Q = sludge flow sent to the thickening unit (m3/h) A = horizontal thickener surface (m2) Solids load: it defines the required surface for an appropriate sludge thickening in the unit bottom part (compression area). On the surface of the unit, a sludge float blanket will be maintained anywhere from 8 to 24 inches in thickness. 2.4.

7.46.2 Gravity thickener design data plots. 17.3.1 Design Considerations. A 70-foot-diameter gravity thickener receives 32,000 gallons per day of biosolids.

The Conventional Thickener. 2.

Thickening is accomplished by either gravity or dissolved-air flotation. Several simple recommendations are important: Operating point (white circle at crossing of the red and the blue line) must be below the safe flux curve.

In particular, the sizing of the biological reactor for the activated sludge process is critical to good process design because the downstream process units depend on its output.

The next step is to apply a factor of safety and Tank size constraints to this value. Where the sludge is to be removed by gravity alone, 1:4 slope is recommended. This design is most commonly used for primary treatment, thickening, and general use industrial clarifiers, however, they can be used for secondary (biological) treatment and/or flocculated solids collection.

Note 2: The waste emulsion/spent emulsion (line WC 1.1.3) will be coming from the draining and empty of the emulsion tanks. In case of drain of emulsion tanks.

Note that the influent mass always equals the effluent mass + the mass i n the thickened sludge . The inclined plate clarifier shall have an integral sludge hopper located below the plate zone. To calculate the minimum diameter: (118.75 kg/hour) / (4 kg/m 2 .hour), which results in a 6.14m Diameter. Figure 10-7. Thickening is the first, and frequently inevitable, step in reducing the volume of sludge extracted from the water line. 73.1.3.2 Access Manholes At least two 36 inch (91 cm) diameter access manholes should be provided in the top of the tank in addition to the gas dome.

Because of solids loss, which differs depending on design of the thickener utilized (less than 1% to 10% loss), the amount of sludge going in isnt the same as the amount coming out. The peripheral velocity of a scraper must be at least 15 feet per minute but no more than 20 feet per minute.

Calculations showing the related stresses developed in the drive cage and sludge collection arms at 200 percent of the continuous operating torque per paragraph [2.4C].

The hydraulic from where it is pumped through the sludge pumping station to the mechanical sludge thickening station, and then to the mixed thickened sludge tank, where it is mixed with the thickened preliminary sludge. This technology is fitted with a stirrer comprising a series of relatively closely-spaced vertical arms, and is therefore similar in appearance to a picket fence. 8a and 8b.

The main design variables to be considered in selecting a thickening process are Solids concentration and volumetric flow rate of the feed system Chemical demand and cost if chemicals are employed Suspended and dissolved solids concentration and volumetric flow rate of the clarified stream

units.

Sludge waste flow rate in the primary settling unit= 140 m/d; and concentration = 2.5% Sludge waste flow rate in the For both designs, the sludge enters the centre of a cylindrical tank and flows out to the periphery.

Note 1: The estimated concentration of oil in rolling emulsion WW 1 is 5 7 g/L (line WC 1.1.2).

It is also very easy to concentrate this type of sludge with a static thickening step just befo-re dewatering. Thus, the calcula-tions of area requirements should not be based solely on clarification data. Activated sludge SRT = 10 days Desired VSS destruction in digester = 45% Design temperature = 20C From previous figure, C x days = 1100 Required digester detention time = 55 days Oxygen requirements = 2.3 lb O 2 /lb VSS destroyed Aerobic Sludge Digestion: Scenario #1 Activated sludge SRT = 40 days

2. It is made of a mixture of microorganisms. sludge toward the center of the unit and into the sludge collection pit. A circular mechanical gravity thickener must have a minimum bottom slope of 1.5 inches per foot. 2 - Influent suspended solids = 200 mg/L. r = settling rate in feet per hour in the layer. Presently accepted thickener design procedures, based on laboratory batch settling test and theoretically derived analytical procedures for "ideal" Biosolids thickening calculations are based on the concept that the solids in the primary or secondary biosolids are equal to the solids in the thickened biosolids. Today, activated sludge processes can be modeled using commercially available software.

