Trade Waste Research Articles

Tracing the origins of plastics in biosolids: The role of sewerage pipe materials and trade waste

Plastics are ubiquitous in virtually every environment on earth. While the specific sources of plastics entering wastewater are not well known, growing evidence suggests sewage sludge (biosolids) can be a sink for plastics. One potential source could be the sewerage pipe materials used to transport sewage between premises and wastewater treatment plants (WWTPs). To evaluate the significance of sewerage piping as a source of biosolids plastics concentrations, we compared the proportion of the total network (by length and surface area) of polyethylene (PE), polyvinylchloride (PVC), and polypropylene (PP) pipes from 10 WWTPs against their biosolids mass concentrations (mg plastic/g biosolid). Among the 10 catchments, the percentage of the network consisting of PP piping ranged from 0 to 1 %, with 0.8–21 % for PE, and 8–73 % for PVC. Biosolids plastics concentrations ranged from 0.09 to 8.62 mg/g (mg plastic/g biosolid) for PP and PE, respectively. For all three plastics, there was no significant Pearson correlation (r < 0.4) between the biosolids concentration (dry weight mg/g) and the proportion of the network material of the sewerage piping as plastic (either length or surface area). A comparison of trade waste entering a subset of 6 WWTP showed the highest biosolid principal components analysis (PCA) associations between loads of plastics (g/day) and automotive wash bays, general manufacturing, hospitals, laboratories, food manufacturing, laundry and dry cleaning, and cooling towers. A stepwise regression analysis indicated pipe length and surface area, as well as automotive wash bays and food manufacturing may be significant. While our data gave mixed results on the attribution of the sources of plastics entering WWTPs, it suggests that sewerage infrastructure and trade waste may play some role. Future studies should investigate the leachability of sewerage infrastructure and contributions from specific trade waste categories to determine their significance in plastics entering WWTPs.

SOSIALISASI PEDULI LINGKUNGAN TERHADAP PELESTARIAN KAWASAN WISATA MANGGROVE KUALA LANGSA

Kuala Langsa is a mangrove tourist area located in Langsa City, Aceh Province. Currently, the Kuala Langsa Mangrove Forest tour is a tourist spot that is of interest to the public. However, tourists and snack traders are not disciplined towards the behavior of protecting the environment. This community service (PKM) activity aimed to reduce the littering behavior or activities of the community. Partners in this PKM activity were snack traders and mangrove tourists. The implementation of this activity was carried out in three stages, namely: first stage, the team prepared permits from the village head; the second stage, the team prepared material requirements for carrying out activities such as leaflets or brochures, organic and non-organic waste bins, then carried out outreach and education to snack traders and tourists; and the third stage, namely the evaluation stage. The result of implementing this community service activity was the foster of sense of community concern for the preservation of mangrove forest tourism areas, namely by providing socialization and education. Changes in the behavior or activities of the hawker traders, it can be seen that the traders have collected the trade waste and disposed of it in a landfill.

Anaerobic Co-Digestion of Sewage Sludge and Trade Wastes: Beneficial and Inhibitory Effects of Individual Constituents

Anaerobic digestion (AD) of sewage sludge can be optimised by adding trade wastes (TWs) because of their nutrient content and boost in biogas formation if non-inhibitory. However, some components in TWs might have an inhibitory impact, such as nitrogen compounds, sulphate, heavy metals, metalloids, halogens and organic pollutants (e.g., phenol). This study aimed to understand the impact of TWs on the co-digestion with sewage sludge to identify appropriate TW loads for sustainable AD operation. The composition of 160 TWs was evaluated and the constituents with potential to cause inhibition or toxicity were tested in bio-methane potential (BMP) tests. The compounds studied in BMP tests included ammonia, zinc, copper, aluminium, mercury, arsenic, chloride, sulphate and nitrate. An improvement was observed at concentrations 2–746 mg Zn/L, 1066–2821 mg Cl/L as zinc sulphate and sodium chloride in biogas production, and 2–746 mg Zn/L, 162 mg SO4/L, 25 mg Hg/L as zinc sulphate, sodium chloride and mercury sulphate in methane production, respectively. Considering the TWs characterised and the results of the BMP tests, a volumetric ratio of 10/90 of TWs and sewage sludge is proposed as a suitable feedstock for co-digestion.

