Total Kjeldahl nitrogen

SCWO Supercritical Water Oxidation TKN Total Kjeldahl Nitrogen TOC Total Organic Carbon TSS Total Suspended Solids WAO Wet Air Oxidation... 

COD, chemical oxygen demand TKN, total Kjeldahl nitrogen TSS, total suspended solids VSS, volatile suspended solids TOC, total organic carbon. 

The whole column, apart from a small portion of the sediment, is sam pled in this way. The chemical checks were carried out every 15 days, determining pH, Conductivity, C.O.D., Ammoniacal Nitrogen, Orthophosphate Phosphorus and, furthermore, each month Total phosphorus, Total Kjeldahl Nitrogen, Total Solids and Volatile Solids. The methods utilized are those indicated in the Standard Methods (A.P.H.A., 1980). The amount of matter particles sedimented in the tanks was estimated with the use ol appropriate sampling devices located at the bottom of the tanks and withdrawn after a variable permanence of 40 to 60 days. 

Attached-growth waste stabilization ponds have been used to remove 65-70% TKN (total Kjeldahl nitrogen), and 70-83% NH3-N from concentrated latex and rubber sheet plant wastewaters [8]. A combined algae and water hyacinth system has been used to remove 96.41% COD, 98.93% TKN, 99.28% NH3-N, 100% NO2-N, and 100% NO3-N [9]. 

Technicon Instruments Corp. (1977) Digestion and Sample Preparation for the Analysis of Total Kjeldahl Nitrogen and/or Total Phosphorus in Food and Agricultural Products using the Technicon BD-20/40 Block Digestor, Technicon Industrial Method No.369-75A, Technicon Instruments Corporation, New York, USA. 

The carbon source should be inexpensive because it is the major contributor to the total substrate cost (up to 50% of the total operating cost) (13). The ratios of the C and N contents of the hydrolyzed malt and soy wastes were 9 1 and 7.5 1, respectively, as determined by total organic carbon (4) and total Kjeldahl nitrogen (TKN) (4). 

The term biomass will be neglected in later reactions, since all biochemical reactions require and produce biomass. Temperature, pH, dissolved oxygen, and the ratio of BOD to total Kjeldahl nitrogen (TKN) are important factors in nitrification. 

From the Chapter Resources menu, choose Web Works. Locate the Chapter 16 section, and click on the link to the executive summary of the Lake Champlain Basin Agricultural Watersheds Project. The report summarizes a project to improve water quality in Lake Champlain in Vermont and New York. Based on your reading of the report, what appears to be the primary general cause of the eutrophication of Lake Champlain What types of industry are the sources of the pollution What measures have been taken to reduce the pollution Briefly describe the experimental design to determine whether these measures have been effective. Total Kjeldahl nitrogen (TPCN) determinations were one of the quantities measured in this study name three others. Explain how TKN provides a measure of pollution in the lake. Based on the TKN measurements and other data in the report, have the pollution abatement measures been effective What are the final recommendations of the report ... 

The use of microwaves in the acceleration of digestion and colour development in the determination of total Kjeldahl nitrogen in soil has been examined [1]. Visual method based on the colour development of indothymol blue formed between ammonia and thymol has recently been developed for the determination of ammonia-nitrogen in environmental waters [2]. UV photo-oxidation of reduced forms of nitrogen to nitrate by peroxodisulfate can make a basis for the determination of total nitrogen in urban and industrial waste waters [3]. 

The total nitrogen content is used to characterize numerous products and samples in the petrol, paper and carbon industries. These measurements can be carried out with CHN analysers as described previously, but to simplify the procedure, customized analysers have been developed for this single element. They are an alternative for cumbersome reference methods, such as total Kjeldahl nitrogen (TKN - corresponds to the sum of organic nitrogen and ammonia). 

The wastewater from syntheses of chloro- -trlazlne herbicides Is a clear, colourless mixture of wastes from the chemical reaction and from washing the product. It has a total organic carbon content of about 1200 mg a total Kjeldahl nitrogen concentration of about 810 mg of N a biological oxygen demand after 5 days of about 530 mg of O2 L, and contains NaCl at about 35 g L the pH Is about 12 (14). 

TKN total Kjeldahl nitrogen NH3 — N ammonia nitrogen T — PO4 — P total phosphate phosphorous. 

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