Advanced Materials Research Vols. 955-959

Abstract: The intermittent aeration strategy was applied to the sequencing batch biofilm reactor (SBBR) for the enhanced treatment of urban sewage. Ammonia oxidizing bacteria was cultivated by inoculation. After 25 days cultivation shortcut nitrification was successfully achieved and nitrite accumulation rate could be up to 93%. In the start-up phase of shortcut nitrification, intermittent aeration could increase production of nitrite and promote the enrichment of ammonia oxidizing bacteria. It was concluded that temperature could affect nitrite accumulation. When temperature is in 25~35°C, the nitrite accumulation rate could be up to 90%.

Abstract: The process technique and design parameters of project of Solar Ozonic Ecological Sewage Treatment Plant (short for SOESTP) which consists of anaerobic reactor, horizontal subsurface flow (HSSF) constructed wetlands(CWs) and the combination of solar power and ozone disinfection are described, the paper further examines the removal efficiency for treating rural domestic sewage, running expense and recycling ability of product water. The results show that the average percentage removal values of CODcr，BOD₅，SS，TN，NH₃-N，TP range from 95.6% to 98.0%, 96.0% to 98.7%, 93.1% to 96.1%, 97.0% to 98.9%, 96.9% to 99.5%, 98.2% to 99.6%, respectively, the reduction of fecal coliform (FC) reaches 99.9%, the effluent quality meets the first level A criteria specified in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant（GB18918-2002）. The running cost of SOESTP is 0.063yuan/ m³, saves much more than traditional sewage treatment, and the ozone water obtained from the reservoir will be an ideal choice for disinfection .The system has characteristics of easy manipulation, low operating cost, achieving advanced water, energy conservation and environment protection, is thought to be very suitable for use as the promotion of rural small - scale sewage treatment.

Abstract: The advantages and disadvantages of the conventional desalination methods were discussed. A four-effect desalination demonstration plant using waste heat from a diesel engine was designed. Not only the water yield but also the physical dimension of the distiller has been calculated under the operating condition. The analysis of energy consumption shows that the desalination system is low-cost.

Abstract: The paper presents an intelligent irrigation remote control system based on Internet of things to improve the calculation accuracy in water-saving irrigation. A set of fully functional website remote irrigation control system, SMS remote automatic irrigation control system, and the Android platform developed based on the mobile phone Java automatic irrigation remote control mobile client are designed, as well the precise irrigation water control machine and the remote control function are develop. It can realize the field of real-time information acquisition, monitoring, irrigation schemes, precise control machine remote monitoring and water at the scene of the greenhouse temperature and humidity regulating function through the browser, telephone, SMS, fetion and mobile phone client. Its practical application in the agricultural demonstration fields shows that this system is suitable for large acreage fields with its stability in running, convenience in operation and low cost in use.

Abstract: Comparative study on permanganate and ozone as pre-oxidation agents were performed on pilot scale with traditional drinking water treatment process, chemical oxygen demand (COD), total organic carbon (TOC), UV₂₅₄, turbidity, trihalomethane formation potential (THMFP) were examined at each reactor’s effluent. The results show that at pre-oxidation reactor, the total organic remained stable after by the two agents, while for UV₂₅₄, pre-ozonation has a removal rate of 34%, comparing that of 17% by permanganate. At the sedimentation process, 0.4 mg/L permanganate improves the removal rate of turbidity and COD by 0.99 % and 8.4%, respectively; while a positive COD removal of 11.8 % was achieved by 0.9 mg/L pre-ozonation, and an average of-10.08% turbidity removal was achieved at applied dosage (0.5, 0,9 and 1.5 mg/L), which can be made up for in the followed sand filtration reactor. Both permanganate and pre-ozonation show higher removal rate of THMFP for the finished water.

Abstract: In order to understanding of the fate and transport of TiO₂ nanoparticles (NPs) in the water treatment process, this study focused on the particle surface characteristics and hydrodynamic properties at different humic acid (HA) concentration, using aluminum sulfate (AS) as a coagulant. The changes of zeta potential of humic acid capped TiO₂ NPs and flocs were measured by Malvern Zetasizer nanoZS. The surface functional group of flocs was investigated using FT-IR spectra. The growth velocity of alum-TiO₂ NPs flocs were determined using a small-angle light scattering technique during the coagulation process.Experimental results indicated that the zeta potential of alum-TiO₂ NPs flocs surface after adsorption of humic acid was related with humic acid concentration. Adsorption of humic acid resulted in more negative electrophoresis on the surface. Size and growth velocity of alum-TiO₂ NPs flocs were estimated at different humic acid concentration. It was found that the flocs growed were faster in the presence of humic acid, while humic acid had adverse influences on the growth of alum-TiO₂ NPs flocs.

Abstract: A case study of water using network of a coal to methanol plant was under taken with an aim to reduce freshwater consumption, and the accumulated water pinch was employed for minimization of freshwater consumption. The problem was identified as a single contaminant, reuse directly problem. The limiting constraint (i.e. COD) was identified based on the investigation of water quality. A nearest neighbor algorithm (NNA) was used to distribute the fresh water and reuse water among each of operations. The results showed that the flow rates of freshwater and wastewater could be decreased by 24.2% and 86.7%, respectively.

Abstract: Canal system conveyance efficiency (CSCE ) is a basic parameter of engineering construction and water management of the irrigation districts, either the response of operation status of an irrigation canal system. It plays great significance in searching quantity relationship between ICSCE and other basic parameters reflecting the condition of irrigation engineering. This paper, gravity irrigation districts in Zhejiang province as an example, sets up the relationship between basic parameters such as irrigation canal lining rate, canal flow and the CSCE, based on determining the CSCE in 61 typical gravity irrigation districts. And it also reflects the influence of basic parameters on CSCE, having a certain accuracy. This result plays a positive role on the further research and actual work on CSCE.

Abstract: Shaoxing has used three water supply models, i.e. urban water supply network extension, township water factory centralized water supply, and mountain area scattered independent water supply, to improve the drinking water conditions for its 2.075 million rural dwellers. Nevertheless, there still exist problems in its water supply systems, such as difficulties in protecting water sources, small and scattered operating entities, and uneven water supply facilities and water qualities. This dissertation therefore brings forward countermeasures such as optimizing project planning and layout, implementing standardized renovation and improvement, practicing the most stringent water resources protection system, and establishing and improving the management system and testing network.

Abstract: Based on the statistical pattern recognition theory, the AMRA timing analysis methods are used in the article, through the combination of long autoregressive model residuals method and the least squares method the model parameters are estimated, and a system model is established. By using mean control chart method the vibration information and feature of the pressure pipe are extracted and selected, so whether the pressure pipes is damaged can be judged effectively. The simulation results show that structural abnormalities test method of the mean value ,which is Based on the recognition theory of statistical pattern, can accurately diagnose structural damage detection state ,the injury degree and damage location, it has a very strong sensitivity