ICEAS BASIN SIZINGBASINSTypically, concrete basins are used。However, in some cases, steel is used depending on the cost evaluation of the plant construction。The number of basins used in the ICEAS process is a function of flow and loading to the plant and the guidelines established by individual Government Agencies。
ICEAS BASIN SIZING
BASINS
Typically, concrete basins are used。
However, in some cases, steel is used depending on the cost evaluation of the plant construction。
The number of basins used in the ICEAS process is a function of flow and loading to the plant and the guidelines established by individual Government Agencies。
Sanitaire has experience in designing systems built using a single basin to a multitude of parallel basins。
The continuous flow feature of the ICEAS process facilitates single basin system design and operation without the need for influent flow equalization or a second basin。
BASIN HYDRAULICS
Time based cycles are used in sizing the ICEAS process。
A normal cycle is designed to handle the Average Dry Weather Flow (ADWF) and Peak Dry Weather Flow (PDWF) to the plant。
A storm cycle is used to handle the storm flows。
The storm cycle operates with a shorter duration compared to the normal cycle so that higher flows can be processed by the system。
Typically, the ICEAS process can be designed to handle 3 to 6 times the average flow conditions。
The maximum volume required for the average, peak and storm flows are determined based on the cycle times。
This volume is the total flow received by the basin from the start of the cycle until the beginning of the decant phase and is defined as basin “Drawdown”。
The basin drawdown extends from the designated Top Water Level (TWL) to the Bottom Water Level (BWL)。
The ability to accommodate a Peak Wet Weather Flow (PWWF) of 6 times the ADWF is due to many ICEAS concepts。
The ability to have a special “storm” cycle with decanter speed control is very important。This cannot be achieved with conventional SBRs using fixed or floating decanters。SBR’s with floating decanters are usually limited to a PWWF of 3 times the ADWF。
PROCESS KINETICS
The influent BOD and ammonia loadings determine the mass of biomass required in the basin。
Typically, F:M ratios are used in determining the mass of the biomass for a given BOD loading in conjunction with minimum sludge age requirements for the nitrification process。
The typical Food:Microorganism (F:M) ratios used in design of the ICEAS process are in the range of 0。05 to 0。12 lb。BOD/lb。MLSS/day。
The Sludge Volume Index (SVI) is used to determine the volume occupied by the calculated mass of biomass in the basin。
The Typical SVI value used in the design of the ICEAS process is in the range of 150 to 200 ml/g。
In each cycle, a measured amount of sludge is wasted。
This allows the ICEAS process to operate in a steady state condition maintaining a desired Mixed Liquor Suspended Solids (MLSS) concentration and Mean Cell Residence Time (MCRT) or Sludge Age (SA)。
BUFFER ZONE
The design volume of the basin is based on a combination of the volume required for the hydraulics based on the peak wet weather flow conditions and the volume occupied by the sludge。
A “Buffer Zone” is included in the design as a safety factor to ensure the ICEAS process’s ability to withstand the unusual flows and loadings that are typical in wastewater treatment plants。
This zone is typically a minimum of three feet deep, extending from the top of sludge blanket to the BWL after decanting。
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BASIN DIMENSIONS
The basin depth is a combination of the sludge blanket, the buffer zone and the drawdown as shown in Figure 7。
The basin area is calculated using a designated TWL。
Typically, the length and width of the basin is calculated such that, a L:W ratio of 3:1 is maintained。
This ratio creates a plug flow pattern in the ICEAS basin。
Figure 7
ICEAS PROCESS DESIGN & OPERATION
The ICEAS process offers the following design options to maximize the flexibility of the plant operation and to meet its discharge permit requirements。
ICEAS-NIT Process
Designed for the Removal of:
BOD
TSS
Ammonia and Total Nitrogen (Partial Denitrification)
Typically Used for:
?Municipal Wastewater
?Industrial Wastewater
Nitrification and BOD removal is accomplished in the ICEAS process during the aeration phase of the cycle as shown in Figure 8。
The ICEAS basin is designed with F:M ratios and sludge ages suitable to maintain sufficient MLSS in the basin and to achieve the required degree of nitrification based on the temperature range and pH of the influent wastewater。
The blowers and aeration system are designed to ensure a sufficient supply of oxygen as required for the process。
A typical operating cycle for a two-(2) basin ICEAS-NIT process is shown in Figure 9。
