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Due to the severe pollution taken place in Taihu Lake, the investigation of water source quality in Taihu Lake is urgent for the development of drinking water treatment processes. Water samples taken from two water source areas in Taihu Lake were analyzed. The results showed that ammonia, TN, TP and CODMn were the dominant contaminants. The concentrations of those contaminants all exceeded “surface...
This article describes a pulsed arc electrohydraulic discharge reactor for the treatment of contaminated pond-water and a detailed study of fundamental characteristics, including plasma parameters, pressure wave propagation, optical emission spectrum and the decay time of the radicals is discussed.
A new method for Nitrate-N removal in water has been presented in this paper, and related experiments have been carried out to study its technical characteristics. Results showed that in designed electrolysis system, Fe modified Ti substrate cathode can catalytic reduce NO3--N to NH4+-N under suitable conditions. Furthermore NH4+-N can be oxidized to N2-N in same system by supporting of Cl-. Under...
Batch adsorption equilibrium experiments and continuous flow breakthrough experiments were conducted to compare the effectiveness of 7 granular activated carbons (GACs) in removing trichloroethylene (TCE) from groundwater. The order of GACs' adsorptive capacities for TCE was in the same order of their phenol numbers (indicator for internal surface of <;1 nm micropores). A small amount of methanol...
Endocrine Disruptors, which is trace but more and more noted in aquatic environment, has a significant effect on people's hormone systems. The estradiol (E2) was a research object, and the effects of solution parameters (concentration, pH, ionic strength and natural organic matter (NOM) ) on the retention of trace E2 by nanofiltration membrane (NF) (BDXN-90 polyamind aromatic compound membrane) filtration...
Since humic acid from water causes considerable serious health-risk factors, powerful methods for the removal of those have received increasing attention over the past decade. In this paper, the available technologies for removal of humic acid from water are briefly reviewed, and the recent advancements are summarized. Fundamentals and main applications of typical methods such as filtration, flocculation...
Ammonia addition and pH depression can inhibit the formation of bromate in ozonated drinking water by reacting with free bromine (HOBr/OBr-), an intermediate in bromate formation, to form bromamines and other bromoorganic disinfection byproducts. This study was performed to assess the effects of ammonia and pH value combinations on the formation of bromate and THMs during ozonation and chlorination...
This article describes the design and construction of a refitted hydraulic press used for water hyacinth dewatering. The performance under different pressures of the press was investigated. The press system mainly composed five parts: support frame, round press plates, cylindrical sieve vessel, collection bucket and hydraulic power system. When the pressure increased from 10 MPa to 35 MPa, the residues...
Ultrafiltration technology hold great promise to provide better water quality, especially for stringent requirements and thus the basic characteristics of ultrafiltration membrane was introduced and its advantages and disadvantages were discussed in this paper. Ultrafiltration membrane fouling mechanism, the factors affecting membrane fouling, and membrane pollution control measures were summed up...
The variation of Assimilable Organic Carbon (AOC) during the coagulation of raw surface water and synthetic water by Al2(SO4)3 was investigated. It was found that the removal rate of AOC concentration during alum coagulation of raw surface water was about 49.5% at high coagulant dosages. The AOC of water decreased efficiently during coagulation in the case of synthetic water at lower coagulant dosages,...
As the reactions of plasma particles produced by pulse discharge in water are complex, the software CEA2 is employed to simulate and compute the content of each species of product in the plasma channel by converting discharge energy into enthalpy. The respective content of OH and H2O2 is measured by chemical methods in the self-developed reaction device. It is found that experimentally-detected concentrations...
Pulsed arc electrohydraulic discharge process (PAED) has been studied for the removal of some of organic pollutants. Firstly, the destruction of para-chlorophenol by PAED system was studied under some different experimental conditions (ionic strength, pH, conductivity and organic initial concentration) in a 5.6-L reactor with the following configuration: 2.9 kV of potential, 140 muF of capacitors...
This paper presents experiments conducted using a high voltage pulsed spark plasma discharge having the following parameters: peak-to-peak voltage 25 kV, peak-to-peak current 400 A, pulse duration 1.8 mus, frequency 1-50 Hz and energy per pulse 2 J. This study demonstrates that a rather low energy input of 75 J/L of water is required to obtain a one-log reduction in Escherichia coli concentration...
Compounds of mercury, chrome and arsenic are very dangerous to man due to their instability and their interaction with fats, providing long periods of partial ejection, i. e. the time during which half of the agent assimilated with the organism ejects or destructs. Hence, the control of mercury, chrome and arsenic content in the water is very critical. In this paper, the sorption capabilities of the...
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