Analisis Teologi Lingkungan Seyyed Hossein Nasr Terhadap Krisis Air di Masyarakat Batujaya Karawang

Disposal of trade waste and household waste has negative impacts, such as land shifts, floods, air pollution, and other disasters. The same thing happened in Batujaya, precisely in the hamlet of South Bakung, where the river is the most practical place for disposing of waste. The purpose of this paper is to describe the research points: 1). How is the water crisis as a form of environmental damage in the people of Batujaya Karawang; 2). How does Seyyed Hossein Nasr's analysis of environmental theology view the water crisis as environmental damage. This research is a direct field research, using qualitative descriptive method, and Seyyed Hosein Nasr's theory of environmental theology as the analytical knife. The results of this study found that first, the people of Batujaya, especially the South Bakung community, were in danger of throwing garbage into the river. Second, the lack of anticipation from the government and the sanctions given to the people of Batujaya, especially in South Bakung, for the disposal of trade waste and household waste into the river. Third, make people in Batujaya, especially in South Bakung aware, not to throw garbage into the river anymore by means of physical and spiritual socialization.

Spatiotemporal trends and impact of Covid-19 lockdown on eight sewage contaminants in Brisbane, Australia, from 2012 to 2020

This study aims to investigate the spatiotemporal trends and impact of COVID-19 lockdowns to the profile of physiochemical parameters in the influent of wastewater treatment plants (WWTPs) around Brisbane, Australia. One 24-hr composite influent sample was collected from 10 WWTPs and analyzed for a range of physiochemical parameters per week (i.e., chemical oxygen demand (COD), total organic carbon (TOC), total nitrogen (TN), total phosphorus (TP), ammonia, volatile suspended solid (VSS)) and per month (i.e., Ni and Cr) from 2012 to 2020, including the period of COVID-19 lockdowns in the region. The catchments studied were urban, with a mix of domestic and industrial activities contributing towards the contaminant profile. Statistical analysis identified that industrial and commercial land use, as well as population size had a large impact to the parameter loads and profile. Per capita mass loads of Cr in one catchment were 100 times higher than in others from one industrial point source. TP demonstrated a potential monotonic decrease over time due to practical reduction policies that have been implemented for phosphorous content in household detergents, except for one catchment where trade waste from food manufacturing industries contributed to an overall increase of 6.9%/year TP. The COVID-19 lockdown (March–April 2020) posed different impact on different catchments, either decrease (7–61%) or increase (2–40%) of most parameter loads (e.g., COD, TOC, TN, TP, VSS, Ammonia), which was likely driven by catchment characteristics (i.e., the proportion of residential, commercial, and industrial land uses). This study enhances our understanding of spatiotemporal trend of contaminants in the catchments for further effective source control.

Does aquatic products trade waste or save water resources? An analysis of virtual water trade

Abstract China is the largest producer and exporter of aquatic products. While earning foreign exchange, its implied water resources output could not be denied. Against the background of promoting water resources and food security, whether aquatic products trade can also achieve the purpose of water-saving has become a topic worthy of attention. Based on the idea of the quality and energy conservation law, this study uses the physical value input–output table and the fish growth model, and calculates the output and input of China's aquatic products virtual water trade indirectly by fishery water coefficient and virtual water of feed crops. The results show that while China's aquatic products trade is water-saving in general, it is water-wasting in some parts, and its environmental function needs to be improved. In particular, the aquatic products trade with South Asia, Central Asia, Northern Europe, North America, South America and Oceania is virtual water net import, while that with other regions is virtual water net export. The trade of shellfish and marine fish is water-saving, while that of mollusk, crustacean and freshwater fish is water-wasting. China, as a globally responsible power, should try to dynamically optimize the trade structure of aquatic products.

Evolution of structural properties and its determinants of global waste paper trade network based on temporal exponential random graph models

As an important recyclable and reusable resource, waste paper is traded in millions of dollars around the world every year. Global waste paper trade not only addresses resource scarcity issues, alleviates environmental pressures and brings substantial economic gains, but also contributes to the development of global circular economy. Using complex network methods, bilateral waste paper trade data, and temporal exponential random graph models (TERGM), we construct global waste paper trade networks (GWPTNs) during 2000–2018, and examine their structural evolution and determinants. We report that: (I) GWPTNs display obvious features of small-world network, low reciprocity, heterogeneity and disassortativity; (II) Asia is the leading recipient of global waste paper, while Europe and North America are the main exporters; (III) China and India dominate the waste paper import markets while the United States is the largest exporter, and Germany plays an essential role in both importing and exporting hubs of waste paper; (IV) The evolution of the GWPTNs is significantly influenced by endogenous reciprocity, transitivity and preferential attachment, and economies with more partners or within the same continents are more likely to trade waste paper. Economies with higher urbanization rates, more per capita income, stricter environmental regulation, or lower industrialization rates are more likely to export waste paper; conversely, they are more likely to be the importers. Economy-pairs sharing a language or religion, being a former colony of the same colonizer, historical colonial relationship or a border, or signing regional trade agreements are more likely to trade waste paper.

Selection of Industrial Trade Waste Resource Recovery Technologies—A Systematic Review

Industrial wastewater and other trade wastes are often sources of pollution which can cause environmental damage. However, resource recovery approaches have the potential to lead to positive environmental outcomes, profits, and new sources of finite commodities. Information on these waste sources, and the valuable components which may be contained in such waste is increasingly being made available by public, academic and commercial stakeholders (including companies active in meat processing, dairy, brewing, textile and other sectors). Utilising academic and industry literature, this review evaluates several methods of resource recovery (e.g., bioreactors, membrane technologies, and traditional chemical processes) and their advantages and disadvantages in a trade waste setting. This review lays the groundwork for classification of waste and resource recovery technologies, in order to inform process choices, which may lead to wider commercial application of these technologies. Although each waste source and recovery process is unique, membrane bioreactors show promise for a wide range of resource recovery applications. Despite interest, uptake of resource recovery technologies remains low, or not widely championed. For this to change, knowledge needs to increase in several key areas including: availabilities and classification of trade wastes, technology choice processes, and industrial viability.

Co-processing of industrial trade rejects in cement plant.

In India non-hazardous industrial waste is generated at a staggering rate of about 30 million metric tonnes/year; considering the major generators (excluding power plant and mining industry waste) as per Ministry of Housing and Urban Affairs, Government of India (GoI), thus disposing of them is a challenge. The industrial waste generated from fast-moving consumer goods (FMCG) trade rejects and expired product is also enormous (although largely remains unaccounted) and needs to be disposed of by the producer as per the guidelines of the Ministry of Environment, Forests and Climate Change, GoI. Co-processing of this industrial trade rejects in cement plant can be a prominent solution as it reduces the disposal problem of the solid waste stream and provides an alternative methodology for complete thermal and material recovery of the waste with no by-products. Co-processing further reduces the use of conventional resources by utilizing the waste as an alternative fuel and raw materials. The study thus analyzes a co-processing trial of a month in a cement plant in the southern part of India and based on the obtained data, the environmental and operational sustainability was studied. The economic benefit obtainable was also analyzed based on the achieved substitution benefit. Parameters such as emission and quality of the final product were gauged. The leaching behavior of the final product was also analyzed. Thus, the findings will help in reducing the carbon footprints of the industrial wastes, specifically the FMCG trade waste, and will show the sustainability of co-processing waste in Indian cement plants.

A comparative study of biological activated carbon based treatments on two different types of municipal reverse osmosis concentrates

A study was conducted to understand the impact of reverse osmosis concentrate (ROC) characteristics on the efficacy of biological activated carbon (BAC) based treatments for removing organics and nutrients from two ROC streams (ROCa derived from municipal waste input with high salinity, and ROCb derived from domestic waste plus industrial trade waste with markedly lower salinity). Fluorescence excitation and emission matrix spectra and molecular weight analysis demonstrated that ROCa and ROCb had a significantly different composition of organic compounds due to the petrochemical processing and abattoir waste compounds in ROCb. Although the sequence of coagulation, UV/H2O2 and BAC gave the highest organic removal from the two ROCs (67% DOC for ROCa and 62% for ROCb), UV/H2O2 followed by BAC achieved satisfactory removal (>55%) for both ROC types. Sequential treatment involving coagulation gave better phosphorus removal (>90%) than any single treatment (<65%). Total nitrogen (TN) removal was fairly low (<50%) for all the treatment options and the salinity level had insignificant impact on nitrogen removal. Analysis of bacterial communities suggested that higher phosphorus removal and lower total nitrogen and nitrate removal from ROCb than ROCa was related to the presence of various denitrifying or phosphorus accumulating bacteria in the BAC.

