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What is the role of the filter used to raise goldfish? The water in the fish tank will be contaminated by fish feces, food residues, aquatic leaves.In people's imagination, the suspended matter visible in the water is filtered out,The purpose of keeping the water clear and transparent has been achieved,In fact, this is only the primary function of filtering,We usually call it mechanical filtration.The modern ornamental fish tank filtration should have mechanical filtration at the same time,It also has the function of biological filtration,Physical filtering is also needed sometimes.One of the most important is biological filtration.The so-called biological filtration,It is through bacteria attached to the filter material,Decompose or convert harmful substances dissolved in water into harmless substances.Physical filtration is to use the unique adsorption function of some materials to make water purification.Physical filtering is used for a short time under special circumstances,For example, in order to remov
Problem of sewage treatment I feel that this problem is very wide,Not very good answer.Say your own point of view 1. the process you said is equivalent to anaerobic-The process of combining good oxygen,The effect of nitrogen and phosphorus removal, discoloration and COD removal was significant.2. the general phosphorus removal process is basically in the anaerobic stage,The phosphate plasma produced after the decomposition of organic matter,By absorbing phosphorus elements such as polyphosphorus bacteria,Then add CaOH2,Calcium phosphate precipitation produced,Thus remove.3. the nitrogen removal process is also in the anaerobic stage,Organic matter converts nitrate nitrogen into N2 removal through the process of denitration.This is the general principle.4. the aerobic stage in the later stage,Mainly to remove COD,The organic matter in the early anaerobic stage was transformed into small molecules such as carbon dioxide and water after being metabolized by aerobic microorganisms.5. microbial condition:
