摘要
我国铝材产品表面处理企业众多,碱蚀工序排放的碱蚀清洗废水中铝(Al)含量达到2000—4000mg/L。将碱蚀清洗废水进行分质预处理,沉淀脱水后制成主要含水(H_(2)O)和氢氧化铝[Al(OH)_(3)]的铝泥,可以节约综合处理成本,铝泥可以用作其他工业生产的原材料,实现废水的资源化利用;二氧化碳(CO_(2))酸化法是利用工业副产品CO_(2)调节pH值处理碱蚀清洗废水,减少碳排放。按照废水处理量10t/d计算,CO_(2)酸化法制取的可再利用的结晶Al(OH)_(3)量约为78.6kg/d,CO_(2)利用量即排碳减量约为23.6kg/d,减少固体废物处置量约为439kg/d。
There are many surface treatment enterprises for aluminum products in China.The aluminum content in alkaline corrosion cleaning wastewater discharged from the alkali corrosion process can reach 2,000-4,000 mg/L.The alkaline corrosion cleaning wastewater is subjected to qualitative pretreatment;after precipitation dehydration,it can be made into aluminum sludge that mainly contains H_(2)O and Al(OH)_(3),thus saving the comprehensive treatment cost.The aluminum sludge can be used as raw materials for other industrial production,thus realizing the resource recycling of wastewater.The CO_(2)acidification method uses industrial by-product CO_(2)to adjust the pH value of alkaline corrosion cleaning wastewater,thus reducing carbon emissions.According to the calculations based on the wastewater treatment capacity of 10 tons/day,the amount of reusable crystalline Al(OH)_(3)obtained through CO_(2)acidification method is about 78.6 kg/day,the carbon emission reduction(utilization of CO_(2))is about 23.6kg/d,and the reduction of solid wastes that will require disposing is about 439kg/d.
作者
胡华清
高志杰
陈细妹
吴秋融
陈弘
许丹宇
HU Hua-qing;GAO Zhi-jie;CHEN Xi-mei;WU Qiu-rong;CHEN Hong;XU Dan-yu(Tianjin Gaojie Environmental Protection Technology Co.,Ltd.,Tianjin 300191;Water Pollution Control Committee,China Association of Environmental Protection Industry,Beijing 100037;Guangdong LANDTIE Environmental Protection Co.,Ltd.,Shantou Guangdong 515000;Tianjin Academy of Eco-Environmental Sciences,Tianjin 300191,China)
出处
《中国环保产业》
2022年第7期45-51,共7页
China Environmental Protection Industry
关键词
铝材碱蚀清洗废水
CO_(2)酸化法
结晶Al(OH)_(3)铝泥
资源化利用
CO_(2)利用
alkaline corrosion cleaning wastewater of aluminum products
CO_(2)acidification method
sludge containing crystalline Al(OH)_(3)
resource recycling
utilization of CO_(2)