The first half of the cycle is continuously aerated to achieve BOD removal and nitrification。
After the aeration phase, the system enters a settling phase where liquid/solids separation occurs。
The system then enters the decant phase, where treated effluent is decanted from the basin。
The duration of the aeration phase in the four-hour cycle allows one blower to provide air to two basins using motorized air control valves。
When Basin #1 is in the aeration phase, Basin #2 is in the settle or decant phase。
When Basin #2 is in the aeration phase, Basin #1 is in the settle or decant phase。
The 3-hour storm cycle for the same application is shown in Figure 10。
It is of interest to note that the overall aeration, settle and decant times per day remain the same as the normal cycle。It is only the duration per cycle that is changed to accommodate higher flows to the plant。
SBR systems using fixed or floating type decanters cannot offer this flexibility without affecting the overall duration of the aeration and settle phases on a daily basis。
Figure 8
Normal Cycle Operational Sequence of ICEAS-NIT Process
Figure 9
Storm Cycle Operational Sequence of the ICEAS-NIT Process
Figure 10
Cycle bar charts depicting the normal and storm cycles for the ICEAS-NIT process using four basins are shown in Figures 11 and 12。
The control system provides the flexibility of changing blower run time proportional to the influent flow and loading to the plant。
Additional controls such as dissolved oxygen probes in the ICEAS basin with blower output control can be provided。
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Normal Cycle Operational Sequence of ICEAS-NIT Process
Figure 11
Storm Cycle Operational Sequence of the ICEAS-NIT Process
Figure 12
ICEAS-NDN PROCESS: BIOLOGICAL NUTRIENT REMOVAL (BNR)
Designed for the Removal of:
BOD
TSS
Ammonia
Total Nitrogen
Total Phosphorous
Typically Used for:
Municipal Wastewater
Industrial Wastewater
Biological nutrient removal is accomplished in the ICEAS-NDN process by incorporating alternating phases of oxic-anoxic/anaerobic (air on-air off) conditions in the cycle as shown in Figure 13。
The ICEAS basin is sized to ensure complete nitrification, denitrification and to maximize the total biological phosphorus removal。
Typical normal and storm cycles using 2 basins for the ICEAS-NDN process are shown in Figure 14 and 15。
The aerobic phases promote BOD removal, nitrification and phosphorus uptake。
The anoxic/anaerobic (air off) phases promote denitrification and phosphorus release。Nitrification rates and sludge age requirements for the nitrification process are calculated based on the temperature range and pH of the influent wastewater。
The degree of denitrification and phosphorus removal achieved by the ICEAS-NDN process is dependant on the influent BOD/TN and BOD/TP ratios。
The typical blower control for the ICEAS-NDN process involves a D。O。control system with blower output control。
Figure 13
Normal Cycle Operational Sequence of ICEAS-NDN Process
Storm Cycle Operational Sequence of the ICEAS-NDN Process
The cycle charts for the ICEAS-NDN process operating in normal and storm cycles using four basins are shown in Figures 16 and 17。
Normal Cycle Operational Sequence for the ICEAS-NDN Process
Storm Cycle Operational Sequence of the ICEAS-NDN Process
EXPANSION POTENTIAL
The ICEAS process design allows simplified expansion because each basin forms a modular treatment unit。
The ICEAS process is ideal for a growing community requiring wastewater treatment。
The installation shown in Figure 18 is a facility designed for an ultimate flow of 2。0 MGD。During Phase-I, the plant was built with a design capacity of 0。25 MGD using two basins。It was expanded to 0。5 MGD in Phase-II by adding one additional basin with a capacity of 0。25 MGD。
In serving the growth of the community, the plant was expanded again in Phase-III through the addition of one basin with 0。5 MGD capacity bringing the overall capacity to 1。0 MGD。
This plant will continue to expand in the future。
It is of interest to note that all the basins have been built with common wall construction。This is achieved by maintaining the same length for all tanks and increasing the width appropriately。
The blower equipment is also sized proportionately to the capacity of each basin such that the same blowers are used before and after expansion。
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Phased Expansion of the ICEAS-NDN Process for a Growing Community
GENERAL ADVANTAGES OF THE ABJ ICEAS PROCESS COMPARED TO BATCH SYSTEMS
Proven process which enhances the standard SBR system through strategic cost, operating and biological advantages。
Continuous inflow provides equal loading and flow to all basins, simplifying operation and process control。
It enables single basin operation for maintenance and low flow conditions。
