{"id":36565,"date":"2019-10-08T09:31:00","date_gmt":"2019-10-08T09:31:00","guid":{"rendered":""},"modified":"2020-06-20T19:18:47","modified_gmt":"2020-06-20T19:18:47","slug":"11565-could-china-s-cement-industry-be-fuelled-with-household-waste","status":"publish","type":"post","link":"https:\/\/dialogue.earth\/en\/pollution\/11565-could-china-s-cement-industry-be-fuelled-with-household-waste\/","title":{"rendered":"Could China\u2019s cement industry be fuelled with household waste?"},"content":{"rendered":"<p>If the cement industry were a country, it would be the fourth largest CO<sub>2<\/sub> emitter, <a href=\"https:\/\/www.iea.org\/newsroom\/news\/2018\/april\/cement-technology-roadmap-plots-path-to-cutting-co2-emissions-24-by-2050.html\" target=\"_blank\" rel=\"noopener noreferrer\">accounting<\/a> for 7% of global emissions \u2013 about the <a href=\"https:\/\/edgar.jrc.ec.europa.eu\/overview.php?v=CO2andGHG1970-2016&amp;sort=des8\" target=\"_blank\" rel=\"noopener noreferrer\">same share<\/a> as India.<\/p>\n<p>China produces the majority of the world\u2019s\u00a0cement, a powdery substance that is mixed with sand, gravel\u00a0and water to make concrete. In the period 2011-2013, <a href=\"https:\/\/www.gatesnotes.com\/About-Bill-Gates\/Concrete-in-China\" target=\"_blank\" rel=\"noopener noreferrer\">China produced<\/a> more cement than the US in the entire 20<sup>th<\/sup> century.<\/p>\n<p>The Chinese cement industry has already made improvements in energy efficiency. In 2017, it <a href=\"https:\/\/www.earth-syst-sci-data.net\/10\/2213\/2018\/essd-10-2213-2018.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">accounted<\/a> for 57% of the global industry\u2019s output but only 52% of its emissions. However, emissions reductions from energy efficiency measures are <a href=\"https:\/\/www.chathamhouse.org\/sites\/default\/files\/publications\/2018-06-13-making-concrete-change-cement-lehne-preston-final.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">tiny<\/a> compared to those that could be achieved with innovative technologies\u00a0such as carbon capture and storage (CCS), which sequesters\u00a0emissions.<\/p>\n<p>\u201cLooking longer term, either we need to have <a href=\"https:\/\/www.chinadialogue.net\/article\/show\/single\/en\/11379-Can-the-global-cement-industry-cut-its-carbon-emissions-\">carbon capture and storage for the cement industry<\/a>, or we need to be looking at alternative materials,\u201d said Madeleine Rawlins of the engineering consultancy Mott MacDonald, in an interview with China Dialogue earlier this year.<\/p>\n<p>Unfortunately, most CCS technologies are still at an <a href=\"https:\/\/www.chathamhouse.org\/sites\/default\/files\/publications\/2018-06-13-making-concrete-change-cement-lehne-preston-final.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">early stage<\/a> of development. And with global cement production <a href=\"https:\/\/awsassets.panda.org\/downloads\/englishsummary__lr_pdf.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">estimated to increase<\/a> from four billion tons today to almost five billion in 2030, other methods to reduce emissions are urgently needed.<\/p>\n<p><a href=\"https:\/\/www.statista.com\/chart\/14595\/china-makes-more-cement-than-the-rest-of-the-world\/\" target=\"_blank\" rel=\"noopener noreferrer\"><img decoding=\"async\" style=\"width: 100%; height: 100%;\" src=\"https:\/\/chinadialogue-production.s3.amazonaws.com\/uploads\/content_image\/content_image\/5794\/china_makes_more_cement_than_the_rest_of_the_world_n.jpg\" alt=\"China Makes More Cement Than The Rest Of The World\" \/><\/a><\/p>\n<h2>The problem with cement<\/h2>\n<p>Fundamentally, the problem with reducing emissions from the cement industry is the chemistry itself. To produce clinker \u2013 the key ingredient in cement \u2013 you need lime (CaO). The most common way of getting it is through a process known as calcination, in which limestone (CaCO<sub>3<\/sub>) is heated to around 1400C in a cement kiln breaking it down into lime. This releases a large amount of CO<sub>2<\/sub>\u00a0and accounts for <a href=\"https:\/\/www.chathamhouse.org\/sites\/default\/files\/publications\/2018-06-13-making-concrete-change-cement-lehne-preston-final.