What are the main reasons for the harm to the environment caused by sludge from sewage treatment?
What are the main reasons for the harm to the environment caused by sludge from sewage treatment? Author: post-industrial waste water treatment will have a lot of sludge, and the sludge will cause harm to the environment, the following small series to tell you about the post-industrial wastewater treatment sludge mainly due to harm to the environment what. 1. Problems that may be caused by salt The salt in the sludge will directly affect the electrical conductivity of the soil, destroy the nutrient balance of the plant, inhibit the absorption of nutrients by the plant, and even cause direct damage to the root system of the plant, resulting in plant death, and the salt separation Antagonism will accelerate the leaching of effective nutrients in the soil, destroy the soil nutrient balance, and make the soil compact and barren. 2. Problems that may be caused by pathogenic microorganisms. Urban sewage treatment plant sludge that has not been treated by medium (high) temperature digestion or other disinfection methods contains a large number of bacteria, viruses, parasite eggs, etc., and each gram of sludge contains hundreds of millions Coli, dysentery, bacteriophages, parasite eggs, roundworms or enteroviruses and other microorganisms. The toxic and harmful microorganisms in the sludge should not be ignored. The sludge must be treated in a harmless manner to prevent it from entering the food chain and causing harm to human and animal health. 3. Problems that may be caused by nutrients such as N and P. The sludge is rich in elements such as N and P. Elements such as N and P are nutrients necessary for plant growth. If a large amount of N and P elements enter closed or semi-enclosed water bodies such as lakes, reservoirs and bays, as well as some stagnant (flow rate <1 m/min) river water bodies , Will cause its eutrophication, make some algae and other plankton rapidly multiply, reduce the transparency of the water body, reduce the dissolved oxygen content of the water body, cause a large number of aquatic organisms to die, deteriorate the water quality, and cause environmental pollution. 4. Problems that may be caused by organic pollutants. The organic matter in the sludge includes protein, benzene, chlorophenols, and polychlorinated dibenzodioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) (collectively called dioxins). ), among which dioxins/furans (PCDD/Fs) are a type of polychlorinated tricyclic aromatic compounds with 210 isomers, which have become the most concerned and most toxic in the world, and are proposed in the Stockholm International Convention Persistent organic pollutants (POPs) that need to be eliminated. Therefore, organic pollutants, especially dioxins, are harmful to the environment and humans caused by sludge farmland utilization. 5. Problems that may be caused by heavy metals Heavy metals in sludge include Cr, Cu, Zn, Mn, Hg, Cd, Ni and other metal substances with large atomic weight, and Pb, Al, Sb and other substances that are seriously harmful to the human body. The current pretreatment of heavy metals in sludge can temporarily reduce their environmental hazards, but it cannot be ruled out that substances in the external environment will react with them to restore their toxicity and cause secondary pollution. The above is the editor's introduction to the main reasons for the harm to the environment caused by sludge after industrial sewage treatment. There are many harms of sludge, so we must pay attention to the treatment of sludge.
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