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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.
To study the treatment of the slaughter wastewater treatment, application of ABR/contact oxidation process of a lab scale was carried out, taking pig excrement as the inoculation source. Research results showed that COD removal rate lied from 72.2 ∼ 94.8% of the entire process, and the anaerobic VFA levels were lower than 400mg/L0 when the water quality fluctuated, the outflow remained stable, which...
Following the introduction of characteristic of wastewater and correlated project in the Alpine Region, the problems were pointed out which should be noticed in wastewater treatment process selection in this specific area. Some suggestions about key design parameters were proposed, and the Two-stage Bio-contact Oxidation Technology was been selected and applied in wastewater treatment plant in north...
This thesis is based on Heishizi landfill lechate treatment, contrapose its limitation, and aim at optimizing Without Biomass Retention Sequential Intensified Pretreatment Reactor's functional parameter and inproving treatment efficiency. Conclusions can be drew that: with HRT's droping, ammonia nitrogen removal rate decrease, and TN removal rate is highest in case of HRT=5.3d; ammonia nitrogen removal...
O3-biological zeolite processes was used to treat micro-polluted raw water, The results show that zeolite modified by NaCl is efficiency on ammonia-nitrogen removal, at pH 6~9 and 150 min stirring time, the ammonia-nitrogen removal rate is 71.2%;During the culture of biofilm, ammonia-nitrogen removal rate of water treated by biological zeolite increased after decreasing. When the biofilm is mature,...
Wastewater treatment practices have been significantly improved since the introduction of novel microbial treatment technologies. The Sequencing Batch Reactor (SBR) system for ammonia removal over nitrite (SHARON) process by intermittent aeration as well as the key parameters of SHARON, were studied in this paper, which includes pH, temperature, dissolved oxygen (DO) and sludge age, to obtain the...
Partial nitrification to nitrite is technically feasible and economically favourable, especially when wastewaters contain high ammonium concentrations. Partial nitrification can be obtained in situations of free ammonia inhibition the nitrite oxidizer but not the ammonia oxidizer. The effects of free ammonia on partial nitrification for treating old landfill leachate were investigated with different...
An expanded granular sludge bed packed with porous sponge was started to treat wastewater contaminated by sulfide, nitrate, nitrite and organic carbon compounds. In inflow wastewater, potassium nitrate and sodium nitrite acted as electron acceptors, sodium sulfide acted as electron donor and glucose acted as organic carbon source. In the anoxic reactor, autotrophic denitrification happened together...
The performance and enhancement of pollutants removal in raw municipal sewage by a new pretreatment process were investigated in this study. The experiments were carried out with a GS sedimentation tank in full scale plant. The results revealed that average removal efficiency of TP, TSS, and TN achieved 49%, 67.3% and 20% respectively during stable running period. TSS removal rate could achieve about...
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 self-designed MBR was added the photo catalyst TiO2 which was immobilized on polyurethane foam (PF) cubes to make a pMBR. The PF cubes can suspend and circulate in the MBR. The photo degradation of dyeing wastewater was optimized by evaluating the effects of different factors, such as, COD, BOD5 concentration, carrier dosage and its microorganisms. The result showed that the photo catalytic oxidation...
The effects of influent substrate concentration load, hydraulic load and total nitrogen load on total nitrogen removal rate were compared in an up-flow ANAMMOX bio-filter reactor. The deep region division and bacterial distribution in the ANAMMOX bio-film were deduced based on the theory of micro-environment and the existence of substrate transfer gradient. In addition, the composition and distribution...
The aim of the investigation was to evaluate the nitrogen removal efficiency by using the combined partial nitrification and anaerobic ammonium oxidation (anammox) process for high-strength ammonium synthetic wastewater. The partial nitrification and anaerobic ammonium oxidation reactors were inoculate with domesticated sludge and operated respectively during the startup period. Subsequently, they...
Starch wastewater has high turbidity and COD, heavy odor after anaerobic processing. Discharging this kind of sewage could cause serious environmental pollution, and therefore it need to be treated and reached the national standard before discharge. This experiment based on the specific characteristics of starch wastewater. The process was designed as follows: after anaerobic hydrolysis prior to degradation...
Azo dyes brilliant red X-3B wastewater simulated were treated by process containing bio-electrochemical hydrolysis-acidification reactor(BEH) and biological contact oxidation process (BCO), and by process containing biological hydrolysis-acidification reactor(BH) and zeolite MBR. The performance of aforementioned two processes was compared. The result indicated that the treatment effect by BEH for...
A multi-population biofilm model for completely autotrophic nitrogen removal was developed and implemented in the simulation software AQUASIM to investigate the stratification and total nitrogen removal characteristics in a membrane-aerated biofilm reactor, which realized the counter-diffusion of the oxygen and substrates. The model considered four microorganisms including AeAOB, AeNOB, AnAOB and...
In this study, according to the specific characteristics of acrylonitrile wastewater, Effective Microorganisms (EM) was used as Contact oxidation strain. The optimum conditions of EM bacteria domestication and contact oxidation treatment, such as pH, concentration and temperature, was confirmed. In addition, the results of aerobic treatment of wastewater suggested that COD effluent reduced to below...
Lead dioxide catalyzed cathode (PbO2) which has high overpotential and electrode potential with low cost was tested in microbial fuel cells (MFCs) for sulfide removal in this study, compared with traditional platinum based carbon cathode (Pt/C). The maximum power density of 997.26±20.20 mW/m2 was realized, with sulfide removal efficiency as high as 88.73±4.37%, both showing advantage to Pt/C cathode...
To determine if anaerobic microniches are created in granular sludge exposed to oxygen where the refractory organics reduction in coking wastewater could occur and to assay the feasibility of the highly efficiently and stable operation of the micro-aerobic EGSB reactor for simultaneous removal of COD and NH3-N treating actual coking wastewater at 25-30°C, both anaerobic and microaerobic operations...
Shortcut nitrification was reported to be technically feasible and economically favourable, especially when sewages with high ammonium concentrations or low C/N ratios are treated. Nitritation can be obtained by selectively inhibiting nitrite oxidizers through appropriate regulation of the systempsilas pH, DO, temperature, and sludge retention time, and so on. Nitrification tests were performed in...
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