What is the purpose of sludge treatment?
Sludge treatment aims at reducing sludge weight and volume. Clarification: Sludge treatment aims at reducing sludge volume and weight to reduce disposal costs and potential health risks of disposal options. 2. Solids removal can reduce sludge volume.
What is the first step in sludge treatment process?
Clarification: Thickening is often the first step in a sludge treatment process. Primary or secondary clarifier sludge may be stirred (often after addition of clarifying agents) to form larger, more rapidly settling aggregates.
What is the percentage of thickness of secondary sludge?
Clarification: Secondary sludge may be thickened to about 4 percent solids while the primary sludge may be thickened to about 8 or 10 percent solids. 10. What is the percentage of thickness that can be achieved for secondary sludge?
What is activated sludge formed during secondary sewage treatment?
Select the correct statement regarding activated sludge formed during secondary sewage treatment. A small part of it is rapidly pumped back from sedimentation to aeration tank. It absorbs pathogenic bacteria present in waste water while sinking to the bottom of the settling tank.
What is the main focus of sludge treatment?
Sludge treatment is focused on reducing sludge weight and volume to reduce transportation and disposal costs, and on reducing potential health risks of disposal options.
Which of the following is not correct with respect to the effect of oil on treatment system?
11. Which of the following is not correct with respect to the effect of oil on treatment systems? Explanation: The oil in treatment systems can be toxic to anaerobic bacteria; it might interfere with settling and be explosive with pure oxygen.
What is true about activated sludge?
The activated sludge process is a means of treating both municipal and industrial wastewater. The activated sludge process is a multi-chamber reactor unit that uses highly concentrated microorganisms to degrade organics and remove nutrients from wastewater, producing quality effluent.
Which of the following is used in primary treatment of waste water?
Primary Wastewater Treatment Primary treatment of wastewater involves sedimentation of solid waste within the water. This is done after filtering out larger contaminants within the water. Wastewater is passed through several tanks and filters that separate water from contaminants.
Which of the following is not correct with respect to the effect of acid on treatment systems?
12. Which of the following is not correct with respect to the effects of acids on treatment systems? Explanation: The acids in treatment systems may destroy all the essential microbes, upset anaerobic digester and corrode the structures in the treatment plant. 13.
Which of these is not an alternative to activated sludge treatment systems?
6. Which of these is not an alternative to activated sludge treatment systems? Explanation: In the trickling filter, pre-treated sewage is sprayed on the substrate.
What is activated sludge in sewage treatment?
The activated sludge is a process with high concentration of microorganisms, basically bacteria, protozoa and fungi, which are present as loose clumped mass of fine particles that are kept in suspension by stirring, with the aim of removing organic matter from wastewater.
What does activated sludge process do?
The activated sludge process in the treatment of wastewater involves blowing oxygen or air into raw, unsettled sewage. This process smashes the solids. The sewage is bubbled, and sewage liquor is discharged into an activated sludge chamber.
How does activated sludge treatment help in secondary treatment?
Activated sludge is a common suspended-growth method of secondary treatment. Activated sludge plants encompass a variety of mechanisms and processes using dissolved oxygen to promote growth of biological floc that substantially removes organic material.
Which of the following process is not used for waste treatment?
EVAPORATION is not a part of wastewater treatment process.
What does wastewater treatment do?
The basic function of wastewater treatment is to speed up the natural processes by which water is purified. There are two basic stages in the treat- ment of wastes, primary and secondary, which are outlined here. In the primary stage, solids are allowed to settle and removed from wastewater.
Which of these options has the waste water treatment steps in the correct order?
The Wastewater Treatment ProcessStage One — Bar Screening. ... Stage Two — Screening. ... Stage Three — Primary Clarifier. ... Stage Four — Aeration. ... Stage Five — Secondary Clarifier. ... Stage Six — Chlorination (Disinfection) ... Stage Seven — Water Analysis & Testing. ... Stage Eight — Effluent Disposal.
What is sludge treatment?
Sludge treatment aims at reducing sludge weight and volume. Clarification: Sludge treatment aims at reducing sludge volume and weight to reduce disposal costs and potential health risks of disposal options. 2. Solids removal can reduce sludge volume.
What is the first step in sludge treatment?
Answer: a. Clarification: Thickening is often the first step in a sludge treatment process. Primary or secondary clarifier sludge may be stirred (often after addition of clarifying agents) to form larger, more rapidly settling aggregates. 9.
Both (a) and (c)
A small part of activated sludge is pumped back from sedimentation to aeration tank. But it dos not absorb pathogenic bacteria.
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Question
Which of the following statements is true for trickling filter sludge?
Detailed Solution
A trickling filter is a type of wastewater treatment system. It consists of a fixed bed of rocks, gravel, slag, ceramic, or plastic media over which sewage or other wastewater flows downward and causes a layer of microbial slime to grow, covering the bed of media.