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Screening and allocation method of constructed wetland plants for shipbuilding saline sewage treatment
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A technology for sewage treatment and constructed wetlands, applied in biological water/sewage treatment, water/sludge/sewage treatment, seawater treatment, etc., to achieve the effect of wide source and convenient management
Active Publication Date: 2019-05-21
舟山光大检测研究院有限公司
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[0004] These studies have shown that it is feasible to use artificial wetlands to treat salty sewage from coastal shipbuilding, but the high salinity environment of shipbuilding comprehensive wastewater has a significant inhibitory effect on plant growth, so there have been no reports in this area, especially suitable for Constructed wetland plants for shipbuilding and saline sewage treatment
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Embodiment 1
[0017] The investigation of salt-tolerant plants that can be applied to the coastal zone environment was carried out, and the main objects of the experiment were determined to be Spartina, yellow iris, irises, short-tailed rushes, water onions, cannas, chrysanthemums, reeds, and cattails. experiment. The above-mentioned plants were cultivated with sewage water containing 10%, 30%, and 50% seawater. The water quality of the sewage used was as follows: COD, 189.6±26.7; BOD5, 82.0±15.6; NH4+-N, 21.3±9.0; TN, 26.2±10.2; TP, 2.4±0.9; SS, 161.0±38.1. After 90 days of cultivation, the salt and pollution resistance ability was evaluated by observing the plant growth, root length, root number, root activity, and leaf malondialdehyde (MDA) content.
[0018] The ability of plants to adapt to saline sewage is reflected by indicators such as plant growth, root number, root length, and leaf malondialdehyde (MDA) content. The growth of plants is expressed by relative growth rate (RGR),
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Embodiment 2
[0042] Establishing a scientific salt-tolerant wetland plant screening and purification potential evaluation system is a problem that must be solved in the wetland plant screening work. It can be seen from the single index ranking of the test plants that there is a certain correlation between the rankings of different indexes, but there are also significant differences, indicating that the use of a single index cannot scientifically and objectively reflect the salt tolerance and sewage purification potential of plants. Therefore, in this study, the eight indicators of root length, vigor, leaf malondialdehyde content, growth, plant nitrogen concentration, plant phosphorus concentration, plant nitrogen accumulation, and plant phosphorus accumulation were comprehensively aggregated by Euclidean distance. class analysis, the results are as follows figure 1 , figure 2 and image 3 shown.
[0043] Depend on figure 1 and figure 2 It can be seen that when the proportion of seaw...
Embodiment 3
[0046] The concentration of seawater in the sewage to be treated is 10%, and the three plants of iris chrysanthemum, chrysanthemum and reed are mixed in equal proportions in the artificial wetland, with a total planting area of 15m 2 , the influent load of the constructed wetland during the test period is 0.15m 3 ·(m 2 d) -1 , the inflow flow is 40m 3 · d, the total residence time of the sewage to be treated in the wetland is 3-5 days, and the system operates continuously for 24 hours. The removal capacity of constructed wetlands for COD is about 25g m -2 d -1 , for NH 4 + -N removal capacity is about 1.5gm -2 d -1 .
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Abstract
The invention discloses a method for screening and arranging plants of a constructed wetland for saline wastewater treatment during ship repairing and building. Herbaceous plants that are applicable to the constructed wetland for the saline wastewater treatment during the ship repairing and building are screened among salt-resistant herbaceous plants applicable to the environment of a coastline according to salt-resistant and pollution-resistant capacities, adaptive capacity and physiological characteristic indexes by means of characteristics of saline wastewater during the ship repairing and building, and the plants that are obtained by means of the screening are arranged respectively according to the content of seawater in the wastewater. According to the method for screening and arranging the plants of the constructed wetland for the saline wastewater treatment during the ship repairing and building disclosed by the invention, wetland plants that are applicable to a high-salt environment and has a strong wastewater purification capacity are obtained by means of scientific screening according to the characteristics of the saline wastewater during the ship repairing and building, and the plants are arranged reasonably according to the respective characteristics of the wetland plants and the content of the seawater in the wastewater; the wetland plants have the advantages of wide source, convenience for management, low operating cost and obvious wastewater pollution effect, and are particularly applicable to planting on the constructed wetland for the saline wastewater treatment during the ship repairing and building.
Description
technical field [0001] The invention relates to the technical field of ecology and environmental protection, in particular to a method for screening and arranging artificial wetland plants for treatment of shipbuilding saline sewage. Background technique [0002] The rapid development of the world's port industry and shipping industry has promoted the further prosperity of the ship repair and manufacturing industry. With the eastward movement of the world ship repair industry, it has provided a good development opportunity for the development of China's shipbuilding industry. With the development of the marine economy and port-side industries such as shipbuilding and shipbuilding, a large amount of building sewage will be generated in the process of ship cleaning and repairing. The building sewage includes oily wastewater and domestic sewage, and the oily wastewater includes engine room oily wastewater, ballast water, Dock bottom oily wastewater, etc. Construction sewage se...
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