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INDUSTRIAL HAZARDOUS WASTE TREATMENT
 
I. THE PHYSICO-CHEMICAL TREATMENT FACILITY
  • The Physico-Chemical Treatment Facility is designed for the treatment of liquid waste with cyanide, acid wastes, alkali wastes, wastes with inorganic chemicals or heavy metals and those containing large amount of organic pollutants (high in Chemical Oxygen Demand).

    The facility utilizes chemical and physical batch reaction processes such as oxidation, reduction, precipitation, neutralization, mixing, sedimentation and filtration, based on waste characterization. The treated water is passed through a sand filter for ion removal prior to Biological Wastewater Treatment. The final effluent passes DENR-DAO 35 standard. The sludge generated is treated at the Solidification/Stabilization Facility prior to disposal in the Secure Landfill.



II. THE SOLIDIFICATION / STABILIZATION FACILITY
  • The Solidification/Stabilization Facility is designed for the treatment of sludge or solid waste with heavy metals such as lead, arsenic, chromium, cadmium, boron, selenium, mercury and other waste with inorganic chemicals.
  • Based on the initial TCLP (Toxicity Characteristic Leaching Procedure) test result, the waste is carefully mixed with the appropriate amount of binder/additive and water inside the mixer. Pre-treatment of waste are necessary for some wastes which includes crushing / shredding or neutralization. After achieving the desired consistency and proper mixing time, the mixture is placed into moulds and stored for drying and curing. Curing takes about 3-8 days. Stabilized waste is disposed in the Secure Landfill after passing the final TCLP test. as per U.S. EPA Procedure SW 1311.

 
III. THE SOLVENT RECOVERY FACILITY
  • The Solvent Recovery Facility is designed to recover organic solvents such as spent alcohols, waste acetone, etc.
  • Recovery is performed using a batch distillation process. Spent solvent is heated inside a distillation vessel. As it evaporates it passes through the condenser coil for cooling, and then condenses into a more concentrated solvent.
  • The slurry residue remaining at the bottom of the unit, which is 10-15% of the original batch volume, is treated biologically or by PhysicoChemical Treatment or Solidification/Stabilization then to final disposal in the Secure Landfill.


IV. THE SECURE LANDFILL
  • The Secure Landfill has a double geomembrane liner with drainage and leachate collection systems complete with High Density PolyEthylene (HDPE) piping, for the early detection, collection, removal and treatment of any possible leachate. The liner material is a high quality HDPE, which has excellent resistance to UV radiation and is suitable for exposed conditions and projects requiring greater slopes.
  • Strict acceptance criteria will be followed for the disposal of waste in the landfill. Aside from the TCLP values, moisture content will also be controlled. This will ensure minimal leachate collection.
Leachate Treatment

  • All the solids disposed in the landfill are fully stabilized and immobilized. The expectedleachate can be characterized by the TCLP test given by RA 6969 Title III Guidelines.
  • The concentration levels of the leachate are lower than those predicted by the TCLP test owing to further dilution by additional water percolation.
  • In the event however those residual contaminants are released, although the instance of this occurring is very remote, the leachate is collected in a centralized collection system leading to a sump and then pumped directly to a holding tank. The holding tank is cylindrical, epoxy-lined to avoid water-vessel reaction.
  • A sewage grinding pump is placed at the bottom to prevent the settling of sludge. The sludge is collected and brought to the Solidification/Stabilization Facility for treatment.
  • The collected leachate from the holding tank will be channelled to the Physico-Chemical Treatment Facility or the main treatment tank for the removal of Physical and chemical contaminants in the wastewater to ensure safe and acceptable discharge levels. This is only an option in case leachate has inorganic chemical contaminants.

