Draining tank after separation

On the other hand scrap-lead leaves the drum and reaches a rotating sieve for washing. After that it falls onto a conveyor belt and is stockpiled. Periodically and alternatively, the slurry carrying also the active matter is drawn from the tank and sent to a couple of draining tanks, of which one is contimrally being replenished and the other depleted. Here, water drains the material and is then eliminated into a sewer, while the active mass is from time to time collected, dried and added to the one already separated by the rotating sieve. 

After expanding through the high-pressure turbine, the exhaust steam is wet and at saturation temperature. It is routed through two external moisture separator-reheater vessels where it is dried and superheated.. The external moisture separators reduce the moisture content of the high-pressure exhaust steam from approximately lOto 13 percent at the rated load to 0.5 percent or less moisture. It uses multiple vane chevron banks for the moisture removal. The moisture removed drains to a moisture-separator drain tank, from where it is pumped to the deaerator, which is at similar pressure to the steam entering the low pressure turbine. 

At the Elsnig factory the crystallization of cyclonite is accomplished as follows. About 110 kg of cyclonite are introduced into a closed tank, with a capacity of 10001., equipped with stirrers and lined with a woollen filter cloth. Approximately 900 1. of acetone heated to 50°C are run into the tank to dissolve the cyclonite, after which the solution filtering through the filter cloth is drained down into a 30001. tank. (The filter cloth is changed every 10 hr). Here ahout 13501. of water is added over a period of 5 min, while the temperature is maintained at 25°C, and cyclonite is precipitated from the acetone solution in the form of fairly large crystals approximately 90% of the total are longer than 0.1 mm. The precipitated cyclonite is separated on a vacuum filter. 

The Neutralization Module accepts the ton container contents from the TCC module and destroys the agent batchwise through hydrolysis with water followed by caustic addition. The Neutralization Module consists of three units, each located inside a Containment Level A toxic cubicle. There are two HD Reactors and one TCC Effluent Tank in each of the three neutralization units. In each neutralization unit, drained agent held in the Agent Holding Tank is processed in batch neutralization reactions. The rinse and spray water from the TCC Module and spent decontamination solution are stored in the TCC Effluent Tank and process in separate batch reactions. In the neutralization reaction HD reacts with water to yield the principal hydrolysis products of thiodiglycol and hydrochloric acid. After the hydrolysis is complete and sample analysis results confirm the destruction of HD, 18 percent sodium hydroxide is added to the reactor to raise pH in order to increase the hydrolysate biodegradability. The hydrolysate is then pumped to the Hydrolysate Tank in the VOC Treatment Module. 

The simplest type of ultrafiltration system is a batch unit, shown in Figure 6.17. In such a unit, a limited volume of feed solution is circulated through a module at a high flow rate. The process continues until the required separation is achieved, after which the concentrate solution is drained from the feed tank, and the unit is ready to treat a second batch of solution. Batch processes are particularly suited to the small-scale operations common in the biotechnology and pharmaceutical industries. Such systems can be adapted to continuous use but this requires automatic controls, which are expensive and can be unreliable. 

Stirring was continued for another 15 min after which the contents were allowed to remain at rest for 30 min in order to set in two separate layers. The batch was then drained off through a sight-glass, the twice used acid being directed into the superdetoluator, and the nitro compounds to a pressure-egg, which in turn conveyed them into a tank. From this the nitro compounds were transferred for further trinitration. 

Recall Figures 1.4 and 1.5 which show and illustrate, respectively, how condensed solvent normally returns to the sumps after condensation upon the primary cooling coils. It drips from the coils and then falls into a narrow channel or tray (noted at left in Figure 1.5). From the tray, condensed solvent drains into the water separator where it is decanted (separated by gravity) and returned to either the solvent storage tank or the rinse sump. 

The lower half of the settler is a low turbulence zone that allows the sulfur to settle on the bottom cone and gradually drain to the clarifier/filter system through a diaphragm control valve. The clarifier/filter system separates the sulfur product from the residual catalyst solution in the slurry. Most of the catalyst solution is decanted via the clarification mode. The primary use of the filters is to attain final dewatering after the clarifier tank is full of sulfur. The filtered solution is pumped back to the oxidizer through a surge tank, while the damp sulfur-cake is mechanically removed from the filter and stored. 

Offshore, produced water can be piped directly overboard after treating, or it can be routed through a disposal pile or a skim pile. Water from the deck drains must be treated for removal of "free" oil. This is normally done in a skim vessel called a sump tank. Water from the sump tank is either combined with the produced water or routed separately for disposal overboard. 

---