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Search Results: 1 - 10 of 12542 matches for " Hao Xiaodi "
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Experimental study on enhancing nitrogen removal by effluent recirculation in a BAF reactor with crushed lava packed as carriers

Hao Xiaodi,Wei Li,Qiu Fuguo,

环境工程学报 , 2009,
Abstract: It was demonstrated in a pilot experiment that crushed lava was good carriers in an up-flow biological aerated filter(UBAF).The removal efficiencies of COD,SS,and turbidity were not affected by effluent recirculation,and moreover the efficiency of nitrification was not enhanced too much due to the effect of low temperature during the experiment,but the removal efficiency of total nitrogen(TN) was indeed enhanced by effluent recirculation.Up to effluent recirculation at R=150%,NO-3 converted from nitrificati...
Modeling and experimental study on enhancing effect of BNR by phosphate recovery in side-stream of anaerobic supernatant

Hao Xiaodi,Yi Lankai,Fu Kunming,

环境工程学报 , 2013,
Abstract: 以实验室营养物(BNR)去除工艺为研究对象,通过模拟预测与实验验证,对侧流磷回收强化低碳源污水脱氮除磷效果的影响进行研究。实验结果与模拟预测均显示,在低碳源生活污水(BOD5/TKN=3.2,COD/TKN=4.8,COD/TP=48.9)前提下,厌氧上清液侧流磷沉淀/回收可以使得出水氮、磷达标(TP≤0.5 mg P/L、TN≤15 mg N/L)。研究结果表明,侧流磷回收可以相对提高后续生物脱氮除磷所需C/N、C/P比,从而强化低碳源污水生物营养物去除效果。模拟预测与实验验证几乎一致的结果表明,数学模拟技术完全可以取代传统实验,对所关心的工艺运行问题进行准确预测。
Evaluating the reliability of original data from wastewater treatment plants

HAO Xiaodi,HU Yuansheng,WANG Kewei,

环境科学学报 , 2009,
Abstract: Based on a lab-scale BNR (biological nutrient removal) experiment,a matrix of mass balances was set up and a set of original operational data was checked for their reliability with the help of the Macrobal software program. The calculation of mass balances could not only check gross errors,but also accurately determine the SRT. Moreover,the fluxes of COD oxidation(OCCOD),nitrification(Qnitr),denitrification(Qdeni)and the net consumption of oxygen (OCnet)could be calculated. An accurately determined SRT is key to making good model predictions; Qdeni can be a reliable reference for calibrating the denitrification process and OCnet can be used for final verification of model calibration.
Enriched experiment and endogenous characteristics of polyphosphate-accumulating organisms(PAOs)

WANG Qilin,HAO Xiaodi,CAO Yali,

环境科学学报 , 2010,
Abstract: By means of measuring maximal anaerobic phosphate release rates (PRR), analyzing 16S rRNA with fluorescence in-situ hybridization (FISH) and observing membrane integrity by live/dead staining, the aerobic decay characteristics of polyphosphate-accumulating organisms (PAOs) in a biological nutrient removal (BNR) system and an enriched PAOs sequencing batch reactor (SBR) system were investigated. It was experimentally determined that a highly enriched culture of PAOs (91%) was obtained in the enriched PAO-SBR system by alternating the carbon source in the feed between sodium acetate trihydrate and propionate over a 36 d switching cycle, i.e., sodium acetate trihydrate (24 d) and propionate (12 d). The experimental results and calculations revealed that the decay rates of PAOs in the BNR and enriched PAO-SBR systems were 0.113 d-1 and 0.181 d-1, respectively, and the death rates were 0.048 d-1 and 0.036 d-1. In addition, the results also demonstrated that cell death contributed 42% and 20%, respectively, to the cell decay in the BNR and enriched PAO-SBR systems. In other words, the activity decay accounted for 58% and 80% of the total cell decay. For this reason, cell death was not a major factor causing the cell decay of PAOs, but activity decay was mostly responsible for this process.
Review of pretreatment technologies for excess sludge