LANDFILL BED LINER LAYOUT


V. THE BIOLOGICAL WASTEWATER TREATMENT FACILITY
  • All wastewater streams coming from the septic tanks, oil and water separator, physical-chemical treatment plant, washings and rain water collected from the landfill sump that might contain organic contaminants will be sent to the Biological Wastewater Treatment Facility for treatment. The wastewater streams will be partially aerated, thoroughly activated for digestion, will undergo aerobic and aerobic digestion to remove organic pollutants. The water passes through a polishing filter prior to final effluent discharge which passes DENR-DAO 35 standard.


VI. DECONTAMINATION AND DESTRUCTION FACILITY for Materials Contaminated with Toxic Substance

  • The Decontamination and Destruction Facility is where containers and other materials are washed and/or destructed for recycling or disposal. It is equipped with shredder, baler and washings collection system.
  • Wastes subject for decontamination and destruction are containers previously containing toxic waste. Identification and labels of containers are removed and washed with appropriate solution. Washings are collected and treated at the Physico-Chemical Treatment Facility. Recyclable containers can be reused for the same previous waste type. Non-recyclable containers are crushed or shredded and solidified. Solidified material are tested for TCLP and disposed in the Secure Landfill.
THE BULB CRUSHER

  • The Bulb Eater is the machine that processes, or crushes, spent fluorescent lamps into small fragments. The crushed glass is compacted into 55-gallon containers. Because fluorescent bulbs contain mercury, a toxic heavy metal, it requires special handling and disposal. It also involves careful disposal of any broken glass, as well as any loose white powder (fluorescent glass coating).

  • Bulbs are crushed by piece. The white powder as well as the mercury vapour is filtered by bulb eater filtration system. It goes through a two-stage filtering process in the case. The second stage High Efficiency Particulate Air (HEPA) filter acts as a polishing filter and captures over 99.97% of the remaining particulate. The mercury vapour is then blown out of the case and through a third and final carbon filter. The carbon filter captures the mercury vapour but also neutralizes it by converting the vapour to mercuric sulphide, which is non hazardous. Clean air comes out of the bulb eater exhaust vent. The filters and crushed bulbs are encapsulated and disposed in the Secure Landfill.



  • The Laboratory housed various equipments used for quality monitoring of treatment processes. Top-of-the line equipments includes Atomic absorption Spectrophotometer with HVG for the analysis of metals such as mercury, arsenic, lead, nickel, copper, cadmium among others, Gas Chromatograph for solvents analysis, Oxitop system for BOD5 analysis and UV-Vis for colorimetric determinations of parameters specified by government for effluent and landfill monitoring.
Analytical capabilities include:
  A. Water and Wastewater
    i. pH
    ii. Metals (Cd, Cr, Pb, Cu, Ni, Zn, Hg, As)
    iii. COD
    iv. BOD5
    v. Color
    vi. Total Suspended Solids
    vii. Temperature
    viii. Acidity
    ix. Alkalinity
    x. Dissolved Oxygen
    xi. Conductivity/Salinity
    xii. Oil and Grease
 
  B. Solids / Sludge
    i. Moisture
    ii. pH
    iii. Specific Gravity
    iv. TCLP (Cd, Cr, Pb, Cu, Ni, Zn, Hg, As, Ba, Se, Sb, Tl)
       
  C. Solvents
    i. Purity (Acetone, IPA, Toluene, etc.)
    ii. Specific Gravity
    iii. Moisture
       

 



VII. THE STORAGE FACILITY
  • The Storage Facility is equipped with the Occupational Health and Safety provisions such as:

  1. Proper ventilation and lighting
  2. Acid-resistant flooring
  3. Drain and spill control sumps
  4. Fire prevention and alarm systems
  • It uses a Rack and Pallet system wherein wastes sit on pallets and are stored in horizontal rows with multiple levels. This modern system allows warehouse inventory to be stored more efficiently (called maximum storage density). Forklifts and Reach trucks are used to place the loaded pallets onto the racks for storage considering their size and weight.

For operation-related inquiry, send it to operations@cleanway.com.ph