Skip to main content

Solid Waste

 SOLID WASTES 



  • Solid wastes refer to everything that goes out in trash. 
  • Municipal solid wastes are wastes from homes, offices, stores, schools, hospitals, etc., that are collected and disposed by the municipality. 
  • The municipal solid wastes generally comprise paper, food wastes, plastics, glass, metals, rubber, leather, textile, etc. 
  • Burning reduces the volume of the wastes, although it is generally not burnt to completion and open dumps often serve as the breeding ground for rats and flies. 
  • Sanitary landfills were adopted as the substitute for open-burning dumps. 
  • In a sanitary landfill, wastes are dumped in a depression or trench after compaction, and covered with dirt everyday. 
  • Landfills are also not really much of a solution since the amount of garbage generation specially in the metros has increased so much that these sites are getting filled too. 
  • Also there is danger of seepage of chemicals, etc., from these landfills polluting the underground water resources. 
  • A solution to all this can only be in human beings becoming more sensitive to these environment issues. 
  • All waste that we generate can be categorised into three types – 

(a) bio-degradable, 

(b) recyclable and 

(c) the non-biodegradable. 

  • It is important that all garbage generated is sorted. 
  • What can be reused or recycled separated out; our kabadiwallahs and rag-pickers do a great job of separation of materials for recycling. 
  • The biodegradable materials can be put into deep pits in the ground and be left for natural breakdown. 
  • That leaves only the non-biodegradable to be disposed off. 
  • The need to reduce our garbage generation should be a prime goal, instead, we are increasing the use of non-biodegradable products. 
  • Just pick any readymade packet of any ‘good quality’ eatable, say a biscuit packet, and study the packaging – Note that at least one layer is of plastic. 
  • We have started packaging even our daily use products like milk and water in polybags!! In cities, fruits and vegetables can be bought packed in beautiful polysterene and plastic packaging –  Contribute heavily to environmental pollution. State Governments across the country are trying to push for reduction in use of plastics and use of eco-friendly packaging. 
  • We can do our bit by carrying cloth or other natural fibre carry-bags when we go shopping and by refusing polythene bags.

Comments

Popular posts from this blog

ELECTROCARDIOGRAPH

  Electrocardiograph (ECG)  You are probably familiar with this scene from a typical hospital television show: A patient is hooked up to a monitoring machine that shows voltage traces on a screen and makes the sound “... pip... pip... pip..... peeeeeeeeeeeeeeeeeeeeee” as the patient goes into cardiac arrest.  This type of machine (electro-cardiograph) is used to obtain an electrocardiogram (ECG). ECG is a graphical representation of the electrical activity of the heart during a cardiac cycle.  To obtain a standard ECG, a patient is connected to the machine with three electrical leads (one to each wrist and to the left ankle) that continuously monitor the heart activity.  For a detailed evaluation of the heart’s function, multiple leads are attached to the chest region.  Here, we will talk only about a standard ECG.  Each peak in the ECG is identified with a letter from P to T that corresponds to a specific electrical activity of the heart.  The P-wave represents the electrical excitati

AIR POLLUTION

AIR POLLUTION   We are dependent on air for our respiratory needs.  Air pollutants cause injury to all living organisms.  They reduce growth and yield of crops and cause premature death of plants.  Air pollutants also deleteriously affect the respiratory system of humans and of animals.  Harmful effects depend on the concentration of pollutants, duration of exposure and the organism.  Smokestacks of thermal power plants, smelters and other industries release particulate and gaseous air pollutants together with harmless gases, such as nitrogen, oxygen, etc.  These pollutants must be separated/ filtered out before releasing the harmless gases into the atmosphere.  Electrostatic precipitator There are several ways of removing particulate matter; the most widely used of which is the electrostatic precipitator, which can remove over 99 per cent particulate matter present in the exhaust from a thermal power plant.  It has electrode wires that are maintained at several thousand volts, which p