Innovative Farmers Bypass Landfill in Favour of Food Recycling in Hong Kong
Analyses have shown that landfill is an outcome of “tragedy of the commons” and is itself an example of unsustainable landscape design that impacts society and environment. In order to meet growing waste management needs, city planners in some areas propose expansion of landfill areas. But is there an alternative to landfills that makes good use of regenerative resources, such as food waste? Too Many Landfills: a Hong Kong Perspective Landfill areas, particularly the waste that is decomposing therein, emit the greenhouse gases CO2 and methane. Waste can also leak harmful materials that can leach into groundwater supply and landfill drainage systems. Beyond this, engineers estimate it takes at least 30 years to fully restore a landfill area and waste decomposition time is an issue: foam cups, aluminium cans and glass bottles take 50, 80-200 and 1 million years respectively to decompose. In Hong Kong, a city with over 7.1 million occupants, the government operates 16 landfills, which occupy 600 hectares of land; in fact, the landfill dependency has accelerated in the post-industrial society. According to a government report, 3,584 tonnes of food waste is generated from domestic and commercial kitchens per day. In order to cope with the capacity shortfall of three existing landfills, the government launched a proposal to expand current landfills areas by an additional 283 hectares. The Financial Committee of Legislative Council approved the first installment of landfill expansion in 2015 by an amount that would go beyond the total area of active arable land, which is 685 hectares in 2015. Black Soldier Flies Can Make a Difference in Food Cycles According to Food Wastage Footprint: Impacts on Natural Resources published by the Food and Agriculture Organization of the United Nations in 2013, food waste is the third biggest source of greenhouse gases after the United States and China, when the energy that goes into the entire lifecycle (including production and disposal) of that wasted food is taken into consideration. To turn problem into solution, innovative farmers or gardeners can recycle “waste” into fish food! E-Farm is an organic farm in the New Territories, the northern part of Hong Kong called Fanling. The farm first started a trial scheme to collect food waste from neighbouring school students’ lunches and converted this into high protein fish meal and organic fertilisers for crops. More than 10 tonnes of food waste were collected within six months in 2016. Mr. To Yat-man is the farm owner who had the innovative idea to utilise food waste to feed Black Solider Flies (BSF), insects that are native to Hong Kong. The BSF is an omnivore species and their larvae is a “hungry litter eater” that converts vegetables, meat and even bones into organic matter and microorganism-rich amendments for soil within 30 hours, and at the same time reduces the weight and size of organic matter, such as food waste. Becoming a Larvae Farmer Breeding BSF larvae has become popular in organic agriculture and permaculture gardening design in other countries, such as Australia. People set up BSF farms in their backyard to fasten food cycles and composting rates and sustainably manage organic waste management. It takes approximately two days; after the eggs hatch, larvae is developed and, after 20 days, is ready to be harvested to reach maturation stage, before being used as fish food for species such as Tilapia and Jade Perch. This biotechnology can generate both social and environmental benefits. First, it improves the immune system of fish, and shortens the fishing rearing period. Second, it also brings positive flow-on effects such as reducing food carbon miles, money spent on buying imported organic fertilisers and it helps to promote sustainable land use through building up organic matter in soil by recycling household waste! Land is a non-renewable asset. Researchers have proven that one centimetre of soil takes at least 1,000 years (FAO, 2014) to form in a long and complex process. BSF larvae can be harnessed to help counter the growing threat of global warming. We, as farmers or backyard gardeners, can actually play a role in helping the environment by reusing so-called ‘organic waste’ and setting up small larvae farms in our city corners; how exciting it is to see an appropriate technology that turns a pressing issue into a more sustainable future for our living soil! Authors: Ranae So and Louisa Wong. Ranae So worked as a project manager at E-Farm from April 2015 to March 2016. The original article was published by Reset.org on Dec 16 2016.
我與專業人士趁元宵佳節到屯門兆麟苑考察。社區園圃出現在居屋的場景，可算是突破，它不但美化屋苑的環境和拉近鄰里關係，更有趣的是得到業主立案法團支持和250戶的響應。街坊也認同廚餘是一種資源，而不是坊間所標籤的垃圾。除了堆填區，它應有更好的處理辦法。 綠領行動在半年內跟居民合作，成功收集10噸廚餘，製作堆肥，並開墾了1000呎的農地，招募32戶屋苑農民耕種，甚至吸引附近幼稚園的學生到屋苑學習耕種，開了兩小塊的農田。 綠領行動又會把剩餘的廚餘供應給本地農場，希望建立一個低碳和講求資源循環的廚餘回收方案。這項壯舉已深深感動了我與建築，測量，規劃及園境界的專業人士，令大家主動關心規劃標準，探討能否在規劃屋苑時，預留堆肥區和社區園圃的空間，履行綠色公民責任，救救地球，把廚餘轉化為可再生的資源。
Hello 我係O2豆腐渣貓砂嘅Pirry。聽聞近日有些組員喺度討論我哋隻貓砂用作有機堆肥。首先我自己並不是一位農友，亦唔係好熟悉有機耕種。所以喺度提供一啲資料，咁大家自行判斷。 我哋嘅豆腐渣係從元朗新佛香豆品廠收回。佢哋全部用係非基因改造黃豆。我哋嘅豆腐渣貓砂有超過九成都係用豆腐渣造。但係我哋亦都有加其他配料，例如粟米粉即鷹粟粉，我相信佢哋未必係non GMO。所以嘅貓砂有超過九成嘅用了係非基因改造源料，但係亦都有幾％係唔清楚。農友可以自行判斷。 關於貓嘅排泄物是否可以用作堆肥，阿成講到貓係雜食，比較易傳播病菌。呢個都合理。或者我建議唔好用糞便去堆肥, 淨係用團結左嘅豆腐渣砂。咁樣做風險應該會低好多。 有其他問題可以留言比我地。 可以到我哋Facebook : WoodLab Facebook 得閑可以去我哋網頁睇下 woodlab.hk 其他資料會陸續綠活地圖發佈。
有時用化學洗潔精，也難以應付非常油膩的碗碟，多洗幾次仍「油立立」，吼！ 所以我試試較天然的去油法，頗有效呢！ 1.茶包 沖泡完的茶包，我不捨得丟，就帶回家曬乾備用。每次洗碗先用茶包擦擦鍋子，再用其他清潔劑清洗一次便可～ 打完邊爐的鍋很油！ 用茶包擦擦～ 之後過水，去了大部份油~ 2.茶籽粉 3. 果皮 較少碗碟的，可直接灑上少許茶籽粉，加點水，擦一擦後過水，即可去油。 而果皮用法與茶包一樣，蕉皮、橙皮也可～一個橙的橙皮，夠幾次用每次食橙也留下橙皮吧～ 茶籽粉[ ] 蕉皮捽捽pan 再灑上少少茶籽粉 就洗乾淨pan了~ 多碗碟的話，可先開一盤茶籽粉水作洗碗用，再過水，即可洗淨～ 「食德好」的做法是，開一盤茶籽水和兩盤清水～ 洗完茶籽粉水過兩次水都OK 架喇~ 原文刊於食光光