Solids concentration, mg/L. Make appropriate assumptions in your calculations. distribution in the feed, Q is the volume flowrate of. Calculating Thickener Area: Thickener area required is then calculated by applying above determined data in the following formula: A = 1.333 (F D)/R.

If it is determined that sludge thickening is needed, the design of thickeners (gravity, dissolved-air flotation,

Because of solids loss, which differs depending on design of the thickener utilized (less than 1% to 10% loss), the amount of sludge going in isnt the same as the amount coming out. The inclined plate clarifier shall have an integral sludge hopper located below the plate zone. A = Thickener area in square feet per ton of dry solids thickened in 24 hours.

11 - Settled sludge specific gravity = 1.02.

Solids concentration, mg/L. Activated Sludge Design Calculations The table below shows typical values for three design parameters sometimes used for sizing activated sludge aeration basins: volumetric loading, food to microorganism ratio (F:M), and hydraulic residence time (HRT).

With reference to Figure 9-3, a sludge with 1% solids thickened to 5% results in an 80% volume reduction (since 5% = 1/20).

Design based on Iaboratory data First Approach: It is the best technique if the Iaboratory data is available. WHICH THICKENING TEST METHOD TO USE CYLINDER SETTLING: Good for the Accurate Measurement of the Initial Settling Rate of Slurries with a High Enough Concentration to Observe an Interface SETTLEOMETER: Good for the Determination of Sludge Volume Index (SVI) in Activated Sludge Plants (aka Biological Oxidation Systems) This innovative scroll design prolongs the life of the discharge nozzles on both the bowl and the scroll.

3. Understanding your facilities treatment process and implementing a solids management plan will help to simplify the answer.

3 - Influent VSS = 150 mg/L.

This course is designed to provide basic understanding on sludge thickening and stabilization concepts and design criteria. Applied flux = G f = (x f Q f) / A (8a) (8b) Applications to thickener design

qfl is the flocculant flowrate, D is the solid mass. A common variant on the gravity thickener design is the picket fence thickener. 2.4.2.

Dick and Ewing [3], Dick[4,5] and Mancini [6] have graphically discussed the prevalent failure to consider both the clarification and thickening aspects in design of sedimentation units. in waste stabilisation ponds, planted or unplanted drying beds, short rotation plantations or by composting) .The ponds are designed as simple ponds in which faecal Design sizing should be based on rational calculations, including: total pounds of waste sludge anticipated, design solids and hydraulic loading of the unit, operating cycle in hours per day per week, removal efficiency, and quantity and type of chemical aids required. f = ratio of fluid to flocculated solids in the layer. : # Where: CS = solids load (kg SS/m2/h) Q = sludge flow to the thickening unit (m3/h) X = solids concentration (mg/L) Main Office: (518) 695-6851 PO Box 118, Greenwich, NY 12834 . pounds per foot) applied to the rotating sludge removal arm.

Gravity thickening supernatant; Primary sludge. Sludge thickeners are generally suitable for concentrate concentration or tailings dewatering in wet beneficiation operations. Thickening is defined as removal of water from sludge to achieve a reduction in moisture content of slurries. Effluent TSS Concentration 8.

Gravity Belt Thickening to Increase Efficiency City of Elyria Wastewater Pollution Control Plant.

support calculation. Centrifugal thickening and dewatering of sewage sludge is a high speed process that uses the force from rapid rotation of a cylindrical bowl to separate wastewater solids from liquid to produce a non-liquid material referred to as cake..

New Plow Design The Gravity Belt Thickener is used to thicken sludge prior to centrifuge or digestion processes. This sludge continuously enters the thickener, and the thickened sludge is continuously withdrawn at a concentration of 21 gm/l (1.302 lb/ft3). The results of the design and calculation of the thickener sludge unit found that the total sludge entering the thickener zone was 16,942.10 kg / day, the thickening depth used was 1.4 m, and the total thickener depth was 4.5 m. The production of sludge in the digester zone is 14,400.79 kg / day and specific gravity is 1.02.

