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Due to the difficulty of oilfield produced water treatment and low efficiency of coagulation technology. A more efficient treatment technology was necessity. Produced water treatment by ozone enhanced coagulation was investigated in this study in order to develop a new method for oilfield produced water treatment. The results showed that addition of ozone could reduce the dosage of coagulant (PAC)...
Conventional drinking water treatment plant consists of coagulation, flocculation, sedimentation, and filtration and disinfection units. Depending on water quality influent, each unit can be optimized to achieve the desired water quality effluent, both in design and operation stages. A typical water treatment plant has the combination of processes needed to treat the contaminants in the source water...
Polyaluminium chloride (PAC) was adopted as coagulant to treat the high algae-laden water containing lots of cells of Microcysits aeruginosa (MA) by jar test of cogulation/flocculation/dissovled air flotation (C/F/DAF) process. The constant flocculation and the tapered flocculation with two steps were used in C/F stage. Two-dimension fractal dimension (D2) and strength factor (SF) were respectively...
The mathematical models of each process link consumption in water purification systems were established by means of the mechanism method, and the model for optimal coagulant dosage was given by setting the sum of those units as the objective function. To take into consideration large time delay and disturbance characteristics in the coagulation sedimentation process, a forward-feedback control method...
Study on coagulation-microfiltration combination process for treatment of Luan river water was carried out. The experimental results showed that when the dosage of FeCl3 was 35 mg/L, the removal of turbidity was above 95%, the organic matter was above 50%, and recovery of membrane flux reached 81% for the combination process. On the other hand, among the four coagulants (FeCl3, Polymeric Ferric Sulfate,...
Chitosan can be a potential substitute for aluminum salts and synthetic polyelectrolytes in water treatment because it can: (1) avoid the health effects from residual aluminum (III) and synthetic polymers; (2) produce biodegradable sludge; and (3) reuse the crab shell. In this study, the chitosan flocculation characteristics in water were studied firstly, and then the combined flocculation of chitosan...
The performance of pilot scale hybrid process of fluidized biofilm process, chemical coagulation and ultrafiltration system for surface water treatment was studied. In order to remove ammonia nitrogen (NH4+-N) and DOC efficiently, fluidized biofilm process with entrapped nitrifying bacteria pellets and powder activated carbon was applied to the hybrid process. FeCl3ldr6H2O and 7 mg (Fe)/l were determined...
Treatment of slightly-polluted surface water by Electrocoagulation-Microfiltration (EC-MF) was studied. The factors influences on removal efficiencies of TOC, NH3-N and oil, such as current density, electrolytic time and pH value had been investigated. Based on the optimize experiments on the single factor, Xuzhou section of Beijing-Hangzhou Canal water was cleaned by EC-MF. The results showed that...
Cyclops of zooplankton threatens the drinking-water security because of the massive propagation in the polluted water resource and the ineffective treatment by conventional purification technology. The inactivation effects on Cyclops in the raw water of the pre-oxidants, such as chloramines, chlorine, potassium permanganate composite (PPC) and ozone, were discussed. And the synergic removal effects...
The dynamic membrane formation mechanisms and filtration mechanisms were investigated at 4 cm and 8 cm water head drop (WHD). Flux variation, resistance plot curve shape, the relationship t/V - t and t/V - V were investigated to study the dynamic membrane formation and filtration. And effluent turbidity and particles size distribution were also used to demonstrate the effluent particles size. Based...
The performance of pilot scale combined process of fluidized biofilm process, chemical coagulation and ultrafiltration system for surface water treatment was studied. In order to remove ammonia nitrogen (NH4+-N) efficiently, fluidized biofilm process with entrapped nitrifying bacteria pellets was applied to the combined process. FeCl3-6H2O and 6 mg (Fe)/I were determined as optimal chemical coagulation...
UF (ultrafiltration) technology has been in progress as an alternative to conventional drinking water treatment of raw water which usually contains algae both in domestic and abroad. But fast decrease of membrane flux and ineffective backwashing are major limitations for application of UF on algae-rich water. Pretreatment by permanganate/PAC (powdered activated carbon)/coagulant and a better range...
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