title: Pilot scale pyrolysis - determination of critical moisture content for sustainable organic waste pyrolysis

authors: Sichone, Kavwa

abstract: Economic feasibility of large scale organic waste pyrolysis was investigated for Inghams Enterprise (Waitoa) chicken dissolved air flotation sludge (DAF) and activated sludge (biosolids) from the Hamilton municipal waste water treatment plant. Processing data was obtained from pilot plant trials using the Lakeland Steel (Rotorua) continuous auger pyrolysis plant using feedstock at 15, 30, 45 and ~80% moisture contents. Economics were calculated based on estimated capital and operating costs of a large scale facility, revenue from selling char, savings from landfill diversion (including transportation and gate costs), energy savings by recycling syngas product and using waste heat for drying feedstock.
For DAF, 15% moisture content gave yields of 21% syngas, 27% char, and 52% oil (dry weight basis). 15% moisture content gave the best processing conditions based on handling properties and degree of autogenesis. The DAF case does not give a payback period due to low scale of operations.
For biosolids, 15% moisture content feedstock gave yields of 46% syngas, 31% char, and 21% oil (wet weight). Difficulties were found with plant blockages at 45% and 80% moisture contents. 15% moisture content gave the best processing conditions and the best economic performance with a payback time of 4.6 years for a facility that could process 11,000 tonnes per year.

text: Pilot scale pyrolysis - determination of critical moisture content for sustainable organic waste pyrolysis Economic feasibility of large scale organic waste pyrolysis was investigated for Inghams Enterprise (Waitoa) chicken dissolved air flotation sludge (DAF) and activated sludge (biosolids) from the Hamilton municipal waste water treatment plant. Processing data was obtained from pilot plant trials using the Lakeland Steel (Rotorua) continuous auger pyrolysis plant using feedstock at 15, 30, 45 and ~80% moisture contents. Economics were calculated based on estimated capital and operating costs of a large scale facility, revenue from selling char, savings from landfill diversion (including transportation and gate costs), energy savings by recycling syngas product and using waste heat for drying feedstock.
For DAF, 15% moisture content gave yields of 21% syngas, 27% char, and 52% oil (dry weight basis). 15% moisture content gave the best processing conditions based on handling properties and degree of autogenesis. The DAF case does not give a payback period due to low scale of operations.
For biosolids, 15% moisture content feedstock gave yields of 46% syngas, 31% char, and 21% oil (wet weight). Difficulties were found with plant blockages at 45% and 80% moisture contents. 15% moisture content gave the best processing conditions and the best economic performance with a payback time of 4.6 years for a facility that could process 11,000 tonnes per year.

year: 2012

title: Statistical representations of the housing problem in briefings to incoming ministers, 2008–2020: The politics of housing numbers

authors: Barrett, Patrick

abstract: An interpretive policy studies perspective on what is understood to be the ‘facts’ about the housing problem in New Zealand has potential to uncover the way statistical representations of problems are embedded in larger normative narratives, and the consequential implications for housing policy and governance. This paper analyses such representations as they are evident in policy briefings to incoming Ministers of Housing between 2008 and 2020 by Housing New Zealand (HNZ) and its successor Kāinga Ora, and the way these reflect and reinforce a neoliberal political rationality and an agenda to residualise and marketise state housing support. The briefings represent authoritative accounts by a key bureaucratic advisory agency of the significant issues and priorities in the housing portfolio. The period prior to 2017 saw the emergence of new articulations of housing problems relating to affordability, declining rates of home ownership, an increasing rental population, and increasing homelessness. In the briefings to ministers, these problems were routinely framed as issues of supply and demand and market adjustment, and this has continued following the change of government in 2017. The focus of the paper is on identifying statistical representations within the discursive context that give weight to particular policy choices.

text: Statistical representations of the housing problem in briefings to incoming ministers, 2008–2020: The politics of housing numbers An interpretive policy studies perspective on what is understood to be the ‘facts’ about the housing problem in New Zealand has potential to uncover the way statistical representations of problems are embedded in larger normative narratives, and the consequential implications for housing policy and governance. This paper analyses such representations as they are evident in policy briefings to incoming Ministers of Housing between 2008 and 2020 by Housing New Zealand (HNZ) and its successor Kāinga Ora, and the way these reflect and reinforce a neoliberal political rationality and an agenda to residualise and marketise state housing support. The briefings represent authoritative accounts by a key bureaucratic advisory agency of the significant issues and priorities in the housing portfolio. The period prior to 2017 saw the emergence of new articulations of housing problems relating to affordability, declining rates of home ownership, an increasing rental population, and increasing homelessness. In the briefings to ministers, these problems were routinely framed as issues of supply and demand and market adjustment, and this has continued following the change of government in 2017. The focus of the paper is on identifying statistical representations within the discursive context that give weight to particular policy choices.

year: 2021

title: Ngā mahi: Kaupapa Māori outcomes and indicators kete

authors: Jefferies, Richard

subjects: New Zealand

abstract: As part of the Planning Under Cooperative Mandates research (PUCM) we developed a kaupapa Māori outcomes and indicators framework. This framework reflects tikanga Māori and Māori values. It also considers issues (including environmental issues) according to those tikanga that particular issues invoke. For example, tikanga brought into play in relation to council treatment and disposal of sewerage include tapu (sacred), and might also impact on the mauri (life-force) of water if treated effluent were to enter waterways.

The intention of our research has been to clarify and define key Māori environmental concepts so that stakeholders (including council staff) will have a terms of reference against which they can compare desired environmental outcomes from different perspectives and be better placed to integrate Māori environmental outcomes into planning processes. The end-point is this Nga Mahi kete report containing tikanga-based worksheets and the guidelines for using them.

text: Ngā mahi: Kaupapa Māori outcomes and indicators kete As part of the Planning Under Cooperative Mandates research (PUCM) we developed a kaupapa Māori outcomes and indicators framework. This framework reflects tikanga Māori and Māori values. It also considers issues (including environmental issues) according to those tikanga that particular issues invoke. For example, tikanga brought into play in relation to council treatment and disposal of sewerage include tapu (sacred), and might also impact on the mauri (life-force) of water if treated effluent were to enter waterways.

The intention of our research has been to clarify and define key Māori environmental concepts so that stakeholders (including council staff) will have a terms of reference against which they can compare desired environmental outcomes from different perspectives and be better placed to integrate Māori environmental outcomes into planning processes. The end-point is this Nga Mahi kete report containing tikanga-based worksheets and the guidelines for using them.

year: 2009-06-30