detention time optimization

  • Wastewater Technology Fact Sheet: Chlorine Disinfection

    Title: Wastewater Technology Fact Sheet: Chlorine Disinfection Author: US EPA, OW, OWM, Water Permits Division Subject: Fact sheet on disinfection, one of the primary mechanisms for the inactivation or destruction of pathogenic organisms.

  • Distribution System Guideline for Obtaining a ...

    For Optimization Objective It is important for water systems pursuing optimization to have a good understanding and ... (i.e., theoretical detention time) was determined at each individual site by estimating the pipe length and diameter from the sample tap to the main coupled with a …

  • Problem Solved: Detention Time

     · American Water College presents - Problem Solved!This is a solution to a typical detention time problem, found on state certification exams. It is also an im...

  • Calculate the Hydraulic Detention Time in a treatment tank ...

    1. Hydraulic Detention Time A. Calculate the Hydraulic Detention Time in a treatment tank given the following: Flow to a rectangular aeration basin is 3.0 million gallons per day. The clarifier is 100 ft in length, 50 ft wide, and 15 ft deep. Calculate the aeration basin''s hydraulic detention time. B. Is this an adequate amount of treatment time?

  • ENHANCING THE PERFORMANCE OF OXIDATION DITCHES

    Detention time = 0.97 day Sludge age = 27 days MLVSS = 1800 mg/l MLSS = 2700 mg/l F/M ratio = 0.11 lb BOD5 per lb MLVSS Waste sludge = 2820 lb/day (TSS) TSS in waste sludge = 10,000 mg/l Waste sludge flow = 0.034 mgd Return sludge flow = 50% to 150% of raw waste flow Aeration horsepower= 300 hp

  • Title: Centrifuge Optimization

    maintain the solids capture rate. This reduction in sludge retention time causes the cake dryness to decrease as seen in the graph. This graph is also helpful in illustrating that the sludge flow can be operated between 50 an 80 GPM without a significant decrease in performance.

  • How to Reduce Detention & Make the ELD Rule Easier

     · Hours in Detention x 3 Times a Week x $19.38 per Hour. With a trucker experiencing a 6 hour wait 3 times a week, that''s $348.84 of drive time wages lost in just one week. Bump that up to an 8-hour detention and the driver loses $465.12 in week. Some reports even indicate that truck drivers can spend upwards of 40 hours per week in detention ...

  • Criminal Pretrial Detention Hearings | James Education Center

    The government''s failure to move for detention in compliance with the prompt hearing requirement does not preclude the prosecutor from asking for a hearing at a later time. United States v. Montalvo-Murillo, 495 U.S.711, 717 (1990).

  • Wastewater Nutrient Optimization & Nitrogen Removal 2018

    –More Bugs, longer solids detention time in the aerator, more Air- oxidation rate highest at 3.0 mg/L D.O. • Longer Hydraulic Detention in Aerator • Alkalinity additions if needed • Absence of Toxic impacts • Temperature . TN Plant Optimization Program (TNPOP) Wastewater Nutrient Optimization & N Removal Brett Ward-MTAS 31 of 50

  • Chapter 13 Quality Control Optimization of Extended ...

    detention time. The usual assumption implicit in specified detention times is that the longer detention time provides a higher level of water quality control. Furthermore, there is usually little quantitative justification for the specified detention times. This chapter analyzes the implications of required detention times of

  • An integrated optimization and rule-based approach for ...

     · In this approach, the optimization part provides the optimized outflow set-points for the basin to minimize peak flows during the wet periods, while the rule-based part controls the quality of the discharged water, through sedimentation, by increasing the detention time.

  • Effects of Residence Time and Depth on Wet Detention ...

    residence time. However, the significance of residence time on wet detention pond performance has been clearly reported by several researchers. Rushton, et al. (1997) documented a substantial improvement in wet detention pond performance by increasing the mean pond retention time from 2 days to 14 days. Significant increases in removal

  • Stormwater Best Management Practices (BMP) Performance ...

    independent of the drawdown time and the infiltration rate. This revision (March 2010) results in updated infiltration basin performance curves, which are included in Appendix B.

  • OPTIMIZATION OF ACTIVATED SLUDGE PROCESS SYSTEM …

    Optimization of detention time: - Day 90 & 97 (after 5 days from optimum biomass development) Optimization of detention time was carried for time range of 4-36 hrs. Looking to the table 04 and Fig. 03, it is observed that for 20, 24 and 30 hrs of detention time dye removal rate was observed to be nearly same hence 20

  • Cut Down Detention Time for Truck Drivers with Technology

    Detention time trucking makes it harder for drivers to make up for the lost time with their 14-hour on-duty cap. Similarly, another survey of 257 owners and operators conducted by DAT revealed that 63 percent of survey participants experience more than three hours of wait time …

  • 12 Detention Time Prevention Strategies for Inbound ...

