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Wastewater discharged from the campus is characterized as low-strength and relative centralization of usage period. The feasibility of sequencing batch activated reactor (SBR) treating low strength domestic wastewater generated in a campus were investigated through orthogonal test. Considering the pollution decomposition efficiency and the energy consuming, the optimal parameters for SBR treating...
Biosorption of organic pollutants, expressed as COD, by aerobic and anaerobic sludge was conducted to examine equilibrium and kinetic models. Freundlich and Langmuir models were mostly used for mathematical description of the biosorption equilibrium. Freundlich equation was more fit to describe the equilibrium of biosorption process in this study. Under the same experimental condition, biosorptive...
In the present study we reported the feasibility of extracellular biopolymer (PF-9) produced by Pseudomonas fluorescence C-9 as an alternative biosorbent to remove Pb(II) metallic ions from environmental and industrial wastewater.The ability of PF-9 to remove the metallic ions was investigated by using batch biosorption procedure. The effects such as, pH, biosorbent dosage, sorbate concentrations...
Nowadays, endocrine disruptor compounds in the water system have become a concern due to the risk of contamination to wild life and humans even at the nanogram level. Excess estrogens and androgens are a major contributor group of endocrine compounds. Statistical surveys have shown that dairy farms contribute to over 90% of the total estrogens in the UK and US. An analytical system is being developed...
Trichloroethene (TCE), usually in the form of dense non-aqueous phase liquid (DNAPL), is a widely used degreasing ingredient causing profound soil and groundwater contamination. While bio-enhanced dechlorination of TCE to harmless Ethene is a promising technique for waste water treatment, the mechanism and related phenomenon have not been thoroughly understood, especially in groundwater. A comprehensive...
There are many case studies of vertical flow constructed wetlands. However, issues of effectiveness of the vertical flow constructed wetland plants in filtering pollutants needs to be addressed. In the current experiment, three plant species are discussed. The results show that among the three chosen plant species, Juncus effuses was more effective in removing pollutants than Canna generalis and Typha...
The effect of an improved membrane bioreactor (IMBR) on COD, NH3-N and TN removal and membrane fouling alleviating was investigated through a comparative study with a traditional submerged membrane bioreactor (SMBR). The variations of trans-membrane pressure (TMP), concentration of mixed liquid suspend sludge (MLSS) and extracellular polymeric substance (EPS) was also conducted through the long-term...
A new process of enhanced dissolved air floatation (DAF) by pulsed high voltage discharge was studied in this paper. With high voltage discharges, removal rate of some normal water quality indexes were better improved, such as UV254 and CODMn from 0.145 to 0.142 and from 6.2 mg/L to 5.8 mg/L. The turbidity of water after treated with pulsed high voltage discharges was larger than that without discharges...
Three different operation modes were used in vertical flow constructed wetland system treating rural wastewater. The results showed that, low water level operation can provide more oxygen for organic matter and NH4+-N removal, but lack of the anoxic condition for denitrification. Remarkable removals of organic matter, NH4+-N and TN were achieved under the cyclic batch operation. Due to the lack...
A synergetic process for simultaneously filtration and denitrogenation in two cascaded deep beds was studied for advanced treatment of secondary effluent. Both the deep beds were up-flow and packed with 2 m height of 3~4 mm polystyrene foam pellets. The first bed was assembled an aerator in its bottom for nitration, and the second bed was added methanol in its influent for denitrificaion. When HRT=1~2...
The purpose of this study was to choose a fine chemical to efficiently remove ammonia nitrogen from the ammonia water in AS Process, which provides a new available approach to treat coking wastewater. The experiment adopted "Air Stripping and Adsorption" to remove ammonia nitrogen from the ammonia water, and studied the reaction temperature T, pH, the time of stripping t, the dosage of the...
Water pollution in rural areas or small cities has been a key environmental problem in China. Limited by underdeveloped economy and poor technical capacity, cost- effective and easily operable treatment technologies are highly needed at present, especially for China's western small mountain cities and/or rural areas. An Anaerobic Sequencing Batch Biofilm Reactor (ASBBR) was developed and a bench-scale...
Microbial flocculants is a kind of metabolic products with flocculating activity being produced by microbes and secreted outside of cells, which is provided with characteristics as well as high-performance, non-toxic, no secondary pollution, being widely applied in the field of water treatment. Through summarizing the relevant domestic and overseas research literatures published in the recent years,...
The biosorption of arsenate and arsenite from aqueous solutions by spent grains, a by-product of the brewing process, was investigated. The effects of solution pH, contact time and temperature were studied in batch experiments. The initial removal is rapid and equilibrium was established in less than 180 min. Good correlation coefficients were obtained for the pseudo second-order kinetic model. The...
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