| Landscape water is urban habitat’s important constituent, and has the important aestheticvalue, economic significance and ecological function. It usually include residential area ofwater, artificial lake park, urban small river, etc.This subject separately studied the contamination removal efficiency of biological contactoxidation pool and biological aerated filters film stage in operational stable which is relyingon a residential area of Shanghai landscape supply water due to the water quality is bad forthe natural river water raw water. The subject also discusses the main influence factors ofbiological contact oxidation pool and biological aerated filters processing efficiency.Biological contact oxidation and biological aerated filters are used to hang the intermittentnature membrane hang film way to polluted river water for natural raw water hangingmembrane, biological contact oxidation and biological aerated filters hang the membrane timefor 32 d respectively and 25 d; During the running of biological contact oxidation pool ofammonia nitrogen removal of 70%, can be as high as 96.59%; The highest removal rate ofCOD is 85.71%; Biological contact oxidation air flotation process-the total phosphorus fell to0.05 mg/L the following, the removal rate of 90%; Effluent turbidity is 10 degrees or so, onaverage, 85% removal rate, and the effluent water quality is good, can reach the surface waterenvironment quality standards (GB 3838-2002) IV class water standards; Biological aeratedfilters water concentration of COD an average of 15 mg/L; Ammonia nitrogen density isstable for 0.5 mg/L or so, ammonia nitrogen removal average is 90%; Turbidity 8 degrees orso, removal rate averaged 85%, can achieve the law of the People’s Republic of waterlandscape entertainment water quality standard of (GB12941-91) C water standard, but needto be complementary with chemical method of total phosphorus removal raw water;Trial to affect biological contact oxidation ponds and biological aerated filters treatmenteffect factors are analyzed, and the results show that the increase of the hydraulic loading ofbiological contact oxidation pool has a certain impact, but in 2 ~ 3 d can be recovered towithin normal level, to explain the biological film adhesion packing surface is stronger, the hydraulic load changes adaptability is strong; Ammonia nitrogen removal concentrated in thefilter material height is 30 ~ 90 cm section, COD removal is concentrated in 0 ~ 60 cm section;Reverse wash water by gas joint kicks back way: separate qi chong 1 min; Water and airrecoil 3 min; Separate water rushed 5 min. Reverse wash after ammonia nitrogen and CODremoval of all appeared of the short time to drop, but were soon return to normal levels. |
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