5 Simple Statements About BOD testing Explained
5 Simple Statements About BOD testing Explained
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Combined with the potassium dichromate in fifty% sulfuric acid Alternative, pre-organized COD vials also contain silver sulfate as being a catalyst and mercuric sulfate to get rid of chloride interference. So, COD vials are viewed as harmful squander and have to be managed and disposed of within an accepted manner.
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Substantial concentrations of organics can deplete dissolved oxygen stages in h2o, bringing about damaging environmental and regulatory consequences.
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Divide the COD concentration with the BOD focus for every sample and average the effects. As an example, underneath could be the COD:BOD ratio formulated utilizing three wastewater samples from the meals processor:
The COD test uses a chemical (potassium dichromate within check here a fifty% sulfuric acid Option) that “oxidizes” equally organic (predominate) and inorganic substances in the wastewater sample, which leads to a greater COD concentration than BOD concentration for the same wastewater sample due to the fact only organic compounds are consumed all through BOD testing.
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เนื่องจากการทดสอบค่าบีโอดีนี้ เกี่ยวข้องกับจุลินทรีย์ในน้ำ จึงจำเป็นต้องทำให้น้ำ มีสภาพที่เหมาะสม สำหรับการเจริญเติบโตของจุลินทรีย์ คือ ไม่มีสารพิษ แต่มีอาหารเสริมเพียงพอสำหรับจุลินทรีย์ เช่น ไนโตรเจน ฟอสฟอรัส
BOD is proven around the theory that microorganisms keep consuming oxygen to decompose natural squander till enough time it doesn't get dissipated.
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A defined microbial consortium can be fashioned by conducting a systematic analyze, i.e. pre-testing of picked micro-organisms for use being a seeding materials in BOD Investigation of lots of industrial effluents. This kind of formulated consortium might be immobilized on suited membrane, i.e. billed nylon membrane. Billed nylon membrane is well suited for microbial immobilization, because of the specific binding between negatively billed bacterial cell and positively billed nylon membrane.
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