(1) Design Conditions Calculate the Daily Sludge Production; To use this calculator please fill in the input value data of your sewer wastewater and as a result some basic plant design and effluent BOD data will follow out of the calculations. 400. Application of flux curve to real clarifiers can be quite complex.

Pre-thickening sludge to greater than 4 percent TS prior to aerobic digestion can lead to autothermal digestion and issues associated with this process such as odours and foaming problems. The liquid flow, BOD load, and TSS load in these recycled streams contribute to the wastewater flow to be handled by the mainstream wastewater treatment processes.

Presently accepted thickener design procedures, based on laboratory batch settling test and theoretically derived analytical procedures for "ideal"

Design computations for the cover in accordance with paragraph [2.4L]. 1.6 Material Balance Calculation 1.6.1 Design Condition Incoming Sewage Flow m3/d 136,000 Inlet SS mg/l 210 Outlet SS mg/l 20 The resulting material is still fluid.

provided for a given sludge are based on laboratory settling test of the sludge, and the rotating sludge rake usually is designed so its peripheral velocity is about 5 fps (1.5 m/sec). Sludge Thickening Project Background. Engineering Civil Engineering Q&A Library Design a gravity thickener to concentrate the mixture of sludge obtained from primary and secondary settling units in an activated sludge wastewater treatment plant. The operation of a dissolved-air flotation unit is similar to flowrate in the underflow discharge, F is the solid. The problem begins with calculations that are based on what goes in the thickener instead of what comes out.

The primary objective of sludge thickening is to concentrate the solids, thus reducing the volume of sludge.

5- Maximum head loss, clogged screen (mm) = 800.

Integral Mechanical Thickener Sludge Hopper Design Criteria 2.4.1. The SSTs robust design allows for long operation times, minimal maintenance, and extremely low power consumption.

Missing design values can then be obtained by making a volume balance and a mass balance over the thickener .

1. 3- Velocity through rack (m/s) = (0.3-1).

The drawback is that this sludge ferments very easily.

Calculation of limiting solids flux in gravitational thickening. The problem begins with calculations that are based on what goes in the thickener instead of what comes out.

However, determining if sludge thickening is worth the time and effort isnt quite as simple.

2012322CHAPTER 3 SLUDGE THICKENING Thickening is a procedure used to increase the solids content of sludge by removing a portion of the liquid fraction. mass flowrate in the feed, F3 (x) is the particle size.

Most wastewater treatment facilities benefit from sludge thickening operations. The required. To illustrate if waste activated sludge which is typically pumped from secondary tanks with a content of 0.8 solids can be thickened to a content There should be stairways to the access manholes. Waste activated sludge (WAS) and similar equipment and processes may be substituted depending on the selection and design of the sludge handling system.

Sludge flow, MGD = (Thickener loading, lbs/day/sf) x (Surface area, sf) F092 Desired lbs of solids in aeration tank = (Daily solids addition, lbs/day) x (Sludge age, days) 6 F094 New digestion time, days = (Digester volume, gal)x(Increase in sludge conc,%-Initial sludge conc,%) Learn more about BDP Industries' Gravity Belt Thickener, a sludge thickening product designed to thicken primary or secondary sludge prior to centrifuge or the digestion process. Sludge thickeners to reduce the volume of sludge should be considered to reduce the required digester capacity. (1) Design Conditions Design Maximum Hourly Flow: 200,000 m3/day Motor Driven Quantity: 3 (2) Specifications Type: Motor Driven Diameter: W1.68mH2.0m Power Requirement: 0.4 kW Quantity: 3 3.2 Fine Screen The principal role of screening is to remove fine materials from influent sewage.

FIG.

Data 1 - Influent flow-rate = 3,800 m3/day. The volume of sludge to be concentrated is 5200 gph (693.3 ft3/hr).

Rotary Dryer Design Calculations Procedure. Secondary Sedimentation Tank Mechanical Thickener (Waste Sludge) Discharge Pump Station Digester Sludge Dewatering Unit EFFLUENT OUTLET SLUDGE DISPOSAL B.1 -3.

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