As early as World War I when planes had openair cockpits, pilots began seeking flight jackets to provide warmth and comfort in the bitter temperatures of the open skies. Thus the start of the historical “Field Jacket” was born.

Over the years, there have been many variations from the unofficial and popular early leather bomber jackets of 1915 through 1917 to later official military issue bomber jackets such as the 1931 “A2 Bomber Jacket.”

Historically, pilots and crews [grabbed|used|wore[/spin] whatever they could [acquire|find[/spin] because no specific or official coat was issued to address the extreme-hazardous cold and weather conditions the pilots faced in world war I. Weighty long leather jackets rapidly became popular with tight snug cuffs around the wrists, tight fit around the waists, and high collars to help protect from the cold. These are the design principles that are at the essence of what historically we commonly think of as being Leather Bomber Jacket.

At the close of WWI, the United States army started the Aviation Clothing Board and started distributing these mighty leather jackets.

By the time WW II broke out, the United States Air Corp was distributing the A-2 Bomber Jacket. The Navy and Marine Corp were issuing a similar jacket that was known as the G-1.

As aircraft sophistication progressed throughout the war, airplanes were now flying at significantly higher altitudes and radically higher speeds. Temperatures inside these planes – often flying with open compartments – fell! And their stylish bomber jackets started to give way to a much warmer jacket with a lining of wool or fur. These new jackets were popularized by the B3 Bomber Flight Jacket, a large wool and fur lined jacket with large cargo pockets.

Ground crew and flight crews soon adopted the pilot’s B3 Bomber Jacket, and the new B7 Flight Jacket became the instant rage.

A decade later introduced the high-tech age of the jet with an enclosed compartment and now attention needed to be paid to the warmth, comfort, and safety of the pilots. The B-15 Flight Jacket was designed out of nylon and other synthetic materials to keep the pilot both warm and dry. The lighter weight and more flexible style was also appreciated. As jet technology continued to develop, the MA-1 jacket removed its fur collars because they interfered with the harness of the pilot’s parachute. Today, you can often find both the B-15 and the Leather MA1 Flight Jackets with and without the fur collars.

A functional Leather Bomber Jacket is considered both a stylish and practical piece of clothing. Suitable for a night out on the town or a functional outdoor excursion – and must be in every man’s closet.

To explain the nature of hybrid biological treatment it is first necessary to explain what to water treatment experts is known as biological treatment.

Biological treatment is a process to remove dissolved organic matter from wastewater. To do this. sewage microorganisms are cultivated and added to the wastewater. This type of treatment is provided by completely mixing aeration tanks, and the biologically treated waste is directed to a means of clarification that separates the biological solids from the treated liquid. The clarified liquid is then removed and becomes the treated effluent which is discharged.

Our video below shows an example of a hybrid biological treatment process which in this case is being used to treat landfill leachate (which is the polluted water from a landfill):-

Biological treatment is a natural process and is the process whereby contaminants in soil, sediments, sludge or groundwater are transformed or degraded into innocuous substances such as carbon dioxide, water, fatty acids and biomass, through the action of microbial metabolism.

Biological processes are typically a low cost solution when compared with alternatives and for that reason will always be high in the options considered by water process designers. For what they do for us biological treatment is a highly successful method.

Pressures to Improve Upon Simple Biological Aeration Treatment

However, increasingly, higher water discharge quality is being required and environmental regulators worldwide are listing additional substances which must now be removed in addition to the simple biologically treatable contaminants. Simple biological treatment by aeration in the presence of a biological sludge alone, will no longer be adequate as population pressure on watercourses increases.

Population growth is reducing the ability of water regulators to allow the use of the old standby of relying on the ample dilution available when a small sewage works discharges its treated effluent into a large river. In other words, it used to be acceptable to use the natural processes in our rivers to complete the job we started but only 80% (say) completed, in our sewage works – but is less so now.

Furthermore, neither solids removal nor disinfection alone can be guaranteed to effectively remove viruses, or parasites such as cryptosporidium and giardia, and it has limited effectiveness in removing soil bacteria which will be present although not nearly in such high concentrations as in the untreated water.

So it should now be clear what simple biological treatment is and that something more than just biological treatment is now needed.

Hybrid Biological Treatment

So, to meet this challenge hybrid biological treatment processes have been devised which are designed to utilize the same breakdown mechanisms employed by nature in biological aeration treatment to degrade nutrients, but also include other biological and physical processes as well.

Also, toxic chemicals that persist in nature, such as heavy metals, may be present in the sewage and they can survive biological treatment systems and therefore, hybrid biological treatment systems are necessary to remove them when the environmental regulator requires this.

The best known type of hybrid biological treatment system that combines secondary treatment and settlement is the sequencing batch reactor (SBR). In this process the incoming raw sewage is mixed with activated sludge and then further mixed and aerated. The resultant mixture (mixed liquor) is then allowed to settle, producing a high quality effluent – plus a waste activated sludge.

Waste activated sludge produced during biological treatment processes is usually stabilized by aerobic digestion in which the degradable solids are oxidized by prolonged aeration, and self digest. Nevertheless, other options such as incineration and anaerobic digestion are also used.

The following processes have been included in hybrid biological treatment plants, and no doubt there are others that could be added:-

• Irrigation
• Micro-strainers
• Wet air oxidation
• Stripping
• Reverse Osmosis
• Activated Carbon Absorption
• Anoxic biological treatment
• Reed Beds

An old safe driving slogan pointed out that while a driver may have the right of way, if the other person did not obey traffic laws, they could be dead right. By teaching a driver to be constantly aware of their surroundings, and it saves just one accident, the avoidance makes the defensive driving training justified in terms of time and possible injuries resulting from an accident.
There are a lot of bad drivers out there. Accidents happen on the evening news every day. Traffic control cameras have captured some incredible crashes. So, along with the horrible sights of motor accidents, the news might talk a lot about the need for a defensive driving. What is defensive driving? Despite the name, driving defensively has nothing to do with weaponry.
Everyone who has ever paid a car insurance bill would like for it to go down instead of up. You may be able to get a lower insurance bill if you take a defensive driving course Check with your car insurance company for details. If they say yes, then you have to find a driving school
Most people consider driving a vehicle as part of their job responsibilities a major concern for possible injury. One of the defensive driving statistics that back this fear is the 30 percent of traumatic fatalities, as well as over 10,000 hours of lost time accidents occurred in vehicle crashes. With companies that have initiated defensive driving classes, that number has dropped significantly to about 10 percent in worker related deat
Defensive driving tips from the experts advise people on providing appropriate visibility as they drive their cars. The windows should be clean and clear of any obstructions. The mirrors that provide a view of the road on the sides and back of the car should be set in appropriate positions so the driver can view the other cars on the streets. Defensive driving tips from the experts suggest checking all of the gauges that indicate the condition of the vehicle
An old safe driving slogan pointed out that while a driver may have the right of way, if the other person did not obey traffic laws, they could be dead right. By teaching a driver to be constantly aware of their surroundings, and it saves just one accident, the avoidance makes the defensive driving training justified in terms of time and possible injuries resulting from an accident.
The ultimate reason as to why defensive driving training will benefit you is no doubt that you will improve your overall skills as well as awareness and thus keep the roads in your state and country safe for yourself as well as for others.