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">around 50% of the total emissions<\/a> from cement production.<\/p>\n<p>One way to reduce emissions from calcination is to reduce the proportion of clinker in cement by substituting it with other materials, but these <a href=\"https:\/\/www.carbonbrief.org\/qa-why-cement-emissions-matter-for-climate-change\" target=\"_blank\" rel=\"noopener noreferrer\">\u201cnovel cements\u201d<\/a> have not yet achieved large-scale commercial use.<\/p>\n<p>About 40% of emissions have traditionally come from burning fossil fuels to heat kilns (with the final 5-10% accounted for by operations and transport). This means there is significant scope to reduce overall cement emissions by finding alternative fuels. In Europe, <a href=\"https:\/\/www.chathamhouse.org\/sites\/default\/files\/publications\/2018-06-13-making-concrete-change-cement-lehne-preston-final.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">the use<\/a> of natural gas, biomass\u00a0and waste-derived fuels in cement-making has increased to about 43%, but in China the proportion is still only around 8%.<\/p>\n<p>The type of alternative fuel used is important, as was seen recently when the EU labelled the use of palm oil in biofuels <a href=\"https:\/\/www.climatechangenews.com\/2019\/02\/04\/eu-set-tighten-rules-palm-oil-biofuels\/\" target=\"_blank\" rel=\"noopener noreferrer\">unsustainable<\/a> due to deforestation concerns. In this context, burning waste sounds like a great option. Instead of it ending up in landfill, emitting methane and potentially <a href=\"https:\/\/dialogue.earth\/2889-podcast-burning-waste-chinas-solution-to-ocean-plastics\/\">reaching the ocean<\/a>, waste becomes a valuable resource to reduce cement industry emissions.<\/p>\n<p><img decoding=\"async\" style=\"width: 100%; height: 100%;\" src=\"https:\/\/chinadialogue-production.s3.amazonaws.com\/uploads\/content_image\/content_image\/5799\/RA1DDA_cement_plant__Shengwei_Group_in_Tongchuan_City__northwest_China_s_Shaanxi_Province_web.jpg\" alt=\"a cement plant of the Shengwei Group in Tongchuan City, northwest China's Shaanxi Province\" \/><br \/>\n<span class=\"caption\">A cement plant\u00a0in\u00a0Shaanxi\u00a0province, 2018 (Image: Alamy)<\/span><\/p>\n<h2>Waste-to-energy<\/h2>\n<p>Producing one ton of cement emits a staggering one ton of CO<sub>2<\/sub>. To heat a cement kiln with waste requires about three times as much waste as coal, and can reduce emissions by around 10%, according to engineering company FLSmidth.<\/p>\n<p>This is not revolutionary, but when combined with better waste management, the benefits of using waste in cement production are not negligible either.<\/p>\n<p>Given that China\u2019s municipal solid waste is <a href=\"https:\/\/e360.yale.edu\/features\/as-china-pushes-waste-to-energy-incinerators-protests-are-mounting\" target=\"_blank\" rel=\"noopener noreferrer\">set to grow<\/a> at a rate of 8-10% each year, increasing the amount of waste used in cement-making\u00a0should be of interest to Chinese policymakers. According to Jennifer Turner from the Wilson Center\u2019s China Environment Forum, waste is the new front in China\u2019s \u201cwar on pollution\u201d, putting pressure on cities to improve waste management systems.<\/p>\n<p>\u201cChina is seeking solutions to its municipal waste problem, so I think it\u2019s quite likely that at some point as they\u2019re reforming, more of China\u2019s waste incineration could go to the cement sector,\u201d says Turner.