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 Posted: Sat 20:06, 05 Feb 2011 Post subject: uggs outlet rotterdam During the second phase of T |
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During the second phase of Three Gorges Project reservoir drinking water source
50.0o%. 2.3 Water Quality in June after impounding 11-15 and 20 monitoring items 11 items, with the filling of the same; 30 to 24,[link widoczny dla zalogowanych], with the water the same as before, Fengjie starting from June 13 to stop using Yangtze River water, drinking water reservoirs enable the youth stream of water. Water were monitored at the county level during this period, 51 water samples, 9 were qualified, a pass rate of 17.65%; failed 42, total coliform is a failed project (82.35%). The total coliform bacteria 7d rates were 28.57%, 14.29%, 28.57%, 14.29%, 14.29%, 14.29%,[link widoczny dla zalogowanych], 11.11%. Chemical and toxicological total of 17 indicators, all qualified. 3 to discuss the water main bacteriological indicators of water failed (do sensory evaluation index), before water storage, water storage period, total coliform bacteria after water storage decreased rate were 72.73%, 60. 87%, 17.65%, due to: water storage before the river flow speed, self-purification ability, coupled with water intake points along the river in the district, county, upstream, so the higher rate of total coliform bacteria; 3d storage period, 10m water level rising at a rate per day, due to storage time is short, the deterioration of water quality in a time course, water quality in a short time also showed no major changes, so the water and the water front of the pass rate of total coliform do not differ greatly, but, because the river began to expand, the ruins began to sink into the river bottom, rain erosion and other pollution caused a slight decrease in passing rate; water, the total coliform bacteria was significantly decreased, and the pass rate is close, the resulting The reason is a combination of factors: (1) Three Gorges water level up to 135m, the water level will not rise, the Yangtze River water flow is slow, self-purification capacity variation,[link widoczny dla zalogowanych], 135m below the water level in the ruins of all sink into the river bottom, the water widened, and the waste into the river, before the formation of reservoirs, reservoir water turbidity,[link widoczny dla zalogowanych], with the short extension of time is bound to breed microbes, total coliforms; the water balance, little change in other conditions, so the pass rate remained at 14% volatility. On the other hand, with time, the reservoir of water constantly updated, more and more clear, microbial indicators may also be reduced. (2) water into the library, the Chongqing section of the Yangtze River Three Gorges Reservoir Area and Wushan, Yunyang and other places the river to rise, slow water flow, flow direction changes, the river upstream from the dam upstream, the more the flow rate through the dam into the more slowly , large numbers of floating debris, microorganisms into the water, causing the total coliforms. (3) of the Three Gorges Reservoir after the water storage reservoir is continuous rain event, the coastal people, livestock manure, waste is washed into the Yangtze River, the river water flow rate than before the slow decline in self-purification ability, cause some pollution. (4) after the completion of the Three Gorges along the scenery changes, the Three Gorges Tour and become the new hot spots, cruise and ferry passengers excreta (faeces) have adopted vertical type, did not have any disinfection treatment, it is understood there every day on the reservoir one thousand to run on all vessels in the Yangtze River, although expressly prohibit the dumping of garbage into the river, but did not prohibit urinating into the river, which slowed down in the reservoir water purification and defecate into the river diminished circumstances, is bound to make bacteriological index exceeded more serious. (5) along the river are flooded siting the new town, to stay in the new county resident, will inevitably bring garbage, sewage, fecal excretion, but the two sides Despite the design and construction of the Metro sewage treatment plant, build the dam but for various reasons water,[link widoczny dla zalogowanych], the sewage treatment plant has not yet fully operational, as planned sewage treatment plant all completed and put into use, microbial indicators will also be improved. In summary, the Three Gorges Reservoir water storage before and after drinking water quality in the sensory characteristics and general chemical indicators, toxicological indicators are no significant changes, only total coliform bacteria in drinking water sources in the water before and after higher passing rate of change. Building of the reservoir water level rise, leading to two rivers and the secondary rise in river levels, flow rate slows down, the water flow increased from 3.8m / s will be reduced to 0.38m / s, the water self-purification capacity will be greatly reduced, sedimentation, bottom heavy metals (mercury, lead, chromium, etc.) deposition, if the 1.28 billion tons per year (1.28xl09t) does not reduce the amount of sewage discharge, water body eutrophication may occur, the passing rate would reduce the total coliform . Priority is to improve the river pollution, increase the sewage, solid waste treatment, industrial pollution control, solid waste clean-up along the secondary river pollution control and ecological protection, environmental protection and greening to enhance reservoir basin, and strengthening water source water, finished water monitoring, water disinfection, water management, so that reservoir is always mountains.
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