Sludge treatment process and disposal, Biology

Assignment Help:

Sludge treatment and disposal: most of the suspended solids and some of the dissolved organic solids, in a converted form, are separated from the main flow of the, in the form of sludge. The quantity and the characteristics of sludge depend upon its origin. In general, the sludge contains 92-98% of moisture. The higher organic content of the sludge demands further treatment prior to its final disposal either on land or into the sea.          

Sludge treatment process:  sludge treatment may include all or a combination of the following unit operation and process-

        (1) Thickening (2) digestion (3) conditioning (4) dewatering (5) incineration

  • Thickening is meant for the reduction of moisture content of the sludge.
  • Digestion is a biological method of treatment and is meant of the reduction of organic content of the sludge. The digestion may be accomplished under either aerobic or anaerobic conditions.
  • Condition improves the drainability of the digested sludge, and may be accomplished by any of the following process like elutriation, chemical conditioning, heat treatment; freezing etc. chemical conditioning consists of addition of some coagulants like ferric chloride, lime, alum etc.
  • Dewatering is accomplished either by air drying in sand, drying beds, or by mechanical means using vacuum filtration, heat drying, centrifugation etc.
  • Dewatered sludge may sometimes require further treatment such as incineration.
  • The ultimate disposal of dewatered sludge after incineration may be on to the land or into the sea.

 

 


Related Discussions:- Sludge treatment process and disposal

What do you mean by primary visual and auditory cortex, Q. What do you mean...

Q. What do you mean by Primary Visual and Auditory Cortex? Primary Visual Cortex - in posterior aspects of occipital lobes.  Receives visual information from optic nerve (crani

What are the cells that form the cartilaginous tissue, Q. What are the cell...

Q. What are the cells that form the cartilaginous tissue? The main cells of the cartilages are the chondrocytes originated from the chondroblasts that secrete the intersticial

Amino acids, An amino acid is amphiprotic (have both acid and base)  ...

An amino acid is amphiprotic (have both acid and base)              o    Some are polar, non polar, acidic or basic List of amino acids (red are non-polar, yellow are

Test tube baby, TEST TUBE BABY - Ova are fertilized in laboratory di...

TEST TUBE BABY - Ova are fertilized in laboratory dish (in vitra) containing a nutrient broth . It may be artificial insemination donor (AID) / Artificial insemination h

Region of the injury in the axial skeleton, what major nerve do you think i...

what major nerve do you think is being compressed when a person often feel pain in the posterior surface of the thigh radiating to the area behind the knee and where is the likely

Arthropod classes characterized to the body division, Q. How are the three ...

Q. How are the three major arthropod classes characterized according to the body division? In arachnids and crustaceans the head is fused with the thorax forming the cephalotho

Explain law of the transmission of acquired characteristics, What is meant ...

What is meant by the law of use and disuse and by the law of the transmission of acquired characteristics? According to the law of use and disuse the characteristics of a body

How is the early diagnosis of genetic diseases usually done, How is the ear...

How is the early diagnosis of genetic diseases usually done? The Genetic disease may be diagnosed in the prenatal period by karyotype analysis, in case of aneuploidies, or by D

Which type of cell came first in evolution, Which type of cell came first i...

Which type of cell came first in evolution - the eukaryotic cell or the prokaryotic cell? This is an interesting problem of biological evolution. The most accepted hypothesis a

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd