The novelty, the originality, predominancy,and usefulness of an AOSD control system and a MEIDENSHA ceramic inorganic matter film

Transcription

1 The novelty, the originality, predominancy,and usefulness of an AOSD control system and a MEIDENSHA ceramic inorganic matter film Yuhei Inamori 2014, 1, Summary of AOSD Control System As opposed to the environmental agent of degradation of an ecosystem like deterioration of the value for water supplies by the eutrophication represented by death and blue-green algae of fishes by dissolved oxygen lack of unwholesomeizing of the environment by the health impairment caused by a water-borne infection disease and a bad smell and a water area, It is the main purposes of effluent treatment to carry out preservation reproduction at the same time it prevents these environmental problems. By the present, in order to attain highly efficiently and highly suspended matter and soluble pollutant removal, such as an organic matter, nitrogen, and Lynn, development of advanced technology is made continually, and an effluent treatment process is developing greatly. In this case, effluent quality is developed for environmental preservation reproduction of a natural water area, it is becoming very important positioning to introduce and attain the electric power reduction technique for energy saving of the advancement of not only environmental protection but removal of the idea of a water cycle when securing precious water resources, nitrogen, Lynn, etc. Moreover, although the general method in sewage disposal is an activated sludge method which consists of microbial ecosystems based on the food chain of, such as a protozoan Vorticella, and Stentor, and micro metazoa Philodina and an aquatic life earthworm, such as biological bacteria. The problem by the ability of nitrogen and phosphorus elimination ability as nutrition salt that there is much power consumption and to have not attained at low cost which should be solved is left behind. Low cost needs to attain the increase in efficiency of the biological phosphorus elimination reaction by a phosphorus accumulation microbe, etc. by the increase in efficiency of the biological nitrification reaction which uses ammonia as nitric acid, and the biological denitrification reaction which uses nitric acid as nitrogen gas on aversion conditions, and repetition of aversion good mind conditions. In order to solve these, the conventional continuation aeration method or aeration, and non-aeration of an activated sludge method from the technique operated based on an experiential technique, Research technique development for establishment of the co-benefit technique which makes compatible the advancement of the electric power reduction by introduction of the aversion good mind operation technique which supplies only the amount of oxygen which a

2 microbe needs, and water quality was carried out. If aeration and non-aeration can be efficiently performed in a single biological treatment reaction vessel, it is possible to attain energy saving. Since it is the electric energy for the aeration supplied to a biological treatment reaction vessel about 50% of the amount of used electricity of the present sewage disposal plant, it is very important to hold advanced water quality and to attain the electric energy. It is necessary to carry out optimal management of the aeration control system for a plant design when rationalizing aeration efficiency. For that purpose, in order to optimize the ON-and-OFF time of the fan for supplying aeration air, the control sensor system is used, and the computer program automatic ventilation control which has functionality from simple timer ventilation control becomes important. Almost all the existing ventilation control system has been making the fan operate it based on the threshold value of the combination of physicochemical Parameter like dissolved oxygen (DO), an oxidation-reduction potential (ORP), ph, ammoniac nitrogen (NH4N), and nitrate nitrogen (NO3N). However, such a controlling method is difficult to maintain and it is regarded as questionable that suitable control cannot be performed from depending also for reliance owner control on the experience value. An AOSD (AUTOMATIC OXYGEN SUPPLY DEVICE) system as a system which calculates automatically the amount of oxygen which the microbe which is the innovative technique introduced by this doctoral dissertation research needs, and supplies it, In order to calculate the optimal time of aeration - non-aeration by making 1 cycle into 120 minutes, it is the technique which mathematizes the nitrification reaction velocity / denitrification reaction velocity of the microbe used as the core which inhabits DO change, water temperature change, and a biological treatment reaction vessel, follows based on this formula, and has the novelty and the originality which carries out programmed control. In order to verify the performance reservation which introduces this technique and can actually set a mathematical study computing equation, evaluation of processing performance and energy reduction capability was performed. That is, in this research, analysis and evaluation were performed for the validity of the AOSD control system in constant temperature and fixed influent quantity load conditions from water characteristics, the sludge characteristic, the living thing characteristic, the energy-saving characteristic, etc. The drainage from the household for an examination is BOD200 mg-l -1 of the national standard of the quality assessment of a septic tank; TN 45 mg-l -1 ; TP5 mg-l -1 ; The everyday life drainage by which standardization adjustment was carried out was used for SS 150 mg-l -1. Controlled study in an AOSD system control system (1 cycle of 120min), and

3 fixed aeration / non-aeration time (conditions, such as minutes, minutes, and minutes) was done using this everyday life drainage. In addition, effluent quality, sludge, the living thing characteristic, etc. were estimated by the standard sewer test method. As a result, in the AOSD control system, aeration time was an average of 32 minutes (width 27 to 35 minutes). In this AOSD system aeration autotuning control time, effluent quality became it is good and clear [biota being also very qualitatively and quantitatively abundant being good and various, and stabilizing it] as compared with 30, 40, and the fixed aeration time for 60 minutes. The T-N extraction ratio is 95% or more at 85% or more, the BOD extraction ratio of an AOSD system control system has a T-P extraction ratio at about 60%, and it turned out [ very excellent ] that it may be [ a thing ] highly efficient. In addition, it can be called body resulting from the biological nitrification denitrification reaction having been promoted very efficiently under the supply condition of the amount of required oxygen that the T-N extraction ratio was reinforced. That is, since it functioned in order that the nitrification reaction in the process of good mind conditions and the denitrification reaction of aversion conditions might make oxygen utilization efficiency increase to the utmost and might carry out supply consumption only of the required oxygen can be said. Moreover, in the AOSD control system, when raising further the solid-liquid separation ability of the sludge in the precipitation tank which are the fundamental conditions should be satisfied with an activated sludge method of conditions and obtaining good treated water, it turned out that it has a big effect. The aeration restrictions in the optimal calculation time of the fan operation in an AOSD control system became clear [contributing greatly] to both reduction of the amount of discharge of carbon dioxide, and reduction of an energy amount of consumption. Moreover, in the AOSD control system, it turned out that greenhouse gas CO2 (carbon dioxide), CH4 (methane), and the amount of discharge of N2O (nitrous suboxide gas) are certainly reduced as compared with fixed aeration / non-aeration time (conditions, such as minutes, minutes, and minutes). Based on these results, the wonderful knowledge that an average of 46% of power consumption was reducible was able to be acquired with the AOSD control system as compared with the conditions for fixed aeration / non-aeration time minutes which is an operating method with most track records in our country. In addition, although it had become an important proposition in the sewage disposal system how maintenance management is easy-ized, when the automatic washing system fluorescence electrode LDO of DO primary detecting element is used for an AOSD control system showed becoming maintenance-free as a matter

4 of fact to management of a living thing reaction. When important energy and water quality problem in the 21st century will build continued type society, it is a very big subject. It has been a pressing subject to secure advanced water quality and to attain energy saving from the present condition of a lot of aeration energy consumption which occupies about 50% of power consumption energy also in a sewage disposal system. It has improved greatly by introducing the AOSD control system for optimization of control of the amount of aeration for attaining energy saving for this subject. the AOSD control system which can aeration control only the amount of required oxygen of the microbe of the above result to a sewage disposal plant is an environment-friendly system with large reliability -- it was judged. 2. Summary of AOSD Control System Examination When important energy and water quality problem in the 21st century will build continued type society, it is a very big subject. It has been a pressing subject to attain energy saving, after securing advanced water quality from the present condition of a lot of aeration energy consumption which occupies about 50% of power consumption energy also in a sewage disposal system. In order to solve this subject, optimization by introduction of the system control of the amount of aeration for attaining energy saving is required. In the perfect mixing type single tub type activated sludge method under the AOSD (Automatic Oxygen Supply Device) system introduction which carries out the automatic control of an aversion and the good mind time in this research according to the oxygen consumption rate of a microbe, While the removal performance of T-N and BOD improved under fixed water temperature and inflow load conditions compared with the conventional good mind aversion fixed operation by AOSD automatic control, it was able to be shown clearly that the power consumption of a blower is reducible. In addition, although it is becoming clear that it verifies now to the control system configuration which can follow water temperature change of the seasonal variation of the four seasons, and construction of the operation conditions of the high-class treatment of removal of nitrogen and phosphorus nutrition salts to automatic control operation to water temperature and an inflow load change, and is satisfactory, Validity of the AOSD control system was able to be clarified certainly. Thus, using life real drainage, comparison analysis of the performance gain effect by the existence of AOSD system introduction is conducted qualitatively quantitatively biochemically, and it can be said that it is a very important result

