AST Clean Water Technologies

AST Clean Water Technologies

- Advanced Oxidation Processes System (AOP)

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Advanced Oxidation Processes (AOP) refers to a set of chemical treatment procedures enhanced by Ultra sound and UV activation, designed to remove organic and inorganic materials in waste water.

Contaminants are oxidized by four different reagents: ozone, hydrogen peroxide, oxygen, and air, in precise, pre-programmed dosages, sequences, and combinations. These procedures may also be combined with Ultra Sound reactors, UV irradiation and specific catalysts. This results in the development of hydroxyl radicals.

The AOP procedure is particularly useful for cleaning biologically toxic or non-degradable materials such as aromatics, pesticides, petroleum constituents, and volatile organic compounds in waste water.

The contaminant materials are converted to a large extent into stable inorganic compounds such as water, carbon dioxide and salts, i.e. they undergo mineralization.

A goal of the waste water purification by means of AOP procedures is the reduction of the chemical contaminants and the toxicity to such an extent that the cleaned waste water may be recycled or, at least, dumped into a conventional sewage treatment.

AOP Purposes

The AOP (Advanced Oxidation Processes) is usually used for removing contaminants from waste water coming out of several types of heavy industries like:

  • Petrochemical & Plastic Industry
  • Chemical Industry.
  • Food Processing Industry.
  • Pharmaceutical Industry.
  • Metal and Metal Plating Industry.
  • Textile and Dying Industry
  • RO & NF brine streams  
Conventional AOP Methods

Advanced chemical oxidation processes make use of (chemical) oxidants to reduce COD/BOD levels, and to remove both organic and oxidisable inorganic components. The processes can completely oxidize organic materials to carbon dioxide and water. AST is using a wide variety of advanced oxidation processes.

Chemical oxidation processes using hydrogen peroxide, ozone, combined ozone & peroxide CLO2  Ultra Sound & Ultra-violet enhanced oxidation such as US/UV/ozone, US/UV/hydrogen peroxide, US/UV/air and catalytic reagent. Advanced Oxidation Processes are particularly appropriate for effluents containing refractory, toxic or non-biodegradable materials.

The processes offer several advantages over biological or physical processes, including:

  • Process operability(No biological process)
  • Unattended operation with very small foot print.
  • The absence of secondary wastes (sludge).
  • The ability to handle fluctuating flow rates and compositions.

Conventional oxidation processes are very often high capital and operating costs and not effective in reducing the COD contamination from the waste water.

Conventional oxidation processes such as biological treatment, demands long operating cycle (up to 48 hours) and very big footprint.  

AST AOP Improved Technology

AST has developed the improved AOP technology that supports the standards of the environmental preservation authorities require low COD levels.

The COD level output after conventional waste water treatment of is usually not low enough, and further steps are necessary to enforce the process in order to reduce the excess of COD contamination.

Conventional oxidation processes reduces COD level by aerobic and anaerobic biological digestion. Some of the compounds that create COD in the waste water are not responding to the biological treatment as a result of their chemical nature, some of them are toxic to the digesting micro-organisms, and others need more effective oxidation process in order to be removed from the wastewater.

Chemicals like aromatic rings, phenols, chlorinated carbohydrates, lipids and certain proteins are usually not affected by the biological process.

AST improved the process in the following matter:

  • Operating coasts has been reduced dramatically
  • One operating cycle takes only 30-60 minutes
  • Waste water can be recycled for industry re-use 

All AOP outputs are environmental friendly

We on AST improved the oxidation process by adding the help of free radicals (OH0 + OH-). By adding to the reaction solution, energy sources like: ultrasound cavitations, UV light radiation or catlization by metal ions; free radicals are created and enhance the oxidation process so it produces an overhaul and more intense oxidation process of all COD components.

We developed at AST a method and a computerized software to determine and calculate an effective AOP for a specific chemical based on COD compounds level. 

AOP Applications

We on AST succeeded to fit the improved integrated AOP systems for the following applications:

  • Petro chemical Effluents treatment (COD, turbidity, electricity conductivity, TSS).
  • Polymers and resins factories effluents recovery.
  • Pharmaceutical factories effluent treatment (high load of salinity and COD effluents).
  • Dairy production effluents treatment - (high load of BOD, COD and fat removal).
  • Food processing effluent treatment and recycling.
  • Heavy metal effluents recovery.
  • High capacity cooling tower water recycling.
  • High way service stations effluents treatment.
  • NF & RO brine streams treatment

 Typical AOP System Components

AST AOP systems consist of the following components:

  • Equalization Buffer Tank / Treated Water Buffer Tank - Accumulates the treated water.
  • PLC with HMI (Programmable Logic Controller) - Controls the system and the AOP Process.
  • UV/US Reactors - Enforces creation of free radicals.
  • UV/US Reactors Controller - Controls the UV/US reactors operation.
  • Flow Control Valves and Flow Meters – Controls the flow.
  • Automatic Selector Valves - Controls the flow.
  • Dosing Pumps - Enforces waste water / treated water to flow within the system under pressure.

AOP System –
Typical Continuance Flow - Principle of Operation
 

The following drawing describes a typical AST AOP system principle of operation: Waste water or any other contaminated water flows into a collection tank where they accumulated and ready for AOP. The contaminated water is pumped from the lower section of the collection tank into the US reactors inlet where free radicals, created by the ultra-sound energy are added to the water to highly enhance the oxidation process. Dosing pumps add pre-calculated doses of (chemical) oxidants to the water coming out of the US reactors to complete the oxidation process. The water flows back into the upper section of the collection tank and from there into the treated water buffer tank through another series of dosing pumps. The treated water accumulated within the buffer tank is now ready for re-use or for any other re-cycling process.

The PLC controls all the AOP process through all stages include the US reactor operation, analyzers to measure pH, ORP and Electricity Conductivity.

AOP System – Typical Batch Flow - Principle of Operation

Waste water or any other contaminated water flows into one of the conditioning tanks where they accumulated and treated chemically ready for AOP. The contaminated water is pumped from the lower section of the conditioning tank into the US reactors inlet where free radicals, created by the ultra-sound energy are added to the water to highly enhance the oxidation process.

Dosing pumps add pre-calculated and controlled doses of (chemical) oxidants to the water coming out of the US reactors to complete the oxidation process. The water flows back into the upper section of the conditioning tank and recycled until the oxidation process is end and the COD is destructed.

During this process the second tank was already fill-up and the waste water were treated, ready to start the Advanced Oxidation Process.

At the stage that the process is accomplished in the first conditioning tank, the PLC controller changing the valves start the AOP recycling in the second tank, while the treated water from the first tank are being pumped into the treated water buffer tank.

At this stage the water, free from COD, can be treated either for further advanced treatment like membranes and be recycled as high quality water back to the factory process, or can be dumped into the municipal sewage system or river.

The PLC controls all the AOP process through all stages include the US reactor operation, analyzers to measure pH, ORP and Electricity Conductivity. 

High load contaminated (COD) effluents

 In some industries such as the Pharmaceutical and Chemical industries or Glucose & Proteins industries, the manufacturing process produces toxic and non degradable effluents.

 AST clean water technologies developed a process that can treat these effluents with a fast and cost effective aggressive Advanced Oxidation Process [AOP].

The patented process to calculate the required oxidation agents and free radical combined with inline Ultrasound reactor.

The free radicals (OH0 + OH-) are achieved by adding to the reaction the energy, by the form of ultrasound cavitations catlyzation by metal ion free radicals are created and enhanced   the oxidation process which result in complete oxidation of all the COD components.

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