     · Detention time has always been a big problem for shippers and truckers alike. Shippers see an added expense on freight costs, and truckers are forced to replan their entire day.Unfortunately, the rise of hours of service (HOS) regulations and electronic logging devices have forced the issue on truckers. Now, unnecessary delays will have an even more significant impact on trucks or ability to ...

  • Full Spectrum Detention Study

     · the minimum recommended drain time in the updated draft USDCM. Speeding up the drain time to 52 hours actually increases the outflow to 2706 cfs. Figure 4. shows these results in comparison to the no-detention scenario and the results for a model with 10% FSD at the downstream end and the upstream 90% with no detention.

  • Methodology for Analysis of Detention Basins for Control ...

    The analysis has a planning orientation rather than a research one, consistent with the principal focus of the NURP Pfogram- The basic objective of the analysis that has been structured is to provide a basis for establishing "first order" design specifications (size, detention time), in terms of a long-term average removal ot urban runoff ...

  • Troubleshooting Activated Sludge Processes Introduction

    stabilized in a short detention-time activated sludge system. The fourth general problem relates to low effluent pH. It is found most often in geographical areas . with naturally low-alkalinity water supplies where extended aeration and/or nitrification processes are used. It is usually fairly easy to control.

  • Detention time selection for stormwater quality control ponds

    detention time for extended detention ponds to ensure water quality control. In reality, the pollution-control performance of such facilities is governed by two opposing forces: improved pollutant removal efficiency over longer detention times and the decreased volume of runoff captured and treated by the facility for longer detention times. The

  • Continuous Simulation Modeling

    Two levels of optimization are available for detention pond sizing: Quick Optimization and Full Optimization. Quick Optimization determines a "ballpark" solution in a relatively short time (usually less than one minute). Full Optimization does an exhaustive search of potential

  • (PDF) Linear System Theory-Based Optimization of Detention ...

    In the context of urbanization and waterworks construction, detention basins located in upstream tributaries have become one of the most-effective technical solutions for downstream flood reduction. This technical note proposes a new optimal approach

  • detention ponds 1.ppt

    A detention basin is an artificial flow control structure that is used to contain flood water for a limited period of a time. Detention Ponds Detention basins are used to mitigate the effects of storm water runoff by providing temporary storage and control release to downstream areas. Detention Ponds Detention basinsare for short-term storage of

  • Design Optimization Of The Chlorination Process, Volume 1 ...

    The total detention time in piping to this sampling tap was approx- imately 20 seconds. The studies at San Leandro, San Pablo and Pinole were done with the 76 mm (3-inch) tee; the studies at Sacramento and Dublin-San Ramon were done with the 38 mm (1.5 inch) tee.

  • Use Send Time Optimization

    Send Time Optimization can be used on Mailchimp''s regular, plain-text, A/B testing, and multivariate email types. This feature is not available in automated emails. We don''t recommend this feature for same-day sending. This feature can only be used if there are more than five hours left in the day in the time zone set for the account.

  • Drivers speak up: Dwell times are costing us | Transport Dive

     · Drivers speak up: Dwell times are costing us. Many told WorkHound they are often stuck waiting for freight to be loaded. Wait times in the form of dwell and detention are coming down at facilities across the United States, according to a FourKites executive, but the issue was one of the top concerns of truck drivers for the first half of 2020.

  • Determination of the Optimal Location for Developments to ...

     · Previously several optimization models have been developed for the optimal design and location of detention basins in watersheds. These include the models by Mays and Bedient ( 1982 ), Bennett and Mays ( 1985 ), Taur, et al. ( 1987 ), Ormsbee et al. ( 1987 ), Tung ( 1988 ), Travis and Mays ( 2008 ), and Park, et al. ( 2012 ).

  • Detention Basin Retrofit: Optimization of Water Quality ...

     · Detention Basin Retrofit: Optimization of Water Quality Improvement and Flood Control ... Quantitative relationships were obtained between the increase in stormwater detention time (pollutant removal efficiency) for a defined, small, infrequent water quality storm and the maximum increase in peak outflow rate (flooding impact) for a full range ...

  • Detention in Trucking Why Carriers Care (And Shippers Aren ...

