Environmental monitoring and assessment
pub_type： 杂志文章
doi：10.1023/a:1006438723879
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journal_title：Environmental monitoring and assessment
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journal_title：Environmental monitoring and assessment
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journal_title：Environmental monitoring and assessment
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journal_title：Environmental monitoring and assessment
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journal_title：Environmental monitoring and assessment
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journal_title：Environmental monitoring and assessment
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