INCINERATOR

CTA SAYS:

Then of course there is the 5-7% toxic fly ash (that needs treatment) which means approx 28-30% by weight of what is thermally converted remains as ash that needs daily disposal, ad infinitum.

The ENB’s Elvis AU prefers to state that waste is reduced 90% BY VOLUME by incineration.

Of course the waste management policy relates to stage 2 and stage 3 phases which means THREE INCINERATORS – so where is the recycling ? Currently 48% of local paper etc recycling is claimed – 99% of this is EXPORTED daily to China earning money for Government. With incineration there is no incentive to recycle; indeed they need to be guaranteed feedstocks or they issue their most dioxin emissions on shut down and startup.

From: dereklui@epd.gov.hk [mailto:dereklui@epd.gov.hk]
Sent: 02 February, 2012 14:04
To: James Middleton
Cc: “I[KM]2″@epd.gov.hk; “E[KM]1″@epd.gov.hk; “SI[KM]1″@epd.gov.hk; “S[IP]1″@epd.gov.hk
Subject: Fw: 轉寄: FW: E(12/0072) IWMF

Dear Mr Middleton,

Thank you for your email dated 26.01.2012.

You mention that you find the estimated  22% of bottom ash is low since most UK plants have approximately 25-30% ash to MSW ratios.   On this, you may wish to note that there has been a general downwards trend of % bottom ash production to waste input over the last few years in UK. The following table summaries the recent information from some incineration plants in the UK.

Regarding your question on whether it is the intention to create a new ash lagoon / landfill on the proposed south Cheung Chau island reclamation to handle subsequent disposals after the existing WENT Landfill is filled up, we understand that the proposed south Cheung Chau island reclamation is one of the many options of reclamation which are under public consultation at present.  We consider that the extension of three existing landfills is the most viable way forward with respect to provisions for waste residue disposal in the short to medium term.   We would keep in view of the option of marine landfill sites for longer term development, noting that consideration of this option would require further assessments of the complex technical issues.

Regards,
Derek LUI
E(IP)12/IPG
EPD

From: enquiry@epd.gov.hk [mailto:enquiry@epd.gov.hk]
Sent: Tuesday, January 10, 2012 16:21
To: James Middleton
Subject: Re: E(12/0072) IWMF

Dear Mr Middleton,

Thank you for your email dated 09.01.2012.

Further to the auto-reply, I would like to inform you that our colleagues are processing your request and may need a few more days to come back to you.

Please let me know if you do not hear from us after about 5 working days.  Thank you.

Yours sincerely,
Emily IP
Enquiry/KMU
Environmental Protection Department

IWMF Shek Kwu Chau

Dear Sir, http://www.epd.gov.hk/eia/register/report/eiareport/eia_2012011/EIA/EIA_PDF/S6b_Waste_SKC.pdf

We find your estimates low since most UK plants have approximately 25-30% ash to MSW ratios.

We note the initial flyash and bottom ash will be disposed of at WENT landfill.

Thereafter is it the intention to create a new ash lagoon / landfill on the proposed south Cheung Chau island reclamation to handle subsequent disposals since the capacity of WENT would be insufficient moving forwards ?

Kind regards
James Middleton
Chairman
www.cleartheair.org.hk


Operation Phase
6b.4.1.48 As discussed in Section 2, the IWMF would comprise (a) an advanced thermal
incineration plant of about 3,000 tpd capacity and (b) a demonstration-scale mechanical
treatment (MT) plant of about 200tpd or less for mixed MSW.  The wastes to be
generated from the thermal incineration plant and the MT plant are discussed below.
Incineration By-products
6b.4.1.49 The main waste type to be generated during the operation of the thermal incineration
plant would be bottom ash, fly ash and air pollution control (APC) residues.  For treating
3,000 tpd of mixed MSW, it is estimated that approximately 660 tpd (22%) of bottom ash and
120 tpd (4%) of fly ash and APC residues would be generated from the thermal incineration
plant.
6b.4.1.50 The bottom ash is considered to be inert provided that the combustion systems in the
incinerator are designed and operated correctly, and would be disposed of at landfill.  Fly
ash and APC residues from the flue gas stream can also be disposed of at landfill after
proper treatment. The pollution load in fly ash and APC residues would likely be higher
and more readily leachable than that in bottom ash. Cement solidification or chemical
stabilization would be adopted to pre-treat the fly ash and APC residue to ensure that
they would conform to the proposed Incineration Residue Pollution Control Limits and
leachability criteria shown in Table 6b.7 before disposal

6b.4.1.52 To confirm that the bottom ash, and the treated fly ash and APC residues of the IWMF
would not contain elevated levels of heavy metals and as a precautionary measure, it is
proposed that TCLP tests be carried out for each batch of bottom ash, treated fly ash and
APC residues to be disposed of at WENT Landfill at the initial stage of the IWMF
operation (i.e. for a period of 6 months). If the test results confirm that heavy metals or
pH are not of concern, the TCLP test can be deleted or reduced to half-yearly intervals.

6b.4.1.54 The estimated amount of refuse would be about 185 tpd. Most of the refuse will be
diverted to the incinerators of the IWMF for combustion. Only a small amount of
undersize, non-combustible inert refuse (about 23 tpd), which contains glass, sand, etc.,
will be disposed of at the WENT Landfill.

Table 6b.8 Summary of Waste Generation from Operation of the IWMF
Waste Product Quantity Disposal Route
Incineration by-products
Bottom Ash
660 tpd
Comply with proposed Incineration Residue
Pollution Control Limits prior to disposal to
WENT landfill
Fly ash and APC Residue
120 tpd
(240 tpd after
cementation)
MT by-products
Refuse from MT
Pre-treatment would be applied (e.g. cement
solidification) for compliance with proposed
Incineration Residue Pollution Control Limits
prior to disposal to WENT landfill.
162 tpd
Refuse (e.g. badly contaminated textiles, wood
and residual paper, plastics etc.) to be diverted
to the incinerators of the IWMF for combustion.
23 tpd
Undersized, non-combustible inert refuse (e.g.
glass, sand, residual metals etc.) to be disposed
at WENT landfill.

Table 6b.10 Materials used in the IWMF Operation with Land Contamination
Potential
Material
Expected Annual
Consumption / Production
Estimated Quantity to be
Stored On-site
Chemicals Consumption
Slaked lime 12,065 tonnes 496 tonnes
Ammonia water (25%) 4,015 tonnes 165 tonnes
Activated carbon 383 tonnes 31 tonnes
Kerosene 283 m
3
Caustic soda 206 tonnes 8,466 kg
Hydrochloric acid 83 tonnes 3,411 kg
Sulfurous acid 3,906 kg 161 kg
Production of Incineration By-products
Bottom Ash 240,900 tonnes 3,300 m
Fly ash & APC residues 43,800 tonnes 600 m