Ya Feng Li

Application of Baffled-Submerged Bio-Film Process in the Treatment of Sewage Wastewater in a Small Town

The process parameters and running effect of baffled-submerged bio-film process applied in the treatment of sewage wastewater were introduced, aiming to improve the broad application of baffled-submerged bio-film process in the wastewater treatment in small towns. An engineering case was taken as an example to describe the process flow, process parameters and sizes of the structures. The character of the designing was explained along with the discussion of the running effect. The running effect shows that sewage wastewater treated by baffled-submerged bio-film process can meet the requirements of Grand B of Primary standard of Discharge standard of pollutants for municipal wastewater treatment plant (GB18918).

The Application of Fluidized Carrier in Reconstruction Project of Sewage Plant

The traditional activated sludge process was transformed into A2O process with fluidized carriers. This technology was applied in reconstruction project of sewage plant. There was no need of altering civil construction. The effluent COD removal reached 95%. NH4+-N removal reached 92.2%. TN of effluent was less than 15 mg/L and TP was less than 1 mg/L. The process run stable and the effluent quality after secondary treatment could reach design standard.

Experimental Study on Treatment of Reactive Gaudy Red X-3B Dye Wastewater by Immobilized Fe3+- TiO2 Photocatalytic Oxidation

The effect and law of photocatalytic degradation of reactive gaudy red X-3B dye were investigate and the applied process parameters were determined.Using self-synthesized immobilized Fe3+- TiO2 photocatalyst,self-made catalytic oxidation reactor was made to research on reactive gaudy red X-3B dye wastewater by using light source of 20W UV sterilization light.The effects of immobilized Fe3+- TiO2 catalyst content、pH value、Fe3+doping content and adding trace H2O2 on photocatalytic degradation were discussed.The experimental result show that reactive gaudy red X-3B dye wastewater decolorization rate and the removal rate of COD are more than 99% and 90% when the initial reactive gaudy red X-3B dye wastewater concentration was 50mg/L,pH value was 3,input amount of catalyst was 10g/L,Fe3+doping content was 0.5% and the dosage of H2O2 was 0.6mL/L(3%).Immobilized Fe3+- TiO2 photocatalyst can remove the color and persistent organic pollutants in reactive gaudy red X-3B dye wastewater effectively.

Microwave-Ferrous Sulfate Modified Activated Carbon Adsorption Study on Phosphorus Removal

Using microwave-ferrous sulfate modified activated carbon adsorption manner to remove the high concentration of phosphorus in wastewater. The power of microwavethe concentration of ferrous sulfate and reaction time on phosphorus removal were studied. When the power of microwave was 425W,the concentration of ferrous sulfate was 0.1mol/L,reaction time was 50 min,the removal rate of TP reaches 95.67%,the treated effluent TP can be dropped to 0.48mg/L,the TP can reaches the first effluent standard of TP in the comprehensive wastewater discharge standard (GB8978-1996).Microwave-ferrous sulfate modified activated carbon is adapted to treat high concentration phosphorus in the wastewater.

The Influence Factors of Phenol Wastewater by Complex Three-Dimensional Electrode Polarity Treatment

In order to study the influence factors of complex three-dimensional electrode polarity to treat phenol wastewater .Set the mixed phenol wastewater as the research object, by the test of static, adopt complex three-ensional electrode polarity to phenol wastewater. When the wastewater is 10 L,quality concentration is 300 mg/L, the pH value is 3.0, the reaction time is 90 min, electrolytic voltage is 15V, plate spacing is 10 cm, Na2SO4 electrolyte additive concentration is 1 g/L, Fe2+ additive concentration is 0.6 mmol/L, aeration intensity is 0.2 m3/h, removal rate of phenol and COD reached 80.99% and 80.99% respectively . The experiments results show that the pH value, reaction time, electrolytic voltage, plate spacing and aeration intensity has a significant effects on phenol wastewater through complex three-dimensional electrode polarity treatment.

