{"id":14056,"date":"2022-05-30T15:12:11","date_gmt":"2022-05-30T07:12:11","guid":{"rendered":"https:\/\/www.rocker.com.tw\/?post_type=application&p=14056"},"modified":"2026-04-21T10:31:23","modified_gmt":"2026-04-21T02:31:23","slug":"wastewater-quality-tests","status":"publish","type":"application","link":"https:\/\/www.rocker.com.tw\/en\/application\/wastewater-quality-tests\/","title":{"rendered":"Wastewater Testing"},"content":{"rendered":"
Content<\/strong><\/span>
\nWastewater definition & indicators<\/a>
\nCOD Test (Chemical Oxygen Demand)<\/a>
\nDetermination of Total Ammonia Nitrogen (TAN)<\/a>
\nDetermination of Total Phosphorus (TP)<\/a>
\nDetermination of Total Nitrogen (TN) <\/a><\/div>\n

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<\/a>Wastewater definition & indicators<\/h2>\n

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Wastewater is used water that has been affected by domestic, industrial and commercial use. The composition of wastewater normally is 99.9% water and the remaining 0.1% is what is removed. This 0.1% may contain organic matter, microorganisms and inorganic compounds. Wastewater effluents are released to a variety of environments, such as lakes, ponds, streams, rivers, estuaries and oceans. Wastewater also includes storm runoff, as harmful substances wash off roads, parking lots and rooftops.<\/p>\n

There are physical, chemical and biological indicators that may affect wastewater quality, includes temperature, total suspended solids (TSS), pH value, oxygen and oxygen demand, nitrogen, phosphorus, chlorine and micro-organisms. In this assay, we’ll discuss more about the chemical indicators of wastewater quality including oxygen demand, total ammonia nitrogen, total phosphate and total nitrogen.<\/p>\n

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Read more about:
\nTotal Suspended Solids Test<\/a>
\nMicrobiological Test<\/a><\/p>\n<\/blockquote>\n

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<\/a>Chemical Oxygen Demand (COD) Test<\/h2>\n

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Chemical oxygen demand (COD) is a method to determine the quantity of pollution in water. The higher value of chemical oxygen demand indicates the higher organic pollution in the water sample. As compared to Biological Oxygen demand test, COD takes less time to process, thus is recommended where the water has toxicity and organic matter that cannot be determined by biological oxygen demand.\u00a0<\/p>\n

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Steps of COD Tests<\/h3>\n

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  1. Select the appropriate concentration of reagent vial according to the COD concentration of sample.<\/li>\n
  2. Add 2 mL pure water to one COD reagent vial as the blank sample.<\/li>\n
  3. Add 2 mL test sample to another COD reagent vial as the test sample.<\/li>\n
  4. Tighten the cap and shake slightly to mix evenly.<\/li>\n
  5. Put the vials into the COD reactor (CR 25), start COD program for 150 oC, 2 hours.<\/li>\n
  6. Remove the vials and cool them down to room temperature.<\/li>\n
  7. Turn on the COD detector (CD 200) and insert the blank sample vial into it to start a zero calibration.<\/li>\n
  8. Insert the test sample vial into the COD detector (CD 200) to get the COD concentration of the sample.<\/li>\n<\/ol>\n

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