<\/p>\n<p>The largest cement producers in China have already started developing \u201cco-processing\u201d technologies that\u00a0bring coal\u00a0alternatives into the production fuel mix. <a href=\"https:\/\/www.cemfuels.com\/news\/item\/3088-china-resources-cement-launches-four-co-processing-projects-in-2018\" target=\"_blank\" rel=\"noopener noreferrer\">China Resources Cement (CRC)<\/a> operates several such projects in the south of China, and China Conch Ventures has signed agreements with both <a href=\"https:\/\/www.cemfuels.com\/news\/item\/3089-cnbm-strikes-solid-waste-joint-deal-with-conch-ventures\" target=\"_blank\" rel=\"noopener noreferrer\">China National Building Material<\/a> and <a href=\"https:\/\/www.cemfuels.com\/news\/item\/3114-china-shanshui-cement-starts-cooperation-agreement-with-china-conch-ventures-on-coprocessing\" target=\"_blank\" rel=\"noopener noreferrer\">China Shanshui Cement<\/a> to develop technologies that allow\u00a0solid waste to be used.<\/p>\n<p>However, many of these projects focus on\u00a0industrial rather than municipal waste. Household waste has a <a href=\"https:\/\/ietd.iipnetwork.org\/content\/use-alternative-fuels\" target=\"_blank\" rel=\"noopener noreferrer\">higher moisture content<\/a> and consequently does not burn as well as dry waste such as plastics. Given that wet and dry wastes are often mixed together in Chinese cities, the combustion potential of the latter cannot be fully exploited. Hence, waste-to-energy in the Chinese cement industry would benefit from cities improving their\u00a0waste-management practices.<\/p>\n<h2>Managing household waste<\/h2>\n<p>Despite China\u2019s waste-management issues, some companies have taken on the challenge and developed co-processing technology that can manage a higher moisture content.<\/p>\n<p>According to Gao Changming, one of the key designers of the <a href=\"https:\/\/www.flsmidth.com\/en-gb\/discover\/cement-2017\/can-the-chinese-cement-industry-help-contribute-to-waste-management\" target=\"_blank\" rel=\"noopener noreferrer\">latest co-processing technology<\/a> to handle household waste in the Chinese cement industry, China currently has 120 cement kilns for co-processing. Of these, only 53 are able to co-process household waste, and they are currently handling 5.2 million tons per year \u2013 only about 2.5% of China\u2019s total municipal solid waste.<\/p>\n<p>Asked whether current government policy is encouraging cement producers to adopt co-processing technologies, Gao emphasises the importance of waste-management systems such as the one <a href=\"https:\/\/www.chinadialogue.net\/article\/show\/single\/en\/11349-Shanghai-s-compulsory-waste-sorting-begins\">introduced in Shanghai<\/a> in July.<\/p>\n<p>\u201cImproved waste-management systems can reduce the costs associated with the pre-treatment of household waste for use in cement kilns. So if waste management were to be further developed it would greatly benefit cement plants using co-processing technologies,\u201d says Gao.<\/p>\n<p>Whether trying to deal with household waste or reduce emissions from the cement industry, the most effective way to mitigate damage to the environment and health will always be to \u201creduce\u201d rather than \u201creuse\u201d. In this case, to reduce our production of waste and concrete.<\/p>\n<p>In the meantime, the development of co-processing technologies in the cement industry could help China reduce its dependence on coal while dealing with its mountain of waste.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>As global cement production continues to grow, new technology allows China to improve waste management while reducing emissions<\/p>\n","protected":false},"author":3519,"featured_media":60589,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[760],"tags":[515,20000325],"hashtags":[],"country":[20000110],"class_list":["post-36565","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-pollution","tag-circular-economy","tag-industry","country-china"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.0 (Yoast SEO 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