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。
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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3楼
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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4楼
再帮着翻译一下下面这段话了。
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。
有兴趣的是所有的池子都由普通墙体材料所造。这得益于合理的提高其宽度并维持原有长度不变。
吹风机设备也对应的调整尺寸，以适应池子的容量。如此一来，在池子扩展前后都可以使用同一个吹风机。
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5楼
就是比我翻译的好啊!~佩服~~~~
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6楼
ICEAS池设计
池体——
用的最多的是混凝土池体
然而，一些情况下，钢池体也用，主要取决于建设投资估算
池体的数目由流量与建设方的要求来决定
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7楼
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。Sanitaire根据经验仅设计一个池体，别的池体都是一样的
ICEAS工艺系统的连续流特性使得建设一个单独的池没有交替使用的备用池
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8楼
我的信箱是ny1980@sohu.com有翻译的东西就发给我，可以互动进步
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9楼
上面的翻译是通过翻译软件做的吧？实在是需要改进啊。我的翻译如下请参考：
Sanitaire有设计单个水池或多个平行的水池的经验。此ICEAS工艺系统的连续流特性促进了单水池的设计和操作，而不需要对进水样平衡或建造第二个池体。
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10楼
谢谢你们啊!我的已经翻译完了,不过跟你们比就不好意思拿出来了~
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11楼
恭喜恭喜！
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