Best answer: What is recycle ratio in wastewater treatment?

What is the recycle ratio in wastewater?

Recycle ratios are typically between 1 and 20 with the total particulate flow through the boiler limited to between 2 and 3 times the fly ash flow.

What is recycle ratio?

A recycle ratio is a key profitability measure of the oil and gas industry. The ratio is calculated by dividing the profit per barrel of oil by the cost of finding and developing that barrel of oil.

What is sludge recycle ratio?

The sludge recycle ratios in the range from 0.3 to 1 were consi- dered. … It was observed that at HRT of 16 h and the sludge recycle ratio of 0.85, the COD removal and SVI were 95 and 85 %, respectively. The sludge recycle ratio greater than 0.85 had no significant effect on the COD removal.

How do you calculate flow rate of recycling?

When we study recycle systems, we are often asked to calculate the recycle ratio. Usually, this is found by dividing the mass flow of the recycle stream by the mass flow of the “fresh feed” entering the system.

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What is a recycle reactor?

Recycle reactors are used when the reaction is autocatalytic, or when it is necessary to maintain nearly isothermal operation of the reactor or to promote a certain selectivity (see Section 5.6. … We shall define the recycle parameter R as the moles recycled per mole of product removed at point Q.

What is sludge recycle?

Sludge is usually treated before disposal or recycling in order to reduce its water content, its fermentation propensity or the presence of pathogens. Several treatment processes exist, such as thickening, dewatering, stabilisation and disinfection, and thermal drying. The sludge may undergo one or several treatments.

What is recycle ratio oil and gas?

RECYCLE RATIO is a key measure of profitability in the oil and gas industry. The ratio is calculated by dividing the profit per barrel of oil by the cost of finding and developing the barrel of oil.

What is F&D cost?

Finding and development (F&D) refers to costs incurred when a company purchases, researches and develops properties in an effort to establish commodity reserves. … Finding and development costs are also known as finding costs.

What is purge in chemical engineering?

Purging is the act of removing the contents of a pipe or container and replacing it with another gas or liquid. Purging is crucial in pipeline, piping, welding and industrial process. … Purging can prevent a hazardous mixture of gas and air.

What is SVI in wastewater treatment?

Sludge Volume Index (SVI) is used to describe the settling characteristics of sludge in the aeration tank in Activated Sludge Process. … It is defined as ‘the volume (in mL) occupied by 1 gram of activated sludge after settling the aerated liquid for 30 minutes’.

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What is the difference between MLSS and Mlvss?


The difference is the MLSS is total solids weight and MLVSS is the volatile fraction of the total solids (usually just biological solids – but can also include fibers and other organic influent solids).

What are the advantages of recycle sludge to aeration tank?

Advantages of Activated Sludge Process

  • Low installation cost.
  • Good quality effluent.
  • Low land requirement.
  • Loss of head is small.
  • Freedom from fly and odor nuisance high degree of treatment.