What is the working principle of UASB?

What is the working principle of UASB?

UASB uses an anaerobic process whilst forming a blanket of granular sludge which suspends in the tank. Wastewater flows upwards through the blanket and is processed (degraded) by the anaerobic microorganisms. The upward flow combined with the settling action of gravity suspends the blanket with the aid of flocculants.

What is UASB technology?

It combines modern high-rate treatment technology with simplicity of design. In the USAB reactor, special GAS-SOLID-LIQUID SEPARATORS are mounted which enable collection of biogas and recycle of anaerobic biomass. The avoidance of internal packing in the reactor greatly reduces the cost of reactor construction.

What is the gaseous and product at the end of the UASB process?

What is the product gases released at the end of the UASB process? Explanation: The micro-organisms in the sludge layer degrade organic compounds. As a result, gases are released. The rising bubbles mix the sludge without the assistance of any mechanical parts.

Is the rate limiting step in UASB reactors?

Hydrolysis is commonly the limiting step at low temperature setting. Therefore, the UASB reactors for domestic wastewater treatment having high level of suspended solids are practicable only at higher temperature which may require an outside heat source [32, 40].

Where is Uasb used?

3 Upflow anaerobic sludge blanket (UASB) High rate anaerobic processes, such as UASB reactors, have been used as a pretreatment stage for a variety of processes, including activated sludge and waste stabilization ponds.

Which type of bacteria are used in trickling filters?

Explanation: Facultative bacteria are used in trickling filters. Pseudomonas and Alcaligenes are some of the strains used in these filters. Also, Flavobacterium and Achromobacter are also used in this type of treatment.

What is EGSB reactor?

An expanded granular sludge bed (EGSB) reactor is a variant of the upflow anaerobic sludge blanket digestion (UASB) concept for anaerobic wastewater treatment. The distinguishing feature is that a faster rate of upward-flow velocity is designed for the wastewater passing through the sludge bed.

Which flow is also called as sanitary sewage?

The dry weather flow is also called as sanitary sewage. Explanation: Dry weather flow depends on the type of area served, rate of water supply, population growth, infiltration of groundwater.

What is biogas composed of?

Biogas is composed mostly of methane (CH4), the same compound in natural gas, and carbon dioxide (CO2). The methane content of raw (untreated) biogas may vary from 40%–60%, with CO2 making up most of the remainder along with small amounts of water vapor and other gases.

What are the types of trickling filter?

TYPES OF TRICKLING FILTERS

• 1 Low Rate Trickling Filter (LRTF)
• 2 High Rate Trickling Filter (HRTF)
• 3 Roughing Filter.
• 4 Two-Stage Trickling Filters.

What is the function of trickling filter?

Trickling filters (TFs) are used to remove organic matter from wastewater. The TF is an aerobic treatment system that utilizes microorganisms attached to a medium to remove organic matter from wastewater.