loading

 Expert in Water Quality Measurement and Water Treatment Project Since 2007

About the Method Principle of Determination of BOD by Dilution Inoculation Method

Biochemical oxygen demand refers to the amount of dissolved oxygen consumed by microorganisms in the biochemical process of decomposing certain oxidizable substances in water, especially organic matter, under specified conditions. The whole process of biooxidation takes a long time. For example, when cultured at 20°C, it takes more than 100 days to complete this process. At present, it is generally stipulated at home and abroad to culture at 20 ℃ ± 1 ℃ for 5 days, and measure the dissolved oxygen of the samples before and after the culture respectively. The difference between the two is the BOD5 value, expressed in mg/L of oxygen. For some surface water and most industrial wastewater, because they contain more organic matter, they need to be diluted and then cultivated for measurement to reduce their concentration and ensure sufficient dissolved oxygen. The degree of dilution should be such that the dissolved oxygen consumed in the culture is greater than 2 mg/L, while the remaining dissolved oxygen is above 1 mg/L. In order to ensure sufficient dissolved oxygen after water sample dilution, the dilution water is usually aerated with air (or oxygen) to make the dissolved oxygen in the dilution water close to saturation. A certain amount of inorganic nutrient salts and buffer substances (calcium phosphate, magnesium and iron salts, etc.) should also be added to the dilution water to ensure the growth of microorganisms. For industrial wastewater containing no or little microorganisms, including acidic wastewater, alkaline wastewater, high-temperature wastewater or chlorinated wastewater, inoculation should be carried out when measuring BOD to introduce microorganisms that can decompose organic matter in wastewater. When there are organic substances in the wastewater that are difficult to be degraded by microorganisms in general domestic sewage at a normal speed or contain highly toxic substances, the domesticated microorganisms should be introduced into the water sample for inoculation.

Shanghai Boqu Instrument Co., Ltd. has an array of branches in domestic for munufacturing water analyzer.

Shanghai Boqu Instrument Co., Ltd. is a company that offers reliable products. For customization, water quality monitoring device and water quality monitoring device in different styles are also in the offer list. Click BOQU Water Quality Analyzer for more details.

By building an connection around BOQU and catering specifically to the craft beer crowd, Shanghai Boqu Instrument Co., Ltd. was able to raise the capital and brand awareness needed to successfully break into the domestic market with a groundswell of support.

The trend toward using water quality monitoring device water analyzer to ease water quality monitoring device, once established, soon extended into such additional fields as water quality monitoring device and water quality monitoring device.

We utilize our expertise to develop services that add value at each phase of thewater analyzer development cycle. We evaluate and implement new strategies in response to changing customer profiles and market conditions.

GET IN TOUCH WITH Us
recommended articles
knowledge Project Info Center
Water is one of the most precious resources on our planet, and it is essential that we manage it in a sustainable and responsible way.
Turbidity Meters: Essential Tools for Civil Engineers

Civil engineers play a crucial role in ensuring the safety and functionality of various infrastructure projects, including water treatment plants, construction sites, and environmental monitoring.
Employee training is an essential aspect of any business, especially when it comes to using specialized equipment such as turbidity meters.
While turbidity meters may not be the most glamorous piece of equipment in a research laboratory, their importance cannot be overstated.
Turbidity meters play a crucial role in ecosystem monitoring as they provide valuable data on water quality and the overall health of aquatic environments.
Today, turbidity meters are playing a crucial role in bridging the gap between scientific research and policy-making.
Turbidity meters are important tools used in various industries to measure the clarity of a liquid.
What is an ORP Meter? Understanding Oxidation-Reduction Potential

An ORP meter is a tool used to measure the Oxidation-Reduction Potential (ORP) of a liquid.
ORP (Oxidation-Reduction Potential) meters are essential tools for measuring the oxidation potential of a solution.
Innovations in Turbidity Meter Technology: What’s New?

Turbidity meters are essential devices used to measure the cloudiness or haziness of a fluid caused by large numbers of individual particles that are invisible to the naked eye.
no data

Contact Us

Contact Person:Michael Luo
E-MAIL:michael@shboqu.com
Tel:86-021-20965230
Fax:86-021-20981909
Skype:+86-15000087545
Whatsapp:86-15000087545
Office Add:No. 118 Xiuyan Road,Pudong New Area,Shanghai,Zip Code:201315,China

Contact us right away

BOQU Instrument focus on development and production of water quality analyzers and sensors, including water quality meter, dissolved oxygen meter, pH sensors, etc.

Copyright © 2024 Shanghai BOQU Instrument Co.,Ltd | Sitemap
Customer service
detect