Incorporates a time, not flow-based control system that enables a constant relationship between aeration, settling and decanting。
Provides the same aeration time per day regardless of the cycle time。
BIOLOGICAL AND PROCESS ADVANTAGES
Biological Effluent Quality
Proven effluent quality below 10 mg/l BOD5 and TSS
Proven nutrient removal quality below 1 mg/l Ammonia-N, 1 mg/l total phosphorus and 5 mg/l total nitrogen
Low volume of highly stabilized sludge – dewaters easily
Pre-react Zone
Enhances bacterial growth with good settling characteristics while minimizing the formation of filamentous organisms
Allows continuous operation without short-circuiting
Enhances nutrient removal
Confines floating material for manual removal
No chemicals/filters required
Suitable for municipal/industrial wastewater treatment
Hydraulic and Organic Loading
??Can be designed to accommodate hydraulic peaks up to 6 times average design flow without sludge washout
No separate influent equalization basin needed, redundant tankage eliminated
Automatic activation of storm cycle during storm flows
Equal loading to all basins at all times
Easily expandable for future needs (modular system)
EQUIPMENT DESIGN ADVANTAGES
Decanter Design
Easy to install
Easy accessibility from basin walkway
In “Park Position,” acts as safety overflow weir
Stainless steel design – robust/corrosion resistant
Prolonged life
No flexible, costly, high maintenance knee joints, as needed for floating decanters
No submerged valves or orifices, which are prone to plugging
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Electrical Design
In-house electrical engineers to coordinate control requirements with biological functions to maximize flexibility with ease of maintenance
Control system designed to suit overall plant control needs
Modem to facilitate fault-finding
SCADA system for remote access
COST ADVANTAGES
Reduced capital cost when designed as an ICEAS continuous flow process
Up to 30% less basin volume to achieve same operating performance as an SBR Less Concrete
Less Excavation
Smaller Land Area
If others size basins as an SBR, then operating the process as an ICEAS will allow up to 30% greater flow
Reduced Operating Cost
No supplemental mixing required for aeration system
Proven D。O。control system for optimizing energy usage
Ultra high efficient SANITAIRE? Fine Bubble Aeration minimizes energy used for aeration
Reduced Installation Cost
No influent or effluent control valves
No retrievable equipment required
Decanter easy to install
Reduced Maintenance Cost
No influent or effluent control valves
Continuous flow enables shut down of one basin to facilitate maintenance of equipment when required
Retrievable aeration facilities not required
Decanter easy to service from walkway
INDUSTRIAL WASTEWATER TREATMENT
Inherent flexibility gained through automated control systems and adaptability to high flow and loading fluctuations make SBR systems well suited for the treatment of wastewater originating from industrial facilities。
ABJ SBR and the ICEAS process technology are applicable for both pre-treatment and complete secondary treatment。
ABJ SBR and ICEAS technology have been applied in the treatment of several types of industrial effluent including:
Pulp and Paper
Meat Packaging
Pharmaceutical
Food Processing
Dairy Industry
Textile
Bottling Plants
Chemical & Agricultural Products
FGD
SANITAIRE? Fine and Coarse Bubble Aeration systems are tailored specifically for each application to sustain the performance and longevity of the diffusers。
Special supports and piping fixtures are used to provide redundancy, thus eliminating the need to take tanks out of service for maintenance。
The decanter mechanisms are constructed completely of 304L or 316L stainless steel to provide maintenance free operation in corrosive environments。
The ergonomic and robust system design facilitates a simple process with minimal mechanical and electrical components。
In addition, the state of the art control system design with SCADA runs the process with minimal input from the plant operators。
Typical plant profiles are included for your review。
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6楼
朋友，你的东西很多啊！
如果你希望付费翻译的话，可以联系我。poplar_chen@hotmail.com 或发信给我。
本人给排水专业留美博士，可为您提供各种中英－英中翻译服务。每100字100元。
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7楼
先翻译下最后的一段话，看看你是否满意：
此系统设计功能强大，符合人体工程学设计，用最少的机械和电力配件组成了一个简易的设备。此外，当今最新的控制系统设计会采用数据采集与监视控制系统，而尽量减少操作人员的输入数据。在此随带着一些典型的厂区分布图，以备后用。
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8楼
内容不是太难。但是有很多词汇。如果是专业人士，应该能够看懂。如果不是专业人士，中文翻译准确，也是不理解。关键在专业背景，英语不是问题。
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9楼
是啊!你翻译的真好~我自己翻译的就菜多了,但是毕竟是免费的~谢谢你的支持~不过我可没那么多钱哦~再次感谢!!!!
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10楼
楼上的，谢谢你的称赞！我能理解你的处境的。以后有机会帮帮我就行了。。。
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