An investigation into per- and polyfluoroalkyl substances (PFAS) in nineteen Australian wastewater treatment plants (WWTPs)

Quantifying the emissions of per- and polyfluoroalkyl substances (PFAS) from Australian wastewater treatment plants (WWTP) is of high importance due to potential impacts on receiving aquatic ecosystems. The new Australian PFAS National Environmental Management Plan recommends 0.23 ng L−1 of PFOS as the guideline value for 99% species protection for aquatic systems. In this study, 21 PFAS from four classes were measured in WWTP solid and aqueous samples from 19 Australian WWTPs. The mean ∑21PFAS was 110 ng L−1 (median: 80 ng L−1; range: 9.3–520 ng L−1) in aqueous samples and 34 ng g−1 dw (median: 12 ng g−1 dw; range: 2.0–130 ng g−1 dw) in WWTP solids. Similar to WWTPs worldwide, perfluorocarboxylic acids were generally higher in effluent, compared to influent. Partitioning to solids within WWTPs increased with increasing fluoroalkyl chain length from 0.05 to 1.22 log units. Many PFAS were highly correlated, and PCA analysis showed strong associations between two groups: odd chained PFCAs, PFHxA and PFSAs; and 6:2 FTS with daily inflow volume and the proportion of trade waste accepted by WWTPs (as % of typical dry inflow). The compounds PFPeA, PFHxA, PFHpA, PFOA, PFNA, and PFDA increased significantly between influent and final effluent. The compounds 6:2 FTS and 8:2 FTS were quantified and F–53B detected and reported in Australian WWTP matrices. The compound 6:2 FTS was an important contributor to PFAS emissions in the studied Australian WWTPs, supporting the need for future research on its sources (including precursor degradation), environmental fate and impact in Australian aquatic environments receiving WWTP effluent.

A review of salty waste stream management in the Australian dairy industry

Saline wastewater is a by-product of cheese manufacturing and whey processing that can have serious environmental and economic consequences. Salty streams originating from dairy processing operations include chromatography wastes, clean-in-place wastewater, acid whey, salty whey and waste generated from whey demineralization processes such as nanofiltration, electrodialysis and ion exchange. With the participation of the major dairy companies in Australia, an industry wide survey was conducted to acquire a comprehensive understanding of the management strategies for these salty waste streams. High salinity waste streams are commonly directed to evaporation ponds. However, environmental impacts from land degradation, odour and dust have prevented the construction of further evaporation ponds in some areas of Australia. The survey results also show that disposal to municipal trade waste is not always effective, as the current levels of some salinity-related parameters are significantly higher than the levels allowed by the local water/environmental authorities. For high salinity streams, salt removal can lead to more substantial savings in trade waste charges compared to wastewater volume reduction. Thus, salt removal and recovery from salty waste streams has become a major focus of the sustainability agenda of the Australian dairy industry.

Heavy Metal Removal From The Wastewater By Using Low Cost Adsorbent

Heavy metal toxicity because of industrial waste has been a threat to the environment for the past several decades, particularly within the developing countries like India, China and Kingdom of Thailand wherever price effectiveness of the removal method may be a major factor. This industrialization has not only brought development and prosperity however eventually disturbed the system. One of the impacts is visible; in kind of pollution. Within the gift study heavy metal contamination of water bodies has been mentioned. Effluents from sizable amount of industries viz., electroplating, leather, tannery, textile, pigment & dyes, paint, wood process, crude purification, photographic material production etc., contains vital measure of heavy metals in their waste. The traditional strategies of treatment of heavy metal contamination includes chemical precipitation, chemical reaction, natural action, membrane separation, reverse osmosis, electro chemical analysis etc. These strategies square measure expensive, energy intensive and sometimes related to generation of hepatotoxicity byproducts. Thus, the adsorption has been investigated as a price effective technique of removal of serious metals from waste. In the present study numerous low cost adsorbent has been reviewed as an abatement of serious metal pollution from lignin, iron (III) hydroxide and red mud, low husks, feather palm waste, tea plant waste, sugar beet pulp, battery trade waste, ocean nodule residue and grape stalk wastes are explored for their practicableness to get rid of hepatotoxic heavy metals from contaminated water. These adsorbent includes materials of natural origin like zeolites, clay, sphagnum moss and polysaccharide square measure found to be an efficient agent for removal of toxic serious metals like lead, Cd, Zn, Cu, Ni, Hg, Cr etc. aside from these numerous agricultural wastes like rice husk, neem bark, black gram, waste tea-coffee, walnut shell, coconut coir, coconut husk, bagasse etc. were also established as a potent adsorbent for heavy metal removal. Beside that low cost industrial by product like ash, blast furnace sludge, waste slurry.

