Oxygen is the life element of aquatic organisms. The growth of aquatic animals slowed down after long-term hypoxia; In severe hypoxia, fish and shrimp will float their heads, and aquatic H2S, NH3, NO2, etc. can not be oxidized and decomposed, resulting in increased toxicity. Keep enough dissolved oxygen to decompose and transform toxic substances.

According to the requirements of process operation, we do the following network system design: the network adopts RS485 bus design. Each 5 sheds are one network node. All sensors are 485 bus, and finally, data of 

Heavy metals include Hg, Cr, Cr (VI), Cu, Pb, Zn, CD and Ni, etc. the specific monitoring indexes shall be determined by the administrative department of environmental protection at or above the county level.

There are many metallurgical industrial products, and the production processes are in series. A large amount of wastewater is discharged, which is one of the main wastewater that pollutes the environment. Circulating water is an important measure for metallurgical wastewater treatment. Develop and adopt new processes and technologies with little or no water use and with no or little pollution. Develop comprehensive utilization, recover useful materials and heat energy from waste water and waste gas, and reduce the loss of materials and fuel.

Most of the exhaust gases are VOCs with strong diffusion, low olfactory value and wide range of influence.

The wastewater is mainly produced by material preparation, cooking, bleaching, evaporation and other sections. The main pollutants are chemical oxygen demand (CODcr), five-day biochemical oxygen demand (BOD5), suspended solids (SS) and ammonia nitrogen. The concentration of pollutants: CODcr 1200 ~ 2500 mg / L, BOD5 350 ~ 800 mg / L, SS 250 ~ 1500 mg / L, ammonia nitrogen   2~5 mg/L。

Food safety is a systematic project, which involves policy, regulation, technology, equipment, process, circulation, management and other links. That is to say, it is a long and complex food chain system from farmland to dining table

Water pollution sources include industrial waste water sources and domestic sewage water sources. Before formulating the monitoring plan, it is necessary to carry out investigation and research, collect relevant data, and find out the water consumption, types of wastewater or sewage, main pollutants, discharge direction and discharge amount, the number and location of sewage outlets in workshops, factories or areas, wastewater treatment, whether it is discharged into rivers, lakes and seas, and whether there are seepage pits in the flow area. Then, comprehensive analysis is carried out to determine the monitoring items, monitoring points, sampling time and frequency, sampling and monitoring methods and techniques, and formulate quality assurance procedures, measures and implementation plans.

Water quality information to be monitored includes water temperature, pH, dissolved oxygen (do), conductivity and turbidity.

The basic items of surface water environmental quality standards are applicable to the surface water areas with use functions such as rivers, lakes, canals, channels and reservoirs.

The water stored in the soil and rock voids (pores, fissures, solution gaps) is collectively referred to as groundwater. Compared with surface water, the change of groundwater flow and water quality parameters is relatively slow.

The modern laboratory can realize seamless connection with computers, use the core computer to calculate the test results, and show the seamless connection of data. The laboratory equipment in Colleges and universities is the progress of modern science and technology, and also the promoter of the times. The importance of test data and analysis results accelerates the power of modern science and technology, and promotes the development of colleges and universities, It has realized the modern laboratory of University.