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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,...
To explore the feasibility of ORP as the control parameter of one-stage completely autotrophic nitrogen removal system, this test studied the synthetic low C/N waste water, analyzed the correlation between the variation rule of concentration of ORP and the transfer of nitrogen compounds in system under different concentrations of DO. Results indicated that the ORP curve emerged a turning point when...
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...
The pilot plant study comprised the sequencing batch reactor (SBR) operational mode of a contact oxidation filtration separation integrated bioreactor (CFBR) for treating municipal wastewater. The CFBR was made up of an upper biofilm reactor and a lower gravitational filtration bed. Polyacrylonitrile balls (50mm diameter, 237 m2/m3 specific surface, 90% porosity, and 50.2% packing rate) were filled...
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 order to evaluate the electrolytic decomposition process of ammonia, the effects of current density and chloride ion were investigated. The Ti/RuO2- Pt electrode was used as the anode, and Ti electrode as the cathode. The current densities, of 5mA/cm2, 10mA/cm2, and 15mA/cm2, were applied during electrolysis. It was indicated that the ammonia-nitrogen removal efficiency increased with the current...
In order to reach a bigger NO2-/NO3- value in post-processing of biological shortcut nitrification, the pretreatment of the ammoniac wastewater was carried out using TiO2 photo-catalysis, and the optimizing reaction conditions were obtained. The results showed that after TiO2 pretreatment the NO2-/NO3- value in the wastewater was greater than 2 through adjusting the pH value of reaction solution,...
The shortcut nitrification was realized in a sequencing batch reactor (SBR) when the temperature and pH value were controlled at 28~30degC and 7.8~8.1. The nitrogen removal loading reached 0.129 kg NH4+-Nldrkg-1 VSSldrd-1 by increasing the influent ammonia concentration. More than 85% of the nitrite accumulative efficiency was achieved and the ratio of ammonium oxidation bacteria to nitrite oxidation...
This paper investigated the effect of ammonia-nitrogen to the removal of phenol by electrochemical oxidation in the Chloride System. The electrode of RuO2-Pt/Ti was used as the anode and a Ti plate as the cathode. The results of cyclic voltammetry experiments showed that the RuO2-Pt/Ti anode had no effect of the direct oxidation for both phenol and ammonia- nitrogen, which suggested that the intermediate...
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