     · Essentially, lowering detention time is a win-win opportunity. It offers the ability for carriers to increase the productivity of their assets, improve safety and heighten morale of their drivers.

  • Sedimentation Tanks: Design and Working

     · It is that time which would be required by the flow of water to fill the tank if there were no outflows . Detention time (t) for rectangulat tank is VOLUME OF TANK RATE OF FLOW The retention time usually ranges between 4 to 8 hrs for plain sedimentation and 2 to 4 hrs when coagulants are used . The flowing though period is the actual average ...

  • A Surrogate-Based Optimization Design and Uncertainty ...

     · Yazdi J, Salehi Neyshabour SAA (2014) Adaptive surrogate modeling for optimization of flood control detention dams. Environ Model Softw 61:106–120. Article Google Scholar Yazdi J, Salehi Neyshabouri SAA (2015) An optimization model for floodplain systems considering inflow uncertainties. Water Resour Manag 29(4):1295–1313

  • Checklist for Review and Optimization of Treatment for ...

    Assess basin detention time for adequate reaction time (20 to 40 minutes at maximum flow rate is typically desirable), consider use of tracer study to evaluate. Evaluate flocculation equipment, consider the …

  • The Secret to Combatting the Hidden Costs of Detention Time

     · Shippers incur detention charges intended to compensate drivers for undue time spent waiting to unload or load. Fees typically range from $50 to $100 per hour for any delay longer than two hours. In addition, shippers can face chargebacks from customers who are unhappy about not receiving merchandise by the agreed-upon delivery date.

  • Demurrage and detention charges in container shipping | UNCTAD

     · Increase of detention and demurrage charges in recent years. During the last few years, free time periods have been reduced and tariffs for demurrage and detention charges have been increased considerably on a global level. There are indications that shipping lines abuse the charging of demurrage and detention to maximise profits.

  • Iron and Manganese Removal

    Detention time can also be provided with head on the filters rather than requiring a separate tank. Detention time before filtration should be at least 20 minutes, more if possible. The pH of the water influences how much time is needed for the reaction to be completed. After oxidation of the iron and manganese, the water

  • Cut Detention Time Now

     · Learn how to cut the amount of time your fleet spends waiting by loading docks. Detention time costs add up - cut them now!

  • Sedimentation and Clarification Sedimentation is the next ...

    Optimization of the Sedimentation and Clarification Process ... normal detention time. Causes of shortcircuiting may include poor influent baffling or improperly placed collection troughs. If the influent enters the basin and hits a solid baffle, strong currents may …

  • Detention Time: What It Is and How to Calculate It

     · Detention time is the length of time that water or suspended material is retained in a tank or channel, or, the length of time from when water enters a settling basin until it flows out the other end. It can also be thought of as the amount of time it takes to fill an empty tank or vessel.

  • CMA CGM | Demurrage and Detention Tariffs

    Detention & Demurrage charges will be applicable for shipments wherein customers have exceeded the standard free time applicable both in the import & export cycles.. Demurrage: This charge will be levied when the Customer holds CMA CGM equipment inside the terminal for longer than the agreed free days and is applicable to all containers that remain at the terminal longer than the agreed free time.

  • Multiobjective Optimization of Low Impact Development ...

    Optimization of detention pond and land use planning was carried out by Harrell and Ranjithan (2003), who used a simple genetic algorithm (GA) to generate a cost-effective detention pond configuration within sub-catchments of a watershed in order to reach target water quality control. Zhen et …

  • Optimizing Denitrification in Anoxic Zones

     · Diurnal peak flows may require a larger anoxic zone to account for reduced detention time, but this need might be offset by higher concentrations of organic material.

  • Retrofitting an Aeration Basin with Anoxic Zone to Reduce ...

    • Increase RAS to the maximum to minimize clari!er sludge detention time was not effective . Why Did Sludge Float • Nitri!cation converts ammonia to nitrate • Without oxygen in the secondary clari!ers, nitrates will denitrify producing nitrogen gas ...

  • Simulation and Assessment of Long-Term Stormwater Basin ...

    multiple existing stormwater detention basins may impact hydraulic conditions in a watershed. A calibrated hydrologic model of the Central Stroubles watershed in Blacksburg, VA was subjected to a simulation of real-time control on the outlets of seven existing detention basins.

  • Bitsum. Real-time CPU Optimization and Automation

     · Process Lasso is Windows process automation and optimization software. From tuning algorithms like ProBalance to user-created rules and persistent settings such as CPU affinities and priority classes, Process Lasso enables full control over running applications! Our famous ProBalance algorithm maintains system responsiveness during high CPU loads.