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Washing Chemicals in wash water reclamation systems-1
by wacle 2012-01-03 16:23:32
1,308 Views, 스크랩 스크랩

Washing Chemicals in Wash Water Reclamation Systems

               Most people now realize that Wash Water Reclamation Systems require the use of

               washing chemicals that do not defeat the water cleaning process.

Most chemical companies now offer “Quick Release” products to fulfill the need for a

good  soap that is effective at removing grease and road film while being unstable

               enough to breakdown in the reclaim process


               The purpose of this communiqe is to offer a greater understanding of the compli-

               cations arising from the use of an incorrect washing detergent and to help in

               locating the “right” detergent that allows for the proper operation of your wash

               water recycling systems.  It is worth mentioning that all systems discharging to

               sanitary sewers through oil/water separators, as well as recycling systems,

               would benefit from heeding the advice offered herein.

 

               The oil and grease deposited on the surface of a dirty vehicle must be sufficiently

               emulsified to the point that they will flow from the vehicle before the emulsion breaks

  down.   If an emulsion is too unstable, re-deposition of the oil and grease  is possible.

  Emulsification occurs when two normally immiscible liquids are successfully mixed.

  One of the liquids (oil, in this case) forms tiny droplets that suspend within the other

  the other liquid(water, in this case) by means of agitation and a detergent.

  The resulting effluent is wash water containing oil that is both mechanically

  and chemically emulsified. The mechanically-emulsified oil will separate from the

  water when the agitation stops and sufficient quiet time elapses allowing for the

  oil to surface. The water and chemically-emulsified oil, on the other hand, will

  not separate on their own unless the detergent used is designed to allow it to happen

 

               Our days are numbered that we may continue to allow this permanently emulsified

               wastestream to go unchecked out the door of the industrial sector. For some, those

   days are already in the past. The local multi-million-dollar sewer plant cannot handle

   the oil and greases being sent to them, so it is reasonable to assume that a

 $30,000 on-site reclaim system cannot handle it either. It’s simple; before the

 waste wash water can be reclaimed by anyone or anything, the emulsion

 of oil and water must be broken.

 

 Traditionally, users of detergents have discharged the effluent down the drain

               with no thought as to what happened next. Once the user installs an oil/water

 separator or full recycling system, the consequences of emulsification are

 encountered. Chemical emulsification defeats the oil separating capabilities of

 water cleaning systems. returning to the pressure washer operator unimproved.

 In the process, the filters and carbon are fouled rendering them ineffective.

 Remember, there is much to be gained by improving sewer discharges to avoid

 high surcharges caused by excessive oil and grease levels. If wash water is

 discharged to the ground, the generator is liable.

 

               The solution to this challenge was once expensive and not readily available.

 However, for the past couple of years both price and availability have improved

 to the point that these “Quick Release” cleaning agents are almost as common

 as traditional soaps.

               The use of this new breed of soap is wise regardless of your effluent

 disposition method. Quick release can better be said as “unstable emulsifier”,

 not as “non-emulsifier”. Beware the vendor peddling a “non-emulsifying’ soap. 

 Yes, it will work in your wash water reclaim system; no, it will not remove grease

 and oil.

  

               Surfactants (surface-active agents) make water wetter. When water is wetter it

 can penetrate the surface of oils and greases more easily and quickly- an

 important function, if your goal is to clean a greasy piece of equipment.

 Therefore, surfactants are important ingredients in the cleaning chemicals you

 buy-the tricky part being to select the type of surfactants that will provide your

 system with unstable emulsification.

 

  To make things a little more complicated, there are four types of surfactants

  available: cationic, anionic, nonionic, and ampholytic. The manufacturer of your

  reclaim system can guide you to the best type of surfactant for your system.

  Present day technology offers us hair shampoo with a balanced pH (Ph7).

  This is great stuff for your hair, but totally unacceptable for washing industrial

  equipment. There are extremely effective industrial grade soaps with high 

  pH’s (pH12) That work very well on oil and grease while quickly releasing those oils

  and greases within a wash water reclaim system. You can have both a high pH and

  an unstable emulsifier

 

  The wash water reclaim user can be a wiser chemical buyer with the

  following information that will be of assistance in guiding your chemical vendor

  to the correct product for your system:

              

A coupling agent is a critical ingredient in the manufacture of washing

 chemicals. When all of the ingredients are blended in the manufacture of

 washing chemical, a coupling agent is introduced to maintain the

 homogenized condition of the finished product. Without the presence of the

 coupling agent, the solution soon separates into layers made up of the

 individual components of the aggregate and this dog won’t hunt.

 In order to achieve the benefits of “quick release”, clever formulators employ the

 use of monoethanolamine as the coupling agent. Monoethanolamine easily

 evaporates during the washing process. As the monoethanolamine heads out

 of town, the soap begins to break up and the surfactant loses its grip on the

 oil and grease. Now, the reclaim system can do its job as separation of the

 oily contaminants occurs. This type of unstable emulsifier may allow your

 reclaim system to work, but if the breakdown occurs. This type of unstable

 emulsifier may allow your reclaim system to work, but if the breakdown

 occurs too quickly, the oil and grease could re-deposit on the equipment being

 washed.

 
 
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