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◉ Introduction to Bottom Sludge Testing
bottom sludge refers to the bottom sludge deposited on the bottom of the water under the action of water body transport after a long period of physical, chemical and biological action of clay, silt, organic matter and various minerals. The bottom sludge with a thickness of 0 to 15 cm on the surface is called surface bottom sludge, and the bottom sludge more than 15 cm is called deep bottom sludge.
bottom sludge testing is to sample and test the bottom sludge to determine the type and concentration of pollutants in the bottom sludge.
◉ Scope of Test
bottom sludge/silt in rivers, rivers, lakes, black and odorous water bodies, etc., including:
(1) Detection of bottom sludge pollution;
(2) Investigation and testing of the current situation of endogenous pollution, etc.
◉ Harm
bottom sludge is the bottom sludge of rivers and lakes and is an important part of natural waters. When the water area is polluted, some pollutants in the water can be stored in the bottom sludge through precipitation or particle adsorption, and then released again under appropriate conditions, becoming a secondary pollution source. This kind of pollution is called bottom sludge pollution. In the process of pollution control of rivers and lakes, the control of bottom sludge pollution is one of the main difficulties, and it is also a relatively common environmental problem at present. There is a dynamic balance of absorption and release between the water body and the bottom sludge. When the water body is seriously polluted, some pollutants can enter the bottom sludge through precipitation, adsorption, etc.; when the pollution caused by external sources is controlled, the accumulation Various organic and inorganic pollutants in the bottom sludge re-enter the overlying water through the physical, chemical and biological exchange with the overlying water, becoming a secondary pollution source that affects the water quality.
The existence of bottom sludge is polluted by nutrients, which can change the survival and growth of farmed fish. In mild cases, it can lead to slow growth of cultured organisms and cause various diseases. In severe cases, it will cause fish poisoning and death, resulting in eutrophication of water bodies. . The organic pollution in the bottom sludge will cause the biological oxidative decomposition, which needs to consume the dissolved oxygen in the water and lead to the lack of oxygen in the water. At the same time, corruption and fermentation will occur, causing bacteria to grow, deteriorating water quality, and destroying water bodies. The organic pollution of industrial water will also reduce the quality of products.
In addition, there is a lot of heavy metal pollution in the bottom sludge. These heavy metal pollution will not only harm the aquatic ecosystem and have various harmful effects on aquatic organisms, but also directly or indirectly affect human health through drinking water and food chains. Especially in the process of industrial wastewater discharge, a considerable degree of heavy metal elements are deposited in natural water bodies. Therefore, in many factories and enterprises, wastewater testing or bottom sludge testing will be performed accordingly to check whether the substance content meets the standard.
◉ Test Items
Total Cadmium, Total Mercury, Total Lead, Total Chromium, Hexavalent Chromium, Total Arsenic, Total Nickel, Total Zinc, Total Copper, Total Boron, Mineral Oil, Fluoride (as Fluorine), Cyanide (as CN), Total phosphorus, total nitrogen, particle size, organic matter, volatile organic compounds 27 items (including: carbon tetrachloride, chloroform, methyl chloride, 1,1-dichloroethane, 1,2-dichloroethane, 1,1 -dichloroethylene, cis-1,2-dichloroethylene, trans-1,2-dichloroethylene, dichloromethane, 1,2-dichloropropane, 1,1,1,2-tetrachloroethane, 1,1,2,2-tetrachloroethane, tetrachloroethylene, 1,1,1-trichloroethane, 1,1,2-trichloroethane, trichloroethylene, 1,2,3-trichloroethane Chloropropane, vinyl chloride, benzene, chlorobenzene, 1,2-dichlorobenzene, 1,4-dichlorobenzene, ethylbenzene, styrene, toluene, m-xylene + p-xylene, o-xylene), semi-volatile 11 items of sexual organic matter (nitrobenzene, aniline, 2-chlorophenol, benzo[a]anthracene, benzo[a]pyrene, benzo[b]fluoranthene, benzo[K]fluoranthene, chrysene, diphenylene) [a, h]anthracene, indeno[1,2,3-cd]pyrene, naphthalene), pH, moisture content, coliform-like bacteria value, etc.
◉ Related Standards
"Technical Specifications for Soil Environmental Monitoring" HJ/T 166-2004
"Soil Environmental Quality Construction Land Soil Pollution Risk Control Standards" GB 36600-2018
"Technical Guidelines for Environmental Dredging Engineering of Lakes and Rivers"
◉ Compliance Services
As a professional third-party testing and certification service organization, Jiayu Testing has qualifications such as CMA, CNAS, and occupational health technical service institutions. In the field of environmental testing, it currently has more than 1000 CMA testing parameters, covering water and wastewater, air and exhaust gas, soil and sediment, noise and vibration, and solid waste toxicity identification. The laboratory is built and managed strictly in accordance with standards, equipped with advanced instruments and equipment, and has a professional technical team with superb skills. It has rich industry service experience and strong testing technology capabilities. Based on the principles of objectivity and fairness, it provides authoritative testing reports with legal effect to the society, and provides full chain environmental risk management support for enterprises and regulatory departments. Welcome to contact us at 400-9269-886!
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