Oxygen flow meter for sale | BOD and COD indicators in water environment monitoring | Coral mass flow meter | biogas flow meter for agricultural digester

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1. Chemical Engineering English Translation

Annealing at 800? Under a nitrogen atmosphere, a yellow colored powder is obtained as an intermediate product of BNO, which may have the following formula B4N3O2H [11a]. The yellow powder was further calibrated in air at 600 ° C for 2 hours to obtain more oxygen in the white BNO product. The prepared British National (Overseas) precursor is put into a large graphite crucible. Aluminum chloride is placed in a small BN crucible above the crucible. These components are enclosed in graphite suspension receptors and heated in an induction furnace. Then evacuate the furnace and introduce a pure Ar gas stream. Heating the furnace step by step. When the gas flow rate at a temperature of about 950 ℃ C is switched to: pure NH3/N2 (N2 100 mL/min ± 1, ammonia nitrogen 200 mL/min ± 1). Afterwards, raise the temperature and maintain it at 1200 C for approximately 1.2 hours. Then increase the temperature further. Adjustment of position sensor for British National (Overseas) precursor in large graphite crucible to ensure heating of BNO precursor mixture at C. 1600? The atmosphere is that the flow of N2/NH3 has the same velocity, as in the first stage. After about an hour of coaxial tubular single crystalline cubic aluminum nitride nanotubes and a BN coating. The X-ray diffractometer (2200HF RINT) and high-resolution transmission field emission electron microscope (HRTEM) (JEM-3000F) on this product are connected to an X-ray energy dispersive spectrometer (EDS).

2. BOD and COD indicators in water environment monitoring

Chemical oxygen demand COD and biological oxygen demand BOD are the most important indicators in water environment monitoring, mainly characterizing the

oxygen flow meter for sale|coriolis mass flow meter

amount of reducing pollutants in water.

Due to the wide variety of organic compounds, it is impossible to measure their respective contents, so BOD and COD are commonly used as comprehensive indicators. The decomposition of organic matter in water is carried out in two stages. The first stage is the carbon oxidation stage, and the second stage is the nitrification stage. The amount of oxidation consumed in the carbon oxidation stage becomes the carbonation biochemical oxygen demand (CBOD). Hydrocarbons, proteins, oils, lignin, and other organic pollutants that exist in suspended or dissolved states in domestic sewage and industrial wastewater such as sugar, food, paper, and fiber are all organic pollutants that can be decomposed by aerobic bacteria through biochemical reactions. Due to the consumption of oxygen during the decomposition process, they are also known as aerobic pollutants. If too much of these pollutants are discharged into water bodies, it will cause a lack of dissolved oxygen in the water. At the same time, organic matter will also cause decay through the decomposition of anaerobic bacteria in the water, producing odorous gases such as methane, hydrogen sulfide, thiols, and ammonia, causing the water to deteriorate and become foul smelling. Organic matter is basically a reducing substance that can be oxidized by chemical oxidants. The more organic matter there is, the more oxidants are consumed, so the amount of oxidants consumed (converted to mg/L of O2) can indirectly reflect the content of organic matter. But not all organic compounds can be oxidized, such as lower fatty acids mainly composed of acetic acid, which can hardly be oxidized. In addition, oxidized pollutants also include reducing inorg

Oxygen flow meter for sale | BOD and COD indicators in water environment monitoring | Coral mass flow meter

1. Chemical Engineering English Translation

2. BOD and COD indicators in water environment monitoring

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