Guangdong Hazardous Waste Comprehensive Treatment Demonstrative Center
(No known alias)
CHWMEG Report Number: H935.0

• Physical-Chemical Treatment – The plant consists of a variety of treatment tanks and reactors for the treatment of a variety of wastes, including emulsions, waste acid and alkali, chromium wastes, cyanide waste, leachate, etc. The PCT operation is divided into two sub-systems: a pretreatment system and a continuous alkaline precipitation system. There are five pre-treatment systems: acid/alkali neutralization, oxidation, reduction, organic waste water treatment, and chlorine waste water treatment. Based on the waste characteristics, the wastes are treated in the pre-treatment system to remove the major hazardous substances, and are then subject to treatment in the continuous alkaline precipitation system. The PCT wastewater will then be transferred to the wastewater treatment plant for further treatment and polishing. The sludges generated from the PCT are dewatered, stabilized, and then disposed in the on-site landfill.
• Wastewater Treatment – Wastewater (mainly sewage, leachate, first flush storm water, and effluent from the physical/chemical treatment system) is subject to equalization in a large tank and then is transferred to anaerobic and aerobic treatment tanks to first degrade the organic pollutants. The wastewater is then transferred into sedimentation tanks for pH adjustment and precipitation to address the inorganic pollutants. The wastewater then passes through sand filters and activated carbon beds for further polishing prior to reuse on-site. Sludge from the wastewater treatment process is dewatered in a filter press and then sent to the landfill for final disposal.
• Stabilization – A stabilization recipe is developed for each batch of waste based on its properties and the proper amounts of reagents are automatically fed into waste blenders to ensure sufficient mixing and chemical reaction with the wastes. Each batch is then subject to testing to ensure that the stabilized material meets the requirements for on-site landfill disposal.
• Incineration – The 13,700 m2 incinerator complex at the site uses rotary kiln technology and has a capacity of 10,000 tons per year (30 tons per day). The system is composed of three main parts: waste pretreatment and feeding system; combustion system; and the flue gas treatment system. The waste pretreatment and feeding system includes eight different ways to feed high calorific waste into the incinerator - 3 for solid wastes and 5 for liquid wastes. All wastes are initially blended (primarily through mixing with loading equipment), and then are fed into the 3 meter diameter x 10 meter long rotary kiln for initial treatment at 850-1200 C for a period of 50-70 minutes, followed by a secondary combustion chamber which burns the off-gases at 1200 C. The flue gas will then enter a waste heat boiler to generate steam for internal use. The flue gas then enters the gas scrubbing system to remove the acid substances, is then subject to activated carbon injection to control dioxin emissions, and then finally the gas is subject to bag house filtration to control dust emissions prior to discharge up the 50 meter high stack. The system is also equipped with an on-line continuous emissions monitoring system.
• Secure Landfill Disposal – The designated landfill area is 106,000 m2, of which approximately 32,000 m2 has been developed to date with a capacity of 308,000 m3. The overall landfill design is for 3.51 million cubic meters in disposal capacity with all 4 phases developed, with an estimated design life of 52 years. The landfil

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