Experimental Study on Photocatalytic Oxidation of Reactive Gaudy Red-3B Dye Wastewater by Microwave Enhanced TiO2/AC Photocatalyst

Using microwave enhanced TiO2/AC photocatalyst to photocatalytic oxidation reactive gaudy red dye wastewater.Inspected the influence of the microwave irradiation time and microwave power on the preparation process, and comparative study the influencing treatment effect factors like the initial concentration of wastewater, photocatalyst using times and photocatalyst dosage.The results showed that:the irradiation time is 1min on 520W ,the photocatalyst activity is the highest . The initial concentration of wastewater is 50mg/L, 10.0g/L of dosage, the best decolorization rate is 95.6%, Compared to the no enhanced, the improvement for photocatalyst increased by 8.7%., indicating that the microwave enhanced TiO2/AC photocatalyst can effectively improve the treatment effect of dye wastewater.

Research on the Start-Up of Anaerobic Ammonia Oxidation and the Influence Factors Experiment

Experiment studies the startup of Anammox and the effect of pH and temperature on the denitrification performance of Anammox. We take the UASB reactor for Anammox startup experimental study, and study the removal of NH4+-N and NO2--N under different temperature and pH. Controlling the influent NH4+-N/NO2--N concentration ratio is 1:1.32, the initial concentration of NH4+-N is 50 mg/L, then increase NH4+-N concentration with gradient of 50 mg/L.We detect the influent and effluent NH4+-N and NO2--N and effluent NO3--N concentration .We also Control the temperature (20°C~40°C) and the pH (6.0~9.0) to study the influencing factors. The optimum temperature is 30°C, the removal rate can reach more than 80%, and the optimum pH is 8, the NH4+-N and NO2--N highest removal rate is 82.92% and 87.59%. The effect of the Anammox reaction can be efficient promotion of denitrification and provides theory basis, which provides reference for engineering application on actual conditions.

Study on Treatment of Acid Scarlet GR Wastewater by Coupling System of K2FeO4 –PAFC

Using Ferrate (K2FeO4) and polymer flocculant PAFC (PAFC) Collaborative approach, deal with the Acid Scarlet GR Wastewater. Study the effect of Ferrate dosage, PAFC dosage, Ferrate dosing time, Wastewater initial pH Value. Results show that Ferrate pre-oxidation can significantly improve the Coagulation for the removal of Acid Scarlet GR. when the initial concentration of Acid Scarlet GR is 25mg/L, Ferrate dosage is 90mg,PAFC dosage is 13mL,the removal of Acid Scarlet GR is 95.67%.pH on Ferrate removal of Acid Scarlet GR wastewater has little effect. When pH value is 4-8, the removal rate can reach more than 92%.When pH value is 5.6,the removal rate is the highest.

Study of the Nitrogen and Phosphorus Removal Effects in SBBR by Microbial Immobilization Technology

This study filled polyurethane foam in SBR as micro-organisms immobilized carrier, formed a sequencing batch biofilm reactor (SBBR). It applies the immobilized microbial technology to SBBR, under the A/O operation mode，we cultivate them in order to study the effect of the technology of nitrogen and phosphorus removal in the domestic sewage. The carrier which was used in the SBBR, created aerobic - anoxic - anaerobic micro-environment in space, and appeared a good performance of simultaneous nitrification and denitrification (SND). The results show that adding this kind of carriers in SBBR, successfully achieved a goal in the field of nitrogen and phosphorus removal. The average removal rates of CODCr, NH4+-N, TN and TP is respectively 84.23%、96.94%、58.40% and 91.38%.

Treatment of Wastewater Containing High Concentration Ammonia-Nitrogen by Electrochemical Oxidation Process

The simulant wastewater containing high concentration ammonia-nitrogen was treated by electro-chemical oxidation process in intermittent experiment. The influences of different factors including plate distance,current density, chloride ion concentration and initial pH on ammonia-nitrogen and total nitrogen removal were studied.According to the results of the test, the optimal reaction condition was determined as follows: plate distance was 40mm，current density was 90mA/cm2，chloride ion concentration was 8000mg/L, initial pH was 10。Under the above condition,the total nitrogen concentration reduced from 2000 mg/Lto 280mg/L when the reaction time was 8h, and the removal rate reached 86%. As we can see, the effect of the treatment is quite positive.