Jiaxing Water Conservancy Investment Ltd Company

Jiaxing, China

Jiaxing Water Conservancy Investment Ltd Company

Jiaxing, China
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Wang B.,CAS Research Center for Eco Environmental Sciences | Wang B.,University of Chinese Academy of Sciences | Pan X.,CAS Research Center for Eco Environmental Sciences | Pan X.,University of Chinese Academy of Sciences | And 6 more authors.
Chinese Journal of Environmental Engineering | Year: 2015

Guanjinggang constructed root channel wetland is an updated version of Shijiuyang wetland. It adopts complexes of pre-pond, plant-bed/ditch wetland and post-pond to purify the polluted water source in plain stream network and aims to provide purified raw water for Guanjinggang drinking water plant. Purification efficiency of Guanjinggang wetland on polluted water source was examined during its commissioning period. Removal rates of wetland on major indexes were as follows: total suspended solids (22.45%), NH4+-N (66.80%), TN (45.44%), soluble reactive phosphorus (66.67%), TP (50.28%), TOC (29.39%), COD (59.26%), chlorophyll-a (68.93%), chlorophyll-b (91.82%), chlorophyll-c (84.15%), algae density (42.42%), Cr (31.74%), Cu (23.21%), Ni (82.47%), Zn (52.24%), Pb (40.44%), and total ionic content (10.71%). By comparison, Nanjiaohe stream as present water source of drinking water plant and Haiyantang stream as water source of wetland have pros and cons to each other. However, most water quality indexes in Nanjiaohe stream were inferior to those in wetland effluent. Expectedly, with the development and maturation of Guanjinggang wetland ecosystem, it will provide stable and significantly improved raw water for drinking water plant. Existing problems and suggestions of Guanjinggang wetland during its commissioning period were put forward. ©, 2015, Science Press. All right reserved.

Zhang W.,Shanghai Ocean University | Wang W.-D.,CAS Research Center for Eco Environmental Sciences | Wang L.-Q.,Shanghai Ocean University | Zhang R.-L.,Shanghai Ocean University | Chen Q.-H.,Jiaxing Water Conservancy Investment Company
Chinese Journal of Applied Ecology | Year: 2011

Aimed to explore the purification effect of constructed wetland on phytoplankton community structure, an investigation was conducted on the species composition, biomass, and community diversity of phytoplankton in the water body of Shijiuyang constructed drinking water source wetland of Jiaxing, Zhejiang Province of East China in winter, 2010. A total of 77 phytoplankton species were identified, belonging to 39 genera of 7 phyla. The main phylum was Bacillariophyta, with 33 species of 14 genera. The dominant species were Melosira varians, Cyclotella meneghiniana, Nitzschia sp., Chroococcus sp., Dactylococcopsis rhaphidioides, Scendesmus quadricauda, and Tri-bonema bombycium, among which, C. meneghiniana had the highest dominance (0.144). The phytoplankton density in winter was averagely 1.28×10 6 cell · L -1, with the minimum (6.80×10 5 cell · L -1) in the water outlet, and the density of Cyanophyta in the water outlet was significantly lower than that in the water inlet (P<0.05), only occupying 14.9% of the latter. The Shannon index of the phytoplankton community at the sampling sites ranged from 0.94 to 1.27. According to the cluster analysis and multidimensional scaling (MDS), the phytoplankton community was classified into five phytoplankton community groups, i. e., root-channels littoral community, root-channels flow community (2 styles), highly purified area community, and headwater region community. Diverse ecological environment and water flow velocity at the sampling sites were found to be the main contributors to the formation of the five phytoplankton community groups.

Wang Y.,CAS Research Center for Eco Environmental Sciences | Wang Y.,University of Chinese Academy of Sciences | Wang B.,CAS Research Center for Eco Environmental Sciences | Wang B.,University of Chinese Academy of Sciences | And 3 more authors.
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2013

In winter, the removal of organic matter in Shijiuyang root channel wetland was low. We suggested that it was only an apparent phenomenon and hypothesized that in cold season, the constructed root channel wetland could remove the non-biodegradable organic matter effectively from source water and release certain amount of biodegradable organic matters, thus resulting in low removal rates for organic matter. To test this hypothesis, we examined the spatial distribution of biodegradability of organic matter in the riparian zones and plant-bed/ditch systems in Shijiuyang wetland during winter. Results showed that the biodegradability of organic matter within the wetland was much more than that of source water. The classic ratio r(BOD5/CODCr), reflecting the biodegradability of organic matter in water, ranged between 0.26~0.84 with 80% of data exceeding the lower limit (0.30) of biodegradability within the wetland and much higher than that of source water (0.0999). After the wetland treatment, the organic matter feature in the water changed significantly. The ratio r(CODCr/TOC), reflecting the relative composition of organic matter, ranged between 0.85~2.57 with a mean of 1.90 within the wetland, significantly less than that of source water (5.41). It was suggested that a large quantity of reducible organic matter was removed. Results also showed that part of aromatic compounds were intercepted and retained by the wetland. These results demonstrated that in cold season, Shijiuyang wetland could exhibit a relatively high efficiency for the removal of organic matter from source water. The crisscrossed plant-bed/ditch systems and the core of constructed root channel technology were the key area for the water quality improvement of the wetland.

Wang Z.-Q.,CAS Research Center for Eco Environmental Sciences | Wang Z.-Q.,University of Chinese Academy of Sciences | Zhang R.-B.,Jiaxing Water Conservancy Investment Ltd Company | Chen Q.-H.,Jiaxing Water Conservancy Investment Ltd Company | And 2 more authors.
Huanjing Kexue/Environmental Science | Year: 2012

Shijiuyang constructed wetland (SJY-CW) in Jiaxing City adopted plant-bed/ditch systems originated from the natural landscape as its major functioning unit. The constructed root channel technology (CRCT) is the core technique applied within the plant-bed/ditch systems. Monitoring results demonstrated that the wetland had the capability of improving water quality indexes by one rank grade according to the national environmental quality standards for surface water (GB 3838- 2002). In order to optimize the water quality improvement function of plant-bed/ditch systems and CRCT, a pilot project in SJY-CW was constructed from May to October, 2010. The project contained 16 independent experimental cells. Orthogonal test design was applied to probe into the effects of constructed root channel layers, plant species combination, and reinforced physical substrates on promoting the water quality amelioration efficiency of the plant-bed/ditch systems. Comprehensively considering water treatment effects, construction difficulty, and construction and maintenance cost, the recommended optimal ways are as follows. Plant straws were preferably paved under subsurface zones by two layers with a gap of 20- 30 cm. The preferable plant combination was reed (Phragmites australis) plus wild rice (Zizania caduciflora). Calcite might be applied as alternative reinforced media in some suitable sites of plant-bed/ditch systems. Water treatment effects were compared between pilot project and the whole wetland area of SJY-CW. The results showed that the reinforced pilot project exhibited higher treatment efficiency for nutrients than SJY-CW itself. The removal rates of total nitrogen, total phosphorus, and ammonia nitrogen were increased by about 20%- 40% in the pilot project. This suggested that SJY-CW could release its vast water treatment potential by means of increasing water flux through the subsurface root channel zones of plant beds. Therefore, some adjustment and control measures could be proposed to maintain the tradeoff balance between the potential release and maximization of wetland treatment efficiency and the treated water amount, such as constructing or modifying the hydraulic structures to regulate flow amount through large ditch, redistributing water flow and increasing the water head difference between the two sides of alternate small ditches.

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