2020-11-24

The current "Health Standards for Drinking Water" (GB5749-2006) stipulates strict hygiene requirements for drinking water quality, namely: ①Good sensory properties: transparent, colorless, no peculiar smell and odor, and no visible objects; ② Epidemiologically safe: it does not contain pathogenic microorganisms and parasite eggs; ③The chemical composition is harmless to humans: the chemical substances contained in the water do not cause acute, chronic and long-term harm to the human body.

2020-11-24

Ground water refers to the water that occurs in the rock voids below the ground, and in a narrow sense refers to the water in the saturated aquifer below the ground water surface. In the national standard "Hydrogeology Terminology" (GB/T 14157-93), groundwater refers to various forms of gravity water buried below the surface. Foreign scholars believe that there are three definitions of groundwater: one refers to all the water buried in groundwater that is significantly different from surface water, especially the part of the water in the saturated zone in the aquifer; the other refers to downward flow or penetration to make soil and rocks It is saturated and replenishes the water of springs and wells; the third is the water stored in the rock cavities underground and in the voids that make up the crustal material. Groundwater is an important part of water resources. Because of its stable water volume and good water quality, it is one of the important water sources for agricultural irri

2020-11-24

Domestic sewage is the waste water discharged in the daily life of residents. It mainly comes from residential buildings and public buildings, such as houses, offices, schools, hospitals, shops, public places and industrial enterprises toilets. The pollutants contained in domestic sewage are mainly organic matter (such as protein, carbohydrate, fat, urea, ammonia nitrogen, etc.) and a large number of pathogenic microorganisms (such as parasite eggs and intestinal infectious virus, etc.). The organic matter in domestic sewage is extremely unstable and easily decomposes to produce foul smell. Bacteria and pathogens multiply by taking organic matter in domestic sewage as nutrients, which can lead to the spread of infectious diseases. Therefore, domestic sewage must be treated before it is discharged. In the process of sewage treatment, firstly it is necessary to detect and analyze the quality of sewage, mainly by detecting the data of SS, COD, BOD, etc. in the water.

2020-11-24

Industrial waste gas detection refers to the general term for the detection of various pollutant-containing gases discharged into the air during the fuel combustion and production processes in the factory area. Industrial waste gas detection includes organic waste gas detection and inorganic waste gas detection. Organic waste gas mainly includes various hydrocarbons, alcohols, aldehydes, acids, ketones and amines; inorganic waste gas mainly includes sulfur oxides, nitrogen oxides, carbon oxides, halogens and their compounds. Industrial waste gas has different treatment methods according to its exhaust air volume, temperature, concentration and its own chemical and physical properties. Industrial waste gas is an important source of air pollutants. A large amount of industrial waste gas is discharged into the atmosphere, which will inevitably reduce the quality of the atmospheric environment, bring serious harm to human health, and cause huge losses to the national economy. After harmful

2020-11-24

All sounds that hinder people's normal rest, study and work, as well as sounds that interfere with the sounds people want to hear, are all noise. In this sense, there are many sources of noise, such as the sound of cars on the street, the sound of talking in a quiet library, the sound of machinery on construction sites, and the excessively loud sound of neighboring TV sets. Noise is a kind of physical pollution. It refers to the unwanted and annoying sound of people. It is considered to be the third largest public hazard after air pollution and water pollution, and causes great harm to human health. Test items: 1. Environmental noise (regional environmental noise, road traffic noise) 2. Industrial enterprise plant boundary noise 3. Social life environmental noise 4. Construction site boundary noise 5. Workplace noise, vibration

2020-11-24

Working principle The liquid resistance detection method is to fill the oil and gas recovery pipeline with nitrogen at the specified nitrogen flow rate, and simulate the oil and gas passing through the oil and gas recovery pipeline. Use a pressure gauge or equivalent device to detect the liquid resistance of the gas passing through the pipeline to understand the degree of resistance to the gas caused by various reasons in the pipe to determine whether it affects the oil and gas recovery. The airtightness detection method uses nitrogen to pressurize the vapor recovery system to 500 Pa, allowing the system pressure to decay. The residual pressure value after 5 minutes of detection is compared with the minimum residual pressure limit specified in Table 2. If it is lower than the limit, it indicates that the leakage degree of the system exceeds the allowable range. The gas-liquid ratio detection method is to install a tight adapter at the nozzle of the fueling gun. The adapter is connected

