A note on cost‐effectiveness in data acquisition in water quality management

Nielsen, Knud Strange; Friborg, Niels; Bundgaard-Nielsen, M.

doi:10.1029/wr011i002p00357

Cited by 6 publications

(1 citation statement)

References 1 publication

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“…NO3-N is measured with UV spectrophotometry; NO2-N is measured with N-(1naphthyl)-ethylenediamine hydrochloride method. The content of dehydrogenase in activated sludge is measured with a maturer and stabler method-TTC method, the activity of dehydrogenize (DHA) is analyzed with the method in literature 8 .…”

Section: Methodsmentioning

confidence: 99%

Effect of the Different COD/N Ratios on Multilevel Anaerobic/oxic Step-Feed Process for Integrated Removal of Carbon, Nitrogen and Phosphorus

Chen¹,

Zhang²,

Ren³

et al. 2013

Asian J. Chem.

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The present object of this stuidy is to investigate the effect of the different COD/N ratio on multilevel anaerobic/oxic (A/O) step-feed process for nitrogen and phosphorus removal used actual life sewage. The experiment designed the fluctuation of influent C/N ratio ranging from 4 to 8 and studied the variation rules of COD, NH3-N, NO3-N, NO2-N, total nitrogen, total phosphorus in the multilevel A/O process. Results showed when the influent C/N ratio was from 4 to 8, the C/N ratio on the removal efficiencies of COD and NH3-N was not significant, and COD average removal efficiency was 89.2 %, NH3-N average removal efficiency was 96.5 %. But the influent C/N ratio on denitrification and biological phosphorus removal effect was obvious, the total nitrogen removal rate increased from 44.7 to 68.9 to 87.3 % when the influent C/N ratio increased from 4 to 6 to 8. In the absence of specialized set of anaerobic zone condition, the total phosphorus removal efficiency had worked in certain. The total phosphorus removal rate increased from 58.7 to 64.7 to 71.8 % when the influent C/N ratio increased from 4 to 6 to 8.when the influent C/N ratio was 8, the effluent total phosphorus is 0.86 mg/L.

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Section: Methodsmentioning

confidence: 99%

Effect of the Different COD/N Ratios on Multilevel Anaerobic/oxic Step-Feed Process for Integrated Removal of Carbon, Nitrogen and Phosphorus

Chen¹,

Zhang²,

Ren³

et al. 2013

Asian J. Chem.

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Reversibility of Man‐Induced Eutrophication. Experiences of a Lake Recovery Study in Sweden

Ryding

1981

Intl Review of Hydrobiology

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Recovery of polluted lakes is a complicated process involving many factors. Different lake rehabilitation techniques and former experiences with advanced wastewater treatment and sewage diversion are reviewed. The response in water quality after a nutrient reduction may vary significantly, despite a lowering of the phosphorus concentration in the lake. The different factors influencing the process, such as climatic fluctuations, the growth‐limiting effect of nutrients and phosphorus release from the sediments, are discussed, based on examples from a lake recovery study in Sweden carried out in 30 lakes. Due to various interrelationships between physical characteristics and biological mechanisms involved, and to significant fluctuations in these factors from one year to the next, it is difficult to generalize and to forecast the actual response of a certain water body to a reduced nutrient input. Unfortunately, too many monitoring programmes aimed at elucidating the effects of remedial efforts are not designed in such a manner that relevant information can be obtained about the nutrient load — lake response relationships. Ways for optimizing and increasing the predictive power of inventory studies and monitoring programmes are discussed.

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Progress in the design of hydrologic‐data networks

Moss¹,

Tasker²

1979

Reviews of Geophysics

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The design of hydrologic‐data networks is a topic that previously has not been raised to the status of a separate article in the U.S. National Reports to the International Union of Geodesy and Geophysics. However, three articles (Matalas, 1975; Peck, 1975; Schwarz, 1975) in the 1970–1974 Report considered it significant enough to be included as specific sections. Thus, because of the novelty of this article, some references will be made to work performed prior to the report period of 1975–1978 for the sake of completeness. The collection of hydrologie data has been perceived as a design problem only within the past few decades. Although some earlier work had been done in the area of precipitation gaging networks, Langbein (1954) presented the first comprehensive description of what needed to be done to manage objectively a hydrologic‐data program.

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A note on cost‐effectiveness in data acquisition in water quality management

Cited by 6 publications

References 1 publication

Effect of the Different COD/N Ratios on Multilevel Anaerobic/oxic Step-Feed Process for Integrated Removal of Carbon, Nitrogen and Phosphorus

Effect of the Different COD/N Ratios on Multilevel Anaerobic/oxic Step-Feed Process for Integrated Removal of Carbon, Nitrogen and Phosphorus

Reversibility of Man‐Induced Eutrophication. Experiences of a Lake Recovery Study in Sweden

Progress in the design of hydrologic‐data networks

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