Performance of Field Based Activated Carbon Systems for Odour Control

Abstract Community tolerance for odours from sewer infrastructure is lessening, providing pressure to wastewater utilities to target and treat odour emissions from sewer networks. Gas phase odour abatement systems within sewer networks typically target hydrogen sulfide (H2S) as an odorant and overall odour indicator. However other compounds can occur naturally, or be present from trade waste, that are either odorous themselves or may impact on the performance of odorant removal in odour abatement systems. Activated carbon (AC) systems adsorb most contaminants during their lifetime until most active sites are depleted. Samples from the inlet and outlet of 6 AC filters in Sydney and Melbourne (Australia) were taken monthly over 18 months and analysed for volatile sulfurous compounds (VSCs) using gas chromatography (GC) coupled with a sulfur chemiluminescence detection (SCD). H2S was measured by Jerome 631-X hydrogen sulfide analyser for each sample. Each sample returned approximately 14 VSCs. After screening the data for wet weather and cooler periods, 6 VSCs were studied further. This paper evaluates and compares the performance of 6 activated carbon filters for each compound identified and each appropriate grouping of compounds. H2S and methyl mercaptan were found to be removed well, yet dimethyl disulfide was found to have a negative removal more often than it had a positive removal. Dimethyl sulfide and dimethyl trisulfide also suffered from negative removals, yet not as often as dimethyl disulfide. Carbon disulfide was removed as often as it was released.

Prioritisation of odorants emitted from sewers using odour activity values

Volatile sulfur and volatile organic compound (VSC and VOC, respectively) emissions were measured over a 3.5 year period from 21 field monitoring sites across Australia to determine their potential contribution to sewer odours and support the evaluation of odour abatement processes used to treat sewer emissions. Measured VOC concentrations were generally less than 250 μg/m3, although some VOCs (toluene, trimethylbenzene and cymene) were present at higher concentrations. In general, sewer headspace VOCs are unlikely to be a significant contributor to sewer odours and VOC monitoring is only recommended for sites with a history of significant trade waste discharges or where odour character descriptors are typical of VOCs. A range of VSCs were identified, including hydrogen sulfide, ethyl mercaptan, methyl mercaptan, dimethyl sulfide, dimethyl disulfide, dimethyl trisulfide, carbon disulfide, and carbonyl sulfide. From a concentration perspective, the VSCs were dominated by hydrogen sulfide, followed by methyl mercaptan, and then a range of sulfides. Significant variations in VSC concentration and relative importance were observed between the cities and all identified VSCs were potentially odorous. An odorant prioritisation methodology to identify key and high priority odorants was developed and successfully demonstrated. While some high priority VOCs were identified, VSCs (hydrogen sulfide, methyl mercaptan, dimethyl sulfide, and dimethyl disulfide) were the dominant priority odorants. A wider range of VSCs should be assessed in addition to hydrogen sulfide to improve the evaluation of odour abatement processes.

Ubiquity of activated sludge ferricyanide-mediated BOD methods: A comparison of sludge seeds across wastewater treatment plants

Many studies have described alternatives to the BOD5 standard method, with substantial decreases in incubation time observed. However, most of these have not maintained the features that make the BOD5 assay so relevant – a high level of substrate bio-oxidation and use of wastewater treatment plant (WWTP) sludge as the biocatalyst. Two recently described ferricyanide-mediated (FM)-BOD assays, one for trade wastes and one for WWTP influents and treated effluents, satisfy these criteria and were investigated further here for their suitability for use with diverse biocatalysts. Both FM-BOD assays responded proportionately to increasing substrate concentration with sludges from 11 different WWTPs and temporally (months to years) using sludges from a single WWTP, confirming the broad applicability of both assays. Sludges from four WWTPs were selected as biocatalysts for each FM-BOD assay to compare FM-BOD equivalent values with BOD5 (three different sludge seeds) measurements for 12 real wastewater samples (six per assay). Strong and significant relationships were established for both FM-BOD assays. This study has demonstrated that sludge sourced from many WWTPs may be used as the biocatalyst in either FM-BOD assay, as it is in the BOD5 assay. The industry potential of these findings is substantial given the widespread use of the BOD5 assay, the dramatically decreased incubation period (3–6h) and the superior analytical range of both assays compared to the standard BOD5 assay.