Hao Xiaodi,

环境科学学报 , 2011,
Abstract: Energy production from excess sludge of biological wastewater treatment by anaerobic digestion has been once again emphasized after the Copenhagen summit conference on the global climate change. Disruption and/or hydrolysis of bacterial cells is a bottleneck limiting the efficiency of anaerobic digestion, but suitable pretreatment for excess sludge could enhance disruption and/or hydrolysis of bacterial cells and thus explore greatly the potential green energy from excess sludge. Nowadays, there have been many pretreatment technologies of excess sludge available in the world. Among them, many pretreatment technologies, such as ultrasonic and focused pulsed methods, have been already applied to engineering. Moreover, there are also some developing technologies, such as thermal hydrolysis and alkaline pretreatment, and biological agents added in excess sludge have been in research and development. With this article, pretreatment technologies are categorized as physical/mechanical, chemical, biological and combined pretreatment methods, which are in detail described for their theories, characteristics, and progresses on R & D and prospects of application.
Comments on quant-ph/0609176
XiaoDi Wu
Physics , 2007,
Abstract: In this note, we show the mistake which has been made in quant-ph/0609176. Further more, we provide a sketch of proof to show the impossibility of the effort of such kind toward improving the efficiency of Grover's Algorithm.
Parallelized Solution to Semidefinite Programmings in Quantum Complexity Theory
Xiaodi Wu
Computer Science , 2010,
Abstract: In this paper we present an equilibrium value based framework for solving SDPs via the multiplicative weight update method which is different from the one in Kale's thesis \cite{Kale07}. One of the main advantages of the new framework is that we can guarantee the convertibility from approximate to exact feasibility in a much more general class of SDPs than previous result. Another advantage is the design of the oracle which is necessary for applying the multiplicative weight update method is much simplified in general cases. This leads to an alternative and easier solutions to the SDPs used in the previous results \class{QIP(2)}$\subseteq$\class{PSPACE} \cite{JainUW09} and \class{QMAM}=\class{PSPACE} \cite{JainJUW09}. Furthermore, we provide a generic form of SDPs which can be solved in the similar way. By parallelizing every step in our solution, we are able to solve a class of SDPs in \class{NC}. Although our motivation is from quantum computing, our result will also apply directly to any SDP which satisfies our conditions. In addition to the new framework for solving SDPs, we also provide a novel framework which improves the range of equilibrium value problems that can be solved via the multiplicative weight update method. Before this work we are only able to calculate the equilibrium value where one of the two convex sets needs to be the set of density operators. Our work demonstrates that in the case when one set is the set of density operators with further linear constraints, we are still able to approximate the equilibrium value to high precision via the multiplicative weight update method.
Equilibrium Value Method for the Proof of QIP=PSPACE
Xiaodi Wu
Computer Science , 2010,
Abstract: We provide an alternative proof of \class{QIP}=\class{PSPACE} to the recent breakthrough result. Unlike solving some semidefinite programs that captures the computational power of quantum interactive proofs, our method starts with one \class{QIP}-Complete problem which computes the diamond norm between two admissible quantum channels. The key observation is that we can convert the computation of the diamond norm into the computation of some equilibrium value. The later problem, different from the former semidefinite programs, is of better form, easier to solve and could be interesting for its own sake. The multiplicative weight update method is also applied to solve the equilibrium value problem, however, in a relatively simpler way than the one in the original proof. As a direct byproduct, we also provide a NC algorithm to compute the diamond norm of a class of quantum channels. Furthermore, we provide a generalized form of equilibrium value problems that can be solved in the same way as well as comparisons to semidefinite programs.
Experimental study on factors controlling aerobic and anoxic P-uptake in BNR processes

HAO Xiaodi,DAI Ji,LAN Li,ZHANG Luping,

环境科学学报 , 2008,
Abstract: Anaerobic P-release,aerobic P-uptake and anoxic P-uptake are important factors controlling the overall efficiency of bio-Premoval in Biological Nutrient Removal(BNR)processes.Based on a lab-scale BNR process(BCFS),batch experiments were conducted to study the effects of initial anaerobic COD concentrations,carbon sources and HRT on aerobic P-uptake and anoxic P-uptake.Further,the results of P-uptake under aerobic and anoxic conditions are compared.The results from batch experiments indicate that P-uptake increased with increasing influent COD.With glucose used as carbon source,residual PO43- in bulk under aerobic P-uptake in 4h was the lowest among the three tested carbon sources.Using acetate and propionate as carbon sources,however,increased the capacity of the system for continuous uptake of phosphate.Under anoxic conditions,Ordinary Heterotrophic Organisms(OHO)probably limited denitrifying dephosphatation,resulting in a lower anoxic P-uptake rate.The ratios of anoxic P-uptake to total P-uptake were 46.12%,32.03% and 21.96% for glucose,acetate and propionate,respectively,when the initial anaerobic COD concentration was 400 mg·L-1.
Experimental study on factors controlling anaerobic P-release

HAO Xiaodi,DAI Ji,HU Yuansheng,ZHANG Xiangping,

环境科学学报 , 2008,
Abstract: Anaerobic P-release directly controls the total effect of bio-P removal in biological nutrient removal (BNR) processes. Based on a lab-scale BNR process (BCFS), batch experiments were applied to study the effects of initial COD concentrations, carbon sources and HRT on anaerobic P-release. The results from batch experiments indicate that P-release increased with increasing influent COD. The average rates of P-release were not affected by initial COD concentrations if the anaerobic HRT was sufficient. The P-release effect was good as long as the rate of uptake of volatile fatty acids (VFAs) per unit of sludge (VSS) was above 0.04 g·h-1. With glucose used as carbon source, anaerobic P-release within 3 h was less than with acetate and propionate. The final amount of P released in the presence of acetate was lower than that released with propionate, but the reaction time (HRT) required to reach the same amount of P-release within 3 h with acetate was half of that required with propionate.
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