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A new process for reduction of waste sludge by ultrasound has been demonstrated. In former studies, ultrasound was mainly used for dehydration of waste sludge. Otherwise, it has been reported that ultrasound could efficiently provide a chance for excess sludge removal in reactor directly. Therefore, ultrasound was suggested to reduce waste sludge in SBR reactor in this paper. The results showed that...
Water Pollution sources dissection has important guiding significance for drinking water sources protection. Focused on QingShuiHai valley, the research investigated water quality by uniform distribution sampling in the area in 2007∼2008, and analyzed pollution sources characteristics. The results showed that the concentration of Total Nitrogen (TN)(0.15–7.99 mg L−1) was 0.3 ∼ 15.98 times higher than...
In this paper, the adsorption effects of two kinds of domestic anion exchange resins (201×7 and D407) to NO3− in water were compared, as well as the adsorption effects of the anion resins mixed with cation exchange resins (001×7and D001) to NO3− in water and performed the electro-regeneration experiment of the mixed resins were studied, in order to explore the feasibility of treating nitrate-contaminated...
It was the first time that the Influences of main factors, such as pH of solution, the value of C/N, the different kinds of carbon sources and temperature on removing NO3− in polluted groundwater from in-situ leaching uranium mine by denitrifying bacteria (DNB), have been studied domestically. The tests results showed that the optimum pH was between 6 to 8. When pH≦5, the removing rate of NO3− decreased...
In this study, based on the total coliforms (TC) and total bacteria (TB) detected in rural drinking water resources (RDWR) of Ya'an, and applying exponential model and β-Poisson model of “low microbe content risk assessment”, the quantitative evaluation of risk associated with TC count and TB in 221 water samples was developed. Results showed the annual risk values (ARV) of all the water samples were...
Sancha lake is the second largest lake in Sichuan Province, the factors of affecting eutrophication are not only point pollution source, but also non-point pollution source. The results of the investigation show: drawing water is 50% of total phosphorus contribution, cage culture is 10.44%, 39.21% of precipitation and surface runoff, sewage is 0.35%, although the drawing water is 50% of the total...
Based on principal component analysis theory, this paper has evaluated the water quality in Ge Lake by using the characteristics of principal component analysis-the integrated treatment of dimensionality reduction. The results show that the water quality in Ge Lake has been at or inferior to the IV class, Ge Lake water body has in general reached the later period of moderate eutrophication. The main...
Liangtan River is a typical and heavily polluted branch river of the Three Gorges Reservoir. A survey and analysis of the pollution condition of the river can provide basic data and over planning consideration for basin pollution prevention and environmental rehabilitation, based on which a monitoring survey was carried out and analyzed on water quality of Liangtan River. The analysis found out the...
In order to restore soil polluted by crude oil, soil collected from an oil field located in northeast China were chosen to study in this research, from which three oil degrading bacteria were obtained by means of bacteria screening. We use them ultimately in order to make little damage to the micro-ecological environment. The experimental results indicated that, the degradation rate increases over...
Water and sediment samples, collected from Meiliang Bay in Taihu Lake, were employed to investigate the dynamic of phosphorus in water-sediment interface during the courses of proliferating, blooming and decaying of C. Reinhardtii under simulated conditions. Particulate phosphorus released from the decayed algae and sediment increased the availability of phosphorus to algae during the incubation....
A laboratory-scale biofilter was used to treat waste gas containing NH3. Its performance, transformation mechanisms and microbiological characteristics were investigated in this study. The inlet concentration of ammonia varied from 20∼300mg/m3, and the air flow rate were 0.61m3/h, 0.85m3/h and 1.06m3/h, equivalent to empty bed residence time of 35s, 25s and 20s. The experimental results showed that...
The experiment investigated decoloration rate of the mixed solution under visible light, which was consisted of lixivium and dye solution. The lixivium was got through the process of purifying silica sand by the means of ultrasonic treatment. Meanwhile, the effect of the concentration of ethanedionic acid, time of treatment by ultrasound, the initial concentration of dye solution and the volume of...
Bioremediation of PAHs in three contaminated levels (L1, L2, L3) with diesel-treated soils was investigated with planting or unplanting Chinese subtropical tree Cinnamomum camphora for 12 months. The mean residual PAHs concentrations in soils with planted and unplanted treatments were 78.2% and 63.6%, respectively. Significant differences were observed in PAHs concentrations between planted and unplanted...
The low propagation coefficient was a main obstacle in tree peony regeneration for a long time. Here, we present a new plantlet regenernation system to significantly improve the propagation coefficien in tree peony regeneration by lateral buds exsectting and engraving. The procedure are briefly as follows: (1)The medium for proliferation was WPM + 6-BA3.0mg/L + IAA 0.2mg/L, with the proliferation...
Triethylene glycol (TEG) liquid was used to a liquid membrane material for indoor air humidification. An novel surface-soaked liquid membrane under vacuum permeation was developed using a hydrophobic microporous membrane, only one surface of which was hydrophillic-treated to contain TEG by corona treatment. A flat membrane module with 0.39 m2 area was placed in outdoor, and water vapor was permeated...
As the oil shale retorting process is unique, resulting wastewater contains large amounts of oil, sulfide, cyanide, volatile phenol, ammonia and other toxic substances, its high content of COD and refractory material and more. This paper attempts to establish a comprehensive titanium dioxide photocatalytic water treatment methods of oil shale, and shadow detail catalytic sewage treatment factors such...
The treatment of high concentration organic wastewater by microwave Fenton process was studied in this paper. The input volume of Fenton reagent, microwave power, reaction time, initial pH value is investigated to study the impact of the effect of the high concentration organic wastewater treatment. The optimum condition of Microwave-Fenton oxidation is: the pH reaching 3, Fenton reagent composition...
A new kind of floating bed named Integrated Ecological Floating Bed (IEFB) was constructed and optimized employing Oenanthe javanica, Hyriopsis cumingii Lea and artificial media. This paper studied the effect of IEFB on eutrophic water quality improvement with results showing that the average removal rates of TN, TP, NH4+-N, CODMn and Chl-a by IEFB were up to 42.6%, 56.6%, 77.7%, 13.5% and 62.2%,...
By analyzing the hydrologic and water quality monitoring data of typical stations of Poyang Lake, the objectives were to describe the characteristics of water quality in water-level changes. The results indicated that: the average water level of Poyang Lake showed downward trend, further more, water level amplitude of Poyang Lake was increasing in recent years; the concentrations of NH3-N and CODMn...
The shallow groundwater of plain area is the main source of water supply for ZhengZhou city. Studying on the groundwater of plain area vulnerability has important and practical significance for using and protecting groundwater resources sustainablely. On the basis of DRASTIC model, DRATMC model is created by selecting the depth to shallow groundwater and other five parameters to assess shallow groundwater...
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