Organic and nutrient reduction in a fish processing facility – A case study

Fish processing plant consumes relatively large quantity of water and generates equally large volumes of wastewater with high organic and nutrient strength that must be pre-treated prior to sewer discharge. As the trade waste regulations are becoming more stringent now days, it is important that this high strength wastewater should be treated through better water management strategy. This requires huge investments for effluent treatment plants in order to meet the required specification for the trade waste discharge. A major squid and scallops processing plant is presented as a case study to highlight the interrelated issues of the resultant deterioration in water quality and the economic consequences of this impact. The main objective of this study is to develop a wastewater management plan for this processing plant that would address key issues required to meet trade waste limits. The characteristics of wastewater streams generated from various sources have been analysed and have the potential of being reused within the fish processing plant have also been identified. The results of the analysis of various key water quality parameters provided a basis for the selection and identification of feasible options for wastewater treatment, reuse and recycling.

A laboratory assessment of the impact of brewery wastewater discharge on sulfide and methane production in a sewer

The impact of brewery wastewater discharge on sulfide and methane production in a sewer was assessed. Experiments were carried out on laboratory scale sewer reactors consisting of both an experimental and a control reactor. The control reactor was intermittently fed with real fresh sewage while the experimental reactor was fed with a mixture of brewery and domestic wastewater at two different proportions (10 and 25% v/v). 10% v/v discharge of brewery wastewater increased the H2S and CH4 production rates in the sewer reactor by 40% and 30%, respectively. When the brewery wastewater fraction was increased to 25% v/v, the H2S production rate of the experimental reactor decreased to the level of the control reactor. In contrast, the CH4 production rate maintained at a level that was 30% higher than that in the control reactor. These results indicate that the discharge of brewery wastewater into sewers can give negative impacts in relation to odour and corrosion management of the systems and will increase the greenhouse gas emissions from sewers. The study also reveals that the impact of trade waste on the biological reactions in sewers is complex, and requires careful experimental assessment in each case.

Forecasting the Hebei Province Model of Foreign Trade of the Eco-Environment Based on GA-BP Neural Network

Along with our country foreign trade considerable development and international competitiveness increasing enhancement, the environment question is prominent actually day by day. The paper selected the data of the foreign trade and industrial waste discharge from 1998 to 2009 to establish the Hebei Province prediction model. It shows that GA-BP neural network had higher accuracy, tolerant and excellent generalization ability about ecology environment. It provides a guidance to forecast foreign trade environment.

Managing trade waste: what should best practice look like?

Consideration of best practice in trade-waste management is timely, given the challenges that the water industry and its customers face in managing the triple bottom line so we can maximise sustainability of both our environment and business. City West Water (CWW) is one of Australia’s largest providers of trade-waste disposal services. These services, and the associated trade-waste programmes we operate, are critical to managing the risks associated with trade waste, as well as facilitating the uptake of cleaner production and waste minimisation across industrial and commercial sectors. Providers of trade-waste services have direct contact with many waste generators. This is a unique platform for risk management and facilitation of cleaner production and waste minimisation. Consequently, trade-waste services and programmes are critical to the outworking of Government policies and commitments in relation to cleaner production, waste minimisation and sustainability, as well as to meeting the community’s expectations in relation to waste management. However, it is not these issues alone that should drive consideration of trade-waste management. We must consider these issues alongside the viability of economic development and employment and look for solutions that maximise the beneficial outcomes across all three dimensions of the triple bottom line. This paper takes a look at the current trade-waste management environment, along with the existing legislative and policy frameworks. It then suggests what best practice trade-waste management should entail. It examines key issues and drivers, elements of an effective strategy, roles and responsibilities, resource requirements, challenges/obstacles and solutions, and performance measurement and how it should be communicated.