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In this study, the optimum conditions, the decolorization rate and the possible degradation mechanism were explored for the degradation of Acid Red B by the combined technology of ozonation and high voltage pulsed discharge (HVPD). The results suggested that the decolorization rate of the Acid Red B fitted the pseudo-first-order kinetics with initial dye concentration. The optimum ozone dose and pH...
It is summarized the research hotspots of flue gas desulfurization (FGD) and analyzed the advantages and disadvantages of Limestone-Gypsum wet flue gas desulfurization (WFGD) and microbic desulfurization methods. Put forward a new idea of combining the Limestone-Gypsum WFGD, microbial method with catalytic oxidation of transition metal (Fe3+/Fe2+ galvanic couple) reasonably. Then established the model...
Deep understanding of pH variation during biological nitrogen removal is critical for ensuring the effective operation of nitrification/denitrification or nitritation/denitritation processes on a real-time basis. Two tank-type glass vessels, with a 6 L working volume for each, were used as sequencing batch reactors (SBRs) to investigate variation of pH in biological nitrogen removal process (nitritation,...
A lab-scale two-stage UASB-A/O combined process for treating the real municipal waste leachate and a pilot-scale SBR for treating the municipal wastewater were used to investigate the inhibition kinetics of FA(free ammonia, FA) and MLSS(Mixed liquor suspended solids,MLSS) to nitrification rate. Under the premise of achieving short-cut nitrification-denitrification stably (running 130 days) in UASB-A/O...
A modified oxidation ditch process is applied in a full-scale municipal wastewater treatment plant. Compared with the conventional oxidation ditch, the modified oxidation ditch adds some microporous aerators to improve oxygen utilization. The measures bring about a further improvement of nitrogen and phosphorus in the urban wastewater. The monitoring results for one year show that the influent concentrations...
To solve the ultrafiltration water plant's contradiction of high flux and membrane fouling in summer when algae was high, and ensure the water plant security and stable, a pilot testing which using immersion membrane as the core of combined process was carried on. The results showed: preoxidation using potassium permanganat and coagulation could efficiently reduce the number of algae, ultrafiltration...
Rejected unsymmetrical dimethylhydrazine(UDMH) reuse technology abroad have been summarized. Many commercial products were synthesized successfully using UDMH, including daminozide, 1,3,5-triamino-2,4,6- trinitrobenzene (TATB), heterocyclic compounds, organosilicon derivatives, trifluoromethanesulfonic hydrazide, etc. Synthesis process, conditions, principles advantages and disadvantages have been...
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...
Mineral processing wastewater of sulfide ore containing dressing pharmacy such as residual xanthate, resulting in many mine ecological deterioration, serious water and soil pollution, human health, agricultural production and fisheries caused great harm, could easily lead to environmental pollution. Therefore, effective method to remove the residual xanthate of mineral processing wastewater no doubt...
Integrated biological wastewater reactor by a combination of air-lift device and cellular filler reactor was utilized to treat sewage on campus. The experimental results suggest that by vaccinating with an indirect and fast way, COD in effluent water could achieve 32mg/L after 7 days with the removal rates of 63.6%, representing the start-up of reactor. When the air-to-liquid ratio was 16.8∶1, the...
‘Dangshansuli’ pear is one of crisp pears and has a non-climacteric respiratory pattern. With ‘Dangshansuli’ pears which were in different pathological grades of superficial scald as material, the internal physiological indexes were determined to study the physiological change in superficial scald pears. The results indicated that it was obvious positive correlation between the contents of α-farnesene...
In this study, the electro-Fenton system had been established and graphite plates were selected as electrodes. Azo dye methyl orange was used as the model pollutant. The electrolytic bath was divided into cathode cell and anode cell two parts. The two cells were connected by salt bridge. The kinetics of methyl orange decoloration in these two cells was obtained in the optimal conditions. The results...
Effects of different farming patterns on soil organic carbon distribution in profile and oxidation stability in purple paddy soil of long term experiment site (since 1990) were studied. Results showed that the content of soil organic carbon (SOC) decreased gradually with the increase in depth among different kind of treatments. The SOC content, reaching 20.69 g kg−1, in 0–10 cm soil layer with the...
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...
Potassium ferrate (VI) has been considered to be an environmentally friendly oxidant. In this paper, a research on the physiological and biochemical changes of the ferrate (VI)'s acting on Microcystis aeruginosa FACHB-905, a common kind in algal bloom, has been performed. Under the action of ferrate (VI), chlorophyll-a content, the photosynthetic oxygen evolution rate, maximum electron transport rate...
A biomembrane that was used to make a biosensor for detecting inhibitor of ammoia oxidation was prepared by entrapping enriched ammonia-oxidizing bacteria (AOB) in polyvinyl alcohol (PVA). AOB were enriched by fed batch cultivation with using return activated sludge from A2/O process as seed. Enrichment of AOB was confirmed by denaturing gradient gel electrophoresis (DGGE) analysis. The optimum conditions...
A combined internal electrolysis-Fenton technology was used to treat chemical synthetic pharmaceutical wastewater. The combined technology presented a higher COD removal than those by the only internal electrolysis technology. The experimental results indicated the COD removal efficiency by the combined technology could achieve as high as 60% under the conditions that H2O2 concentration was 50mg/L,...
Poxy resin wastewater contained highly COD and toxic organic compound. The application of Fenton reagents oxidation and iron-carbon micro-electrolysis for elimination of organic compound in aqueous solution were investigated separately. The degradation of COD in aqueous solution by Fenton's reagent was studied. After 75 min, the UV254 value drop from 0.92 to 0.35. The 79% removal of COD in water (pH=4,...
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,...
The modified DE Oxidation Ditch Process adopted by the Xindu Wastewater Treatment plant has proven to be a good engineering practice in Wastewater treatment. This article analyses the sewage DE oxidation ditch process and the improvements made at the Xindu plant, concluding with the experience of the removal of nitrogen and phosphors.
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