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Study on Sewage Treated by Two Kinds of Integrated Vertical Constructed Wetlands

Author: ChenXiuJuan
Tutor: ZhangChaoLan
School: Guangxi University
Course: Plant Nutrition
Keywords: Vertical Flow Constructed wetlands Purifying effect Enzyme activity
CLC: X703
Type: Master's thesis
Year: 2007
Downloads: 247
Quote: 0
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Abstract


Availability of freshwater resources in gradually reduce the the traditional biochemical process better, but the high cost of processing, so that the sewage treatment rate is low, and constructed wetlands for domestic wastewater treatment system is low cost, good purification effect, high landscape value the characteristics to become a trend for future research. In this paper, screening plants, the establishment of a composite vertical flow constructed wetland (Ⅳ CW) system and improved composite vertical flow constructed wetland (Ⅱ Ⅴ CW) system. Through the study of the distribution of two different configurations artificial wetland plant growth, the effect of sewage purification, matrix activity space, explore better run mode, purification better the composite vertical flow constructed wetland configuration and plant combinations; analysis correlation matrix enzyme activity and the effect of sewage purification Preliminary purification mechanism of the composite vertical flow constructed wetlands for domestic wastewater treatment using artificial wetlands provide a theoretical basis and practical experience. The main findings are as follows: (1) aquatic plant screening test results show that the flood sword, sun grass, water Roland growth conditions are very good, very apparent height, fresh weight growth of purifying effect of TP, COD, TN very well. The final choice Sungrass, flood sword as artificial wetlands spare plant. (2) artificial wetland plant growth conditions are good, there was no nutrient deficiency disease. Plant growth is slightly different between the two configurations, except Ⅱ Ⅴ CW of Ⅳ CW Canna plant height, number of ramets than canna, the remaining three plants are good growth conditions than Ⅳ CW Ⅱ Ⅴ CW configuration. (3) under the same configuration, different combinations of plants constructed wetland treatment system for sewage purification effect. Compared with the species artificial wetland system, the purifying effect of artificial wetland system to grow plants generally better than the species of wetland system, which Coleus - the sun grass portfolio of wetland systems purify better than Canna - flood Sword combination. (4) two conformations of constructed wetlands for wastewater have better purification effect. In the composition under the conditions of the same plant, the removal of organic pollutants (COD), the denitrification (NH 4 -N, NO 3 -N, TN) aspects are Ⅱ Ⅴ CW removal better the Ⅳ CW. The TP removal Ⅳ CW removal better Ⅱ Ⅴ CW. (5) the the wetland substrate layer phosphatase, urease, catalase activity highest. Artificial wetlands of the same configuration, Coleus enzymatic activity - the combination of sun, grass plants are generally better than Canna - a combination of high flood sword plants. Phosphatase, urease activity variation: the upper layer (0 ~ 5cm) higher than the mid-level (5 to 15cm) middle than the lower (15-25cm); hydrogen peroxide activity variation: the upper layer is higher than the lower lower higher than the middle. (6) by correlation analysis of the upper matrix enzyme activity and the sewage purification effect can be seen, the stromal phosphatase activity, and between the TP removal presence of highly significant positive correlation (r = 0.9975); matrix urease activity and TN COD removal efficiency was significantly positively related (respectively r = 0.9712,0.9592). Consolidated results of the study can be seen, better than Ⅳ CW Ⅱ Ⅴ CW configuration purifying effect; Coleus - the sun grass combination of the purification is better than Canna - flood sword combinations, and better explore purification composite vertical flow constructed wetland structure type and plant combinations provide experimental support.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
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