Waste Treatment Plant HOME > Divisions > Waste Treatment Plant

Updated:2014/06/19
Introduction:

Waste produced by laboratories at schools and research institutions as well as that produced by industrial testing facilities differs from waste produced by normal factories. Such waste is small in quantity, complex in terms of types, generally toxic, flammable, corrosive, and often includes newly added materials; most is dealt with through contract processing. However, waste management methods have been continually updated and have become more strongly regulated. Legal processing methods of contracted processing enterprises have been limited, leading to large increases in waste management fees. Due to problems of an inability to find legal processors under financial constraints, some schools have been forced by excessively high waste management fees to store toxic waste within campuses, causing severe danger to teachers and students.

The Ministry of Education has responded to the problem in the 400th Department of the Treasury review “Combined Planning Report on Improving Pollution Prevention Public Facilities for School Campuses at Various Levels” in the expectation of satisfactorily resolving processing problems and potential threats to campus safety arising from laboratory waste (including waste liquids) for schools at various levels and associated laboratories supervised by education administrative institutions. $350 million NT was allocated to publicly select “Campus Laboratory Waste Management Processing Centers” for construction through cooperation with schools. National Cheng Kung University was selected to establish an Environmental Resource Research and Management Center (also known as the Environmental Resource Center) and to establish a laboratory waste recycling stations and a laboratory building at the An-nan Campus to properly process laboratory waste from across the nations and to provide processing, educational, research, and demonstration services.
 
The establishment of the Environmental Resource Center could not only effectively process waste produced by schools at various levels but could also gradually develop new processing technologies in response to different needs. The Environmental Resource Center is the nation’s first and, currently, only institution possessing laboratory waste processing capabilities as well as performing scholarly research on the subject. Laboratory waste processing is performed according to the principles of stability, [resourcification], and harmlessness, and involves three processing system operations of physical-chemical processing, incineration, and melting in order to detoxify and stabilize toxic waste and further perform recycling. In the course of processing, the overall operations of the Environmental Resource Center, which do not emit harmful gases, liquids, and solids, can aid schools at various levels within the nation in appropriately processing laboratory waste and restoring safe and clean learning environments to schools.
 
Objectives
   Funded by Ministry of Education
   Proper storage, collection, and treatment of wastes.
   Multi-services on treatment, teaching, research & demonstration
   Treatment objectives
    – Approach zero waste, high efficiency& low pollution
    – Wastewater recycling and reuse
    – Energy recycling

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Major Affairs or Equipment:

Design Concepts

Waste Classification
 •Wastes sources
      –Lab. waste from universities and schools in Taiwan
 •Waste liquids
      –Organic waste liquids
           • with or without chloride
      –Inorganic waste liquids
           • cyanide, mercury, acid, base, metals
      –Waste Oils
 •Solid Wastes
      –Combustible
      –Incombustible
 
 Processing System
1. Incineration processing system
 The incineration processing system primarily includes the units of the feed, combustion chambers, cooling towers, a dust collector, a [packing scrubber tower], and a [discharge chimney]. The operations process of the units (see Figure 1) and their conditions are described below:
(1) Feed: Organic waste fluid is fed into the combustion chamber via tubes; a [nebulization device] is used to spray the waste fluid into the combustion chamber for processing. Combustible solid waste is pushed into the combustion chamber by feed mechanisms.
(2) Combustion chamber: this system includes a total of two combustion chambers. This primary chamber has an operating temperature of approximately 850~950°C, while the secondary chamber is maintained around 1,050°C. The waste heat of the secondary chamber provides a source of head for dry sludge dehydration and accepts [synthetized gas] from the metling system for energy recollection.
(3) Cooling towers: this system includes two cooling towers which reduce the temperature of waste gasses escaping from the combustion chamber from 1,050°C to 180°C.
(4) Bag type dust collector: this system includes a total of 200 bag filters which operate in turn to capture particulate pollutants and activated carbon.
(5) [packing scrubber tower]: removes acidic gasses from waste gasses in the system.
(6) Chimney: provides waste gas emissions and has white smoke heating mechanisms and related air pollutant monitoring devices installed.
(7) Designed capacity: 375 kg/h
 
2. Physical-Chemical Processing System
The physical-chemical processing system primarily includes pretreatment, continuous chemical coagulation and sedimentation, and high-level processing units. The operational flow of the various units (see Figure 2) and conditions are described below:
(1)   Pretreatment batch reactor: pretreatment units include cyanide, mercury, acid/basis, and heavy metal pretreatment troughs, which perform pretreatment for nonorganic liquids of widely varying concentrations.
(2)   Continuous chemical coagulation and sedimentation: waste water from pretreatment and produced by incineration and melting systems are introduced into this unit for chemical coagulation and sedimentation. Primary processing methods include oxidization, neutralization, sedimentation, absorption, separation, and coagulation.
(3)   High-level treatment: high-level treatment facilities such as reverse osmosis, activated carbon, and ion exchange resin is used to process waste water into cooling water for use in incineration or melting systems, thereby achieving the purpose of recycling and reusing water.
(4)   Designed capacity: 624 kg/h
 
3. Plasma melting processing system
The melting processing system primarily includes input, reactor, air pollution control facilities, and chimney units. The operational flow of the various units (see Figure 3) and conditions are as described below:
(1)   Input: the input system includes nonflammable solid waste input conveyor devices as well as incineration ash and dried sludge input devices. In addition, in response to restorative atmosphere operations, this input system is equipped with two gate and nitrogen sealing mechanisms to maintain a low-oxygen environment.
(2)   Reactor: the plasma system provides a 1,500°C operating environment for waste processing. Two residue exits are situated below the reactor to emit slag or metal waste or different densities.
(3)   Air pollution control facilities: includes quench towers to reduce waste gas temperature to 180°C and then uses filled scrubber towers to perform remove acidic gases and mercury removal devises to absorb mercury from the air.
(4)   Chimney: provides waste gas exit; equipped with thermal oxidation devices to burn synthetic gases.
(5)   Designed processing load: input 43 kg/h, including 21 kg/h of sludge and 22 kg/h of ash. Other individual compositions are as follows:
Ash (SiO2 34.7%, water 20%, CaO 27.1%)
Sludge (water 10%, Na2SO4 27%, Na2CO3 29.8%, Ca2+ 13.5%, and CaF2 4.5%)
No.500, Sec.3, An-Ming Rd., Annan District , Tainan City, Taiwan 70955   TEL : 886-6-3840136    FAX : 886-6-3840960 Copyright 2009 SERC Reserved.