2020-11-24

Bottom mud is usually a mixture of clay, silt, organic matter, and various minerals. It is formed by depositing at the bottom of the water body after a long time of physical, chemical, and biological action and water transmission. The sediment with a thickness of 0 to 15 cm on the surface is called surface sediment, and the sediment with a thickness of more than 15 cm is called deep sediment. Bottom mud is the sediment of rivers and lakes and an important part of natural waters. When the water area is polluted, part of the pollutants in the water can be stored in the bottom sludge through precipitation or particulate matter adsorption, and then released under appropriate conditions to become a source of secondary pollution. This type of pollution is called bottom sludge pollution. Test items: mercury, lead, cadmium, copper, zinc, chromium, nickel, arsenic and other heavy metals or inorganic non-metallic toxic substances, total nitrogen, total phosphorus, PH, moisture content, organic m

2020-11-24

Soil monitoring is basically the same as water quality and atmospheric monitoring. The various physical and chemical properties of the soil are measured by appropriate measurement methods, such as iron, manganese, total potassium, organic matter, total nitrogen, available phosphorus, total phosphorus, moisture, total arsenic, available boron, Fluoride, chloride, mineral oil and total salt content, etc., to achieve the purpose of monitoring the status of soil quality; monitoring of soil pollution accidents; dynamic monitoring of pollutant land treatment; soil background value investigation. my country's "Soil Environmental Quality Standard" stipulates that 11 items of heavy metals, pesticides and pH are monitored. The "Technical Specifications for Monitoring Farmland Soil Environmental Quality" divides soil monitoring projects into three categories: mandatory testing items, selection mandatory testing items, and selection items. Select required test items and selected test items include

2020-11-24

The "Law of the People's Republic of China on Soil Prevention and Control" was promulgated on August 31, 2018 and officially implemented on January 1, 2019. my country's soil prevention and control has ushered in a new situation, and local environmental protection regulatory agencies will continue to strengthen in accordance with the requirements of regulations Supervise soil pollution sources and establish a soil environmental monitoring system for enterprise land. Environmental investigations on soil sites have become a key task for soil prevention and control in various regions. Service Scope: Farmland soil environment inspection, soil environment inspection for construction projects, regional soil background value investigation, site investigation.

2020-11-24

Solid waste: refers to the solid and muddy waste discharged into the environment by people during development, construction, production and operation, and daily life activities. According to different classification standards: 1. Chemical properties: inorganic, organic 2. Shape: solid, muddy 3. Hazard: general, toxic (dangerous) 4. Source: industrial, mining, municipal waste, agricultural solid waste monitoring Solid waste monitoring It is the process of monitoring and measuring solid waste. Solid waste refers to solid and semi-solid wastes that pollute the environment generated in production, construction, daily life and other activities. Industrial solid waste refers to solid waste generated in production activities such as industry and transportation. Urban domestic waste refers to the solid waste generated in urban daily life or activities that provide services for urban daily life, as well as laws and administrative regulations.

2020-11-24

Radioactive pollution refers to the occurrence of radioactive substances or rays that exceed national standards on the surface or inside of materials, human bodies, places, and environmental media due to human activities. The harm of radioactivity to biology is very serious. Radiation injury has acute injury and chronic injury. If people are exposed to large doses of X-rays, gamma rays and neutrons in a short period of time, they will cause acute injury. Mild cases have symptoms such as hair loss and infection. When the dose is larger, gastrointestinal damage such as diarrhea and vomiting may occur. Under extremely high doses of radiation, central nervous system damage occurs until death. For the central nervous system, the main symptoms include weakness, fatigue, lack of desire, collapse, lethargy, etc. In severe cases, the whole body muscles tremble and cause epileptiform spasm. The small intestine with vigorous cell division is highly sensitive to ionizing radiation.

2020-11-24

Environmental Impact Assessment Environmental impact assessment refers to the analysis, prediction and assessment of the possible environmental impacts after the implementation of planning and construction projects, proposes countermeasures and measures to prevent or reduce adverse environmental impacts, and methods and systems for tracking and monitoring. The purpose is to implement sustainable development strategies, prevent adverse effects on the environment after the implementation of planning and construction projects, and promote the coordinated development of economy, society and the environment. Environmental Impact Assessment Report Form Service Process: Environmental Impact Assessment Report Preparation Process: Environmental Supervision Environmental supervision means that the environmental supervision agency is entrusted by the project construction unit, based on the environmental impact assessment documents, the environmental protection administrative department’s approva