Comparative Analysis On The Effects Of Microorganism And Plant Residues On The Purification Of Black Odorous Water Under Inflated Aeration Condition

Black odorous water black odor is an extreme phenomenon of organic water body pollution,which happens under extreme pollution state of water body.It is a serious threat to the lake's own ecosystem health and drinking water safety of the surrounding residents.The problem of black odorous water has become an urgent problem to be solved.It is very important to find a simple and effective treatment plan for the management of black odrouswater and the maintenance of healthy ecosystem.The methods of water restoration are generally divided into physical,chemical and biological-ecological technology.Artificial aeration is a physical method which is flexible and has been applied in many practical ways;The chemical methods are generally used as emergency measures;The core in biological-ecological technology is microbial decomposition or transfer of nutrient through aquatic plant growth.But,predecessors more concentrated in positive effect of microorganisms and aquatic plants produced in the water,and researched inadequately on the instabile microbial effects and non-physical method to deal with aquatic plant residues.We studied the effects of adding plant residues(Phragmites australis),microorganisms and inflated aeration on black odorous water(TN:21.35± 1.25mg/L,TP:7.99±0.57mg/L)purification.The treatments include blank groups(NA-0),adding microorganisms(NA-M),adding plant-residues(NA-P),adding plant-residues and microorganisms(NA-PM)under non-inflated aeration;While the same treatments IA-0,IA-P,IA-M,IA-PM under inflated aeration.After 20 days of experiment,we found that:(1)All IA groups decreased concentrations of TN to an average level of 3.85 mg/L,TP concentration decreased to an average level of 0.84 mg/L,compared with the NA group s' average level of 7.91 mg/L and 3.15 mg/L,The inflated aeration can significantly reduce the concentration of TN and TP in the water.(2)TN and TP average concentrations in the NA-P group were 8.7 mg/L and 3.57 mg/L,which were higher than those of the NA-0 group(7.53 mg/L and 1.91 mg/L);NA-PM group's TN was 9.67 mg/L and TP was 3.55 mg/L,compared with NA-P group,TN concentration was higher and TP concentration was similar;The concentrations of TN and TP in IA-P group were 4 mg/L and 0.62 mg/L,compared with NA-P group,concentrations of nutrients were significantly decreased;IA-P groups compared with IA-0 group(TN 3.8mg/L;TP 0.57mg/L),there was no significant difference in the concentration of nutrients.It can be found that the presence of plant residues in the water will increase the concentration of TN and TP.If the dissolved oxygen content is low and the organic matter is rich,the direct use of microorganisms will increase rather than decrease the concentration of water nutrient;The inflated aeration can reduce the effect of plant-decaying and significantly reduce the nutrient concentration in the water.(3)The concentrations of TN and TP in NA-M group were 5.73mg/L and 3.57mg/L,compared with NA-0 groups' TN(7.53mg/L)and TP(1.91 mg/L),TN concentration decreased and TP concentration increased.There was no expected significant reduction in the both TN and TP concentrations in the water.The result showed that the concentration of TN and TP in IA-M group were 3 mg/L and 0.51 mg/L,significantly lower than NA-M group.Compared with IA-0 groups(TN 3.8mg/L;TP 0.57mg/L),the TN and TP removal rate in IA-M group increased from 82.2%and 91%to 86.7%and 93.9%.It was found that aerobic conditions can improve the purification ability of microorganisms and improve the water quality.Compared with the method of aeration,the method of aeration and adding microorganism can better reduce the nutrient concentration in water.