5 that the optimal system of AOSD system control which can be used widely has been built in general internationally. From the above-mentioned research, it can say that the result in which there are novelty, originality, and usefulness is obtained, and it is wonderful as contents and is judged as success by excellent performance. 3. International Excellency of Ceramic Inorganic Matter Film of MEIDENSHA About the excellency of the ceramic inorganic matter film (MBR) of MEIDENSHA, it is verified from the base and application test and research more than for the past five years. As for the organic membrane developed in present China, it is indispensable that opposite abrasiveness exchanges films periodically weakly. However, the ceramic inorganic matter film (MBR) of MEIDENSHA has very large tolerance, and will be able to be operated by no exchanging in about 30 years. Although expense of initial investment is high compared with organic membrane, if it will see in a plan for 30 years, it can be said that it is remarkable and cost is cheap. It is the characteristic in which this is very important to the forward planning of 嘉浄環保 Corp. What excels the ceramic inorganic matter film (MBR) of MEIDENSHA in the measure against reuse of water does not exist. 3.1 Hydrogen Sulfide Generated in Application and Efficient-ized Anaerobic Treatment of Micro Air Ration Aiming at Desulfurization to Anaerobic Ceramic Inorganic Matter Film (MBR), In a very high-concentration case, it decreases the conversion ratio to methane of an organic matter, or it not only becomes an obstacle in the case of exploitation of energy of gas, but produces prevention. A little air introduction (micro air ration) to a reactor under suitable control of the amount of supply, it contributes effectively to reduction of hydrogen sulfide concentration, without producing prevention by oxygen to a methane producer etc. As a result, while the quality of gas improves, it may lead also to increase of a methane recovery rate. This technique has the main application to the research and the real institution of anaerobic treatment which used the perfect mixing tank. The application to the reactor used for anaerobic effluent treatment, such as UASB and MBR, has not been reported yet. Moreover, it is applied to the low-concentration case whose occurring hydrogen sulfide concentration is thousands of ppm in many cases, and there is almost no example of application over a tens of thousands of ppm high-

6 concentration case like a certain kind of industrial waste water. In the manufactory-waste-water processing etc. which microbe prevention, high desulfurization cost, etc. generate [ in / sulphate concentration is high and / anaerobic treatment ] in this research, Application of micro air ration was tried under high hydrogen sulfide concentration to anaerobic MBR for the purpose of forming the energy recovery type processing using anaerobic MBR, and the improvement in processing speed by reduction-izing of hydrogen sulfide concentration and prevention mitigation in gas and liquid has been checked. It was efficient with it, and the technical improvement of the air ration system was completed so that it could process. In such anaerobic treatment, the excellency of the ceramic inorganic matter film of MEIDENSHA is proved. Although the advancement of energy recovery, such as methane from the biomass waste which poses the present problem, is developed with a new membrane separation aversion processing system in this research, Resource circulation of high-speed efficient recovery, the electric energy conversion, and the biomass of clean energy is attained by establishment of this system, the great result which contributes to construction of low carbon type society is expected, and it can be said that a ripple effect is serious. 3.2 The fowling control technique in the good mind membrane separation activated sludge method which usedceramic flat membrane Development and efficient-izing as the effluent treatment technique of drainage from the household, the membrane separation activated sludge method (MBR) corresponding to miniaturization or sludge streamlining is developed in recent years. Moreover, MBR does not have the spill of suspended matter (SS) and is suitable also for reservation of transparent water, or reuse as reuse of waste water from the ability of the filtration capture of the bacteria, such as an E. coli bacillus, to be carried out. However, since the power consumption of the aeration operation which prevents a membranous blockade (fowling) increases, let it be a subject for maintenance management cost to become higher than the conventional method. The characteristic of ceramic flat membrane was analyzed in the result of research in the 2013 fiscal year, and it checked that film fowling could be controlled by changing process conditions. However, rather than an air content required for biological treatment, the air content required for scrabing air was large, and it was not able to attain less than T-N concentration 10 mg-l -1 of the target in effluent treatment performance. Moreover, correlation was not looked at by the amount of film surface adhesion of an organic matter, and the difference pressure between films before

7 immersion cleaning, but still more detailed analysis of a film fowling substance is needed for them. So, it aims at control of the electric power reduction in the membrane separation activated sludge method by combined use of an AOSD (Automatic Oxygen Supply Device) system and ceramic flat membrane, and film fowling in the research in the 2014 fiscal year. Moreover, specification of the fowling causative agent by the effluent treatment experiment using ceramic flat membrane and the fowling characteristic grasp, and it builds the fundamental indicator of the fowling control technique. The following results are expected by introducing an AOSD system into MBR. 1 Drastic reduction of the maintenance cost by formation of scrab ing air intermittence. 2 High-class-treatment-izing of drainage by an AOSD system 3 The film fowling inhibiting effect accompanying high-class-treatmentizing of drainage. MBR which is the high-class treatment technique is the technology of contributing to water environmental preservation. Therefore, establishing the operation indicator which controls development and fowling of the technique of reducing the aeration power which is the bottlenecks of MBR spread can expect the ripple effect to the effluent treatment field.