remove contaminants that missed in the primary and secondary treatment and removal of
      suspended solids, refractory organics and toxic components. Tertiary physical processes are
      filtration and carbon absorption. Chemical process includes precipitation, oxidation and
      neutralization. The biological processes involve biodegrading. Organisms such as bacteria, fungi,
      yeasts and algae are commonly used to break down the organic matters. The cell tissues are then
      removed from the treated water by physical method.
            Air Pollution Control Equipment: Industrialization and urbanization have resulted in a
      profound deterioration of India’s air quality. India’s most severe environmental problem, come
      in several forms, including vehicular emissions and untreated industrial smoke. Air pollution,
      especially in metropolitan cities and large towns has assumed great significance with the
      adoption of stringent environmental control standards for various industries. Hence the pollution
      control equipment industry has acquired importance. Further judicial pronouncements have
      given a definite direction and urgency for adoption of air pollution control measures. The choice
      of control method depends on factors such as the nature of pollutant, flow-rate (amount of
      pollutant emitted), particle size and desired collection efficiency. The air pollution control
      equipments are broadly classified under the categories such as settling chambers, cyclone and
      multi-cyclones, bag filters, wet scrubbers, spray tower, venturi scrubber, ionizing scrubber and
      electrostatic precipitator.
            Industrial Gears: Industrial gears comprises mainly gears and gear boxes. Gears are used
      for two basic purposes: increase or decrease of rotation speed and increase or decrease of power
      or torque. Gears being an important part of a machine have immense usage within various
      industries. These industries include automotive industries, coal plants industry, steel plants
      industry, paper industry, in mining and many more. In these industries they behold a wide area of
      application. They are used in conveyors, elevators, kilns, separators, cranes and lubrication
      systems. Gearbox is defined as a metal casing in which a train of gears is sealed. The
      manufacture of gears and gear boxes involve high precision machining and accurate assembly as
      mechanical power is to be transmitted noiselessly and with minimum losses. Different types and
      sizes of gears such as spur gears, helical gears, worm gears, spiral gears and many other kinds
      are manufactured in the country. The demand for gears and gear boxes predominantly depend on
      the growth of industrial machinery, machine tools, and consumer and automobile sector.
      Considering the industrial growth prospects, particularly in automobile sector, the demand for
      gears and gear boxes is expected to grow at a healthy pace.
            Wood-based Industry: Plywood, veneers of all kinds and other wood based products such as
      particle board, medium density fibre board, etc., form the major segment of this industry in India.
      The industry comes under the de-licensed category.
            Watch Industry: The watch industry in the country comprises units both in the organized as
      well as the small scale sector. The organized sector contributes 40 per cent of the total demand
      while the rest is met by the unorganized sector. Most of the watches are being manufactured
      under the electronic system.
      Central Public Sector Enterprises
            The Ministry of Heavy Industries and Public Enterprises, comprising the Department of
      Heavy Industry and the Department of Public Enterprises, functions under the charge of Cabinet
      Minister (Heavy Industries and Public Enterprises). There is a Minister of State for Heavy
      Industries and Public Enterprises. The Ministry promotes the development and growth of three