Research On In-situ Biologic And Ecologic Technology To Improve The Quality Of Landscape Water

Despite a lot of work had been done in the water environment construction, these measures focused on eliminating sources of pollution, but the water quality didn't meet the level people expected. That was because the city section of the creek still had to receive the pollution caused by the initial rain, the ecological deteriorated for the gating stagnation and the water retention capacity was poor. The issue based on the in-depth investigation of river pollution in urban status, took Yangzhuang creek water quality improvement as the research object, used the combination of in-situ bio-ecological technology to improve the landscape water quality. By bio-ecological technology such as in-situ aeration - biological oxidation process could remove the pollutants of the landscape water and carried by the initial rain. At the same time, I studied the relations between landscape water DO and water quality and sensory indicators.The main conclusions were as follows:First, in-situ aeration - biological oxidation process could effectively improve the quality and enhance the ecological function of landscape water. During steady-state operation, the average removal rate of COD was 45%, the average removal rate of NH3-N, TN, TP was 33%, 28%, 32%, and the removal efficiency was stability. During steady-state operation, the average removal rate of COD was 45%, the average removal rate of NH3-N, TN, TP was 33%, 28%, 32%, and the removal efficiency was stability.Second, in allusion to landscape water deterioration caused by heavy rain, the equipment could quickly restore the water quality to the normal. By three times experiments we knew, the recovery took about three days while generally the river water quality restored in 15 days. We also found that the recovery time shorter in summer than in winter, temperature was a important influence factor.Third, in allusion to the pollution carried by the initial rain, the innovative design at the end of gully was in-situ bio-reduction, it could take a obvious effect on the reduce of the pollution carried by the initial rain. Monitoring results showed that device could retain 50% of the COD, while NH3-N, TN, TP could achieve different levels of reduction, reduced the impact of the initial rain.Finally, we found that aeration to maintain landscape water DO at some level was a important measure to keep water quality and sensory indicators maintained. By changed the aeration device, we made the DO in water maintained at different levels. We could see that when the water was DO maintained at 1.8 mg/L, the water quality after the section could be maintained, and the transparency was greatly increased. When the water DO was maintained just at 0.8 mg/L, the water quality after the section decreased, the transparency reduced and at the end of the creek exists noticeable differences olfactory.Through the trial run about 1 year we could see, in-situ bio-ecological technology was effectively and stablely in practical process, took a obvious effect on the reduce of the pollution carried by the initial rain. In-situ biologic and ecologic technology effects in the application process was stable, adaptable, with low maintenance cost, could be widely applied to urban landscape water quality improvement and ecological restoration.