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In order to investigate the feasibility of treatment of dairy farm wastewater by constructed wetland and to provide the operation parameters for a full scale constructed wetlands to improve the quality of effluent water, A pilot test was conducted with a plug flow constructed wetland to treat dairy farm wastewater in Ji'nan city. The results show that, under influent loading rate 3m3·d-1, the average...
Molasses alcohol wastewater was treated by the micro-aerobic hydrolysis and acidification process as a pretreatment process. The COD removal rate increased quickly at the beginning of the reaction and then very slowly. The COD removal rate and the acidification rate reached the maximum at the aeration rate of 20mL/min. The acidification rates at different pH values increased firstly with the increasing...
Denitrifying phosphorus removal is a kind of new efficient technology, and can alleviate the contradictions of urban sewage with low-carbon sources. This research took wastewater from a sewage treatment plant in Beijing as study object. Results showed that there was obvious phenomenon of denitrifying phosphorus removal and this phenomenon was gradually strengthened in A2/O process.
To evaluate the feasibility of ultrasonic regeneration of granular activated carbon (GAC) used in wastewater treatment, we used ultrasound to regenerate GAC which was used to adsorbed low concentration sewage. The ultrasound with different power, frequency and irradiation time was used to regenerate GAC which treated sewage with the concentration of about 25mg/L. The experimental results indicate...
The excess sludge of wastewater biological treatment, as refractory compounds, only 25-40% of which could be biodegraded. While much research work has be done about the application of sludge, there were concerns about the application of biosolids due to risks associated with disease, odor, nutrients and the presence of toxic metals. Recently, many studies have focused on sludge reduction technology...
A new type of effective coagulant Microbial Flocculants was prepared from A- spergillus oryzae and used as coagulant in the treatment of papermaking wastewater. The experimental results showed that it had a good coagulation effect in the treatment of papermaking wastewater in a wide range of pH value. The removal rate of SS and CODCr was 97% , 81 % respectively in the condition where temperature was...
Anoxic/aerobic (A/O) membrane bioreactor (MBR) process, which is based on the MBR technic, is an effective method of wastewater treatment. In this study, two chief operation indexes of A/O MBR system are studied and optimized. The final results shows that, under the operation condition that the HRT rate between anoxic and aerobic zone is 1:3 (which in this system is: 4.5h in aerobic zone, 1.5h in...
This paper suggests a technological process to oxidize stench sulfide wastewater containing dodecyl mercaptan with electrolyzing NaOH in the presence of active carbon. Preliminary experiments were conducted and good results were obtained. Under the condition that electrolyzing 1% NaOH with 3A current and the reaction temperature remains 20°C and the reaction time lasts 10~30 s, the stench dodecyl...
Leachate from gangue is known as the main pollutants source to mining area soil and groundwater pollution. Long term leaching experiment are carried out to seek the long term effect on leachate chemistry of gangue under long term exposure to rainfall and atmosphere. Gangue from Xishan coal mine is used for long term dynamic leachate to analyze and compare the changes of the various metal ions in leachate...
A ternary composite was prepared from Polyaspartic acid (PASP), polyepoxysuccinic acid (PESA) and aconitic acid-acrylic acid copolymer (AA-AA). The performances of scale inhibiting, dispersion and biodegradability of the ternary composite in different mass ratio were studied. The results showed that when the mass ratio m(PASP):m(PESA):m(AA-AA) was 1:1:2, the scale inhibition on calcium carbonate was...
Anaerobic biological technology has been widely applied in the treatment of low-concentration organic water recently. However, there are no successful engineering cases of using anaerobic reactors to treat municipal wastewater because of its low efficiency. This paper puts forward the technological process of using unequal spaced opposite floded plate Reactor to treat municipal wastewater. Through...
A preliminary study using gamma radiation on coking wastewater samples was carried out. Chemical oxygen demand (COD), biochemical oxygen demand (BOD) and Ammonia-nitrogen content results were obtained at different doses (1.0, 3.0, 5.0 and 7.0 kGy). As increase of the absorbed doses, a decrease of COD and BOD was observed after irradiation, whereas at the doses of 5 kGy and 7 kGy, the residual concentrations...
Six isolates obtained from diesel oil enrichment culture were reconstituted to form a mixed microbial consortium. And the biodegradation test of diesel oil was conducted at 28°C over 5 weeks. An antibiotic selection strategy was adopted to determine the magnitude of specific isolates and population dynamics within the mixed culture during diesel oil biodegradation. During biodegradation test, the...
Abstract-Acidibility and acidifying degree were important indicators for acidification process in anaerobic digestion. Four factors affecting acidibility and acidifying degree termed temperature, sludge inoculum, mixing speed and substrate concentration were investigated on the basis of an orthogonal test. The order of the four factors affecting the acidification process was temperature > sludge...
Two different leachates of Chang'an landfill in Chendu were collected as the object of study. The components of organic pollutants in leachates were detected by combined GC-MS technique based on the general water quality analysis. Test results of study are as the follows: the type and nature of organic pollutant effect directly on leachate biodegradability. In high biodegradability (BOD5/CODCr = 0...
Shells are waste products from mariculture that presents a major disposal problem in coastal regions in China. While based on previous researches, shells can be used as carrier in Aerobic Bio-filter (ABF). It was investigated in present research that the role of shell for wastewater pH adjustment and alkalinity releasing through static experiment. Under the wastewater and shell volume ratio of 9:1...
The avain feather is natural polymer material resources. It includes large quantity of keratin, among of which proteins take up 83%. The feathers modified by methyl methacrylate at Ammonium Persulfate(APS)-Sodium Bisulfite(SBS) as initiator are applied to treat chrome tanning waste water. The factors such as dosage, pH of chrome tanning waste water, adsorption time were discussed. The adsorption conditions...
The partitioning of 13 kinds of representative endocrine disrupting chemicals (EDCs) between liquid and solid phases of wastewaters in a sewage treatment plant (STP) were studied. It was found that almost all EDCs' partition coefficients (Dp) between aquatic and solid phases have been observed to have a negative relationship with the concentrations of suspended solids (SS) and dissolved organic carbon...
The pollution would be made during the procession of Soy Protein Concentrate. In the waste of SPC, there are protein due to defferrent alcohol destiny. To recovery them effectively, the paper studied systematically the effect of different alcohol concentrations on the molecular weight of soybean protein concentrate in the extraction which was determined by SDS-PAGE electrophoresis and dissolution...
Microorganisms can photoreactivate after ultraviolet radiation on the effluent from WWTP. The effect of ultrosonic pretreatment collaborating to control E. coli' s photoreactivation by UV disinfection is studied in this essay. It is found that there is a good linear relationship between UV irradiation dose and E. coli' s inactivation rate, and the interrelated coefficient is 0.99. When US collaborating...
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