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A simplified activated sludge model (SASM) was proposed, which based on the activated sludge model No.1 (ASM1). This model describes the carbon oxidation process, nitration process and denitration process. The amount of components and processes of the SASM is fewer than that of the ASM1, so the practicability of the SASM is enhanced. Using the SASM to simulate the DMBR by Biowin, the results showed...
In this paper, nanosized TiO2 modified ultra-filtration membrane catalyzed ozonation is studied. Firstly, the mechanism of TiO2-catalyzed ozonation process is confirmed and it was also observed that catalytic ozonation were significantly influenced by tert-butyl alcohol, which testified that nanosized TiO2 catalyzed ozonation of organics follows a radical-type mechanism. In comparison of ozonation...
A kind of technology and process of treating printing and dyeing wastewater with high efficiency and low energy consumption was presented. Based on the analysis of the current methods, this article summed up the more practical way, combining theory with practice, to provide some references for the similar projects.
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 raw water was diluted in four levels of 20%, 40%, 60%, 80% in the bio-membrane initiating process. When the raw water concentration was invariable , and hydraulic retention time, dissolved oxygen, pH and water temperature were 3 h, 3.5 mg/L, 7.05 ~ 8.23, 17.4 ~ 30.6°C respectively. Results showed removal rates of combined packing to COD, BOD5, NH3-N and TP were about 76.3%, 78.4%, 74.9% and 58...
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...
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...
An experiment of a reformative MBR process that a combined process of "biological contact oxidation and micro- filtration (MF) membrane" was conducted for the treatment of aquatic products processing wastewater. The experiment results showed that the combined process for waste water the reduction rates of the CODCr reached 95%, and NH4-N was in the range of 40~50%. HRT played an important...
Bio-media was one of the major factors that affect the performance of bio-contact oxidation. Two kinds of Bio-medias were compared from the effects of different bio-media on bio-contact oxidation reactor. The results showed that, the dosage impact on web-like filler was bigger than combined filler, for web-like filler, when the dosage rate was optimum, the oxygen transfer rate increased with the dosage...
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