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A novel domestic wastewater treatment system for reuse was proposed, which consisted of a microaerobic EGSB reactor unit and the following chemical phosphorus removal unit, as a low-cost and highly efficient process. In order to confirm the feasibility of the domestic wastewater treating technique at ambient temperature for reuse through the combination of the micro-aerobic EGSB reactor and the chemical...
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...
Antofine and Cryptopleurine, natural products belong to the phenanthroindolizidine and phenanthroquinolizidine group of alkaloids, have attracted much attention because of their extremely potent inhibition of cancer cell growth. In this paper, seven analogues with different substituents on phenanthrene ring were designed and synthesized, the chemical structures of these derivatives were characterized...
A sequencing batch reactor was employed to treat high ammonia concentration wastewater and investigate the shortcut nitrification rates under different aeration and sludge retention time(SRT) conditions. During the start-up stage SRT and temperature were set at 12d and 30°C, respectively, and complete shortcut nitrification was achieved on 31d. The effect of aeration, SRT on ammonia oxidation rate,...
Through the choose of inorganic flocculants (Ferrous sulfate (FS)) and the organic polymer flocculant (PAM) of diatomite was modified, using modified diatomite to treat ammonia-nitrogen wastewater. The experiment indicated that adsorption process of modification of the type and dosage, diatomite consumption, pH, in the initial concentration of ammonia solution is the impact of ammonia adsorption of...
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....
In order to investigate the overall characteristics of the transcript profiles associated with these puzzling biological effects. We used the Agilent Rice Oligo Microarray to learn the molecular mechanism in rice responding to ion-implantation. The analysis of the genechip array shows that there were 982 transcripts expressed differentially (fold change > 2 and P value < 0.05) including...
The status of rural water environment in China was analyzed and the corresponding countermeasures were pointed out in this paper. Only by means of the golden opportunity for development of new rural areas, perfecting management system, developing and utilizing advanced technology, strengthening environmental awareness of farmers and giving substantial financial support, the healthy circulation of...
In order to solve the increasingly serious problem of eutrophication in China, the government had issued a new wastewater discharge standard that focuses on reducing the nutrients from effluents (TN < 15 mg/L, TP<0.5 mg/L). These stringent new requirements had resulted in the need for improved nutriment removal from existing full-scale wastewater treatment plants. In this study a series...
The effect on zeolite adsorption-regeneration to the potassium was studied, and the factors affected the results were discussed. The results showed that the maximum adsorption of zeolite to potassium (K2O) was 48.9245mg/g and the main influence factors were concentration, time, temperature and pH. The coexistence of ammonia and potassium would not affect the results greatly.
Selection of filter materials in constructed wetlands used for eutrophic water treatment was studied. Volcanic rock, ceramsite, composite soil and gravel were chosen for experiment. Esothermal adsorption tests demonstrated that volcanic rock and ceramsite had good adsorption capacity of ammonia nitrogen while composite soil and ceramsite had good adsorption capacity of total phosphorus (TP). Continuous...
By investigating the nitrogen concentrations in effluents of the horizontal subsurface-flow constructed wetlands under the conditions of different kinds of substrates, residence time and heights, as well as the nitrogen concentrations changes along the flow in the wetlands, the nitrogen removal routes in the wetlands were analyzed. The results demonstrated that the wetland system with zeolites demonstrated...
Removing NO3− in polluted groundwater of in-situ leaching uranium mine with iron powder (zero-valent iron, Fe0), DNB, iron powder and DNB are studied. The condition of tests include different pH of solution, dosage of iron powder, and treating time. The experimental results show that over 93% of NO3− in unneutralized polluted groundwater (pH value about 1.46) can be removed with 16.5 g·L−1 iron powder...
Improved microporous Carrousel oxidation ditch is the current treatment trends, which can be modified to synchronize denitrification and phosphorous removal. In this paper, with improved microporous Carrousel oxidation ditch process as the research object, the effects of dissolved oxygen, carbon, sludge age, temperature, pH and the inverse sludge ratio of sludge on the removal of phosphorous and nitrogen...
The mechanism of phosphorus removal by iron-contactor process (PRICP) is illustrated from two aspects: metallic corrosion and phosphorus removal by ferric salt. Advances in PRICP are reviewed to shed some light on the research focus in the future for the sake of in-depth study and wide application.
The performance of denitrification was investigated under the condition of the low organic loading and C/N ratio during 35d. The nitrate was acted as the electron accepter and the sodium acetate was acted as the electron donor. When the carbon loading and the C/N ratio were 0.6 kgCOD/kgVSS·d and 3.4 respectively, the NO3-N was reduced to 1mg/L, nevertheless the NO2-N was increased to 14.39 mg/L during...
Static and dynamic simulation of effect of carbon source and hydraulic retention time (HRT) on removal performance of nitrogen and phosphorous were carried out by using activated sludge model software Biowin3 for typical anaerobic-anoxic-aerobic (A2/O) process in municipal wastewater treatment plant. The static simulation results showed that increasing C/N and C/P could improve obviously removal performance...
Suaeda salsa is a typical pioneer species which can grow well in high salt environmental conditions. The objective of this study is to evaluate the effect of different levels of salinity (5.25, 10.5 and 21g NaCl per kg soil) and nutrient supply (0, 0.3, 0.6 and 1.2g urea per kg soil) on plant morphology, biomass, accumulation of ions and C/N ratio in leaves of S. salsa. The results showed that the...
An innovative process step-feed Anaerobic-(Anoxic/Oxic) n -Membrane Bioreactor [An-(A/O) n-MBR] was developed to treat synthetic domestic wastewater. Performance of the lab-scale system was investigated at different organic compounds in the influent. The results showed that, under the conditions imposed, although the COD concentration fluctuated in the range of 120–1200mg/L, high performance on COD...
For probe into the application of Azotobacter on Eucalypt plantation, the method of dip roots was used for Azotobacter inoculation to the seedling roots of GL09 Clone of Eucalyptus urophylla×E.grandis. The experiment result show that there were distinct effects of Azotobacter on Seedlings Growth and chlorophll content and nitric acid deoxidize enzyme activity of GL09 Clone of Eucalyptus urophylla×E...
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