CN108109712A - 水葫芦生物质采铀系统 - Google Patents
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Abstract
本发明公开了一种水葫芦生物质采铀系统。水葫芦生物质采铀系统,包括高压抽水泵,缓存池,搅拌吸附池,过滤装置,滤液池,沼气池,沼气发电机组,烘干室,高温焚烧炉。所述高压抽水泵一侧连接铀尾矿库,另一侧与缓存池连接;缓存池与搅拌吸附池连接,搅拌吸附池另一侧连接有过滤装置,过滤装置一侧与滤液池连接;过滤装置另一侧与沼气池连接;沼气池一侧连接有沼气发电机组;沼气池的另一侧连接有烘干室,烘干室连接有高温焚烧炉。本发明具有操作简便,成本低廉等优点。
Description
技术领域
本发明属于尾矿库废水处理技术领域,尤其涉及一种铀尾矿库中铀尾矿液的处理系统,即水葫芦生物质采铀系统。本专利申请请求申请号为2017103377111、名称为“一种水葫芦干粉吸附剂及吸附铀与后处理工艺”的专利申请的优先权。
背景技术
江西省721尾矿坝作为亚洲最大的铀尾矿坝,其尾矿液铀浓度约为2ug/ml,储量高达500万立方米,存在巨大安全隐患。如2008山西临汾市发生的尾矿溃坝重大责任事故,造成258人死亡,34人受伤,带来巨大损失。同时铀尾矿液可以通过渗透进入地下水,污染水质,甚至通过食物链传递进入人体,诱发一系列疾病。因此,如何有效地处理铀尾矿库中尾矿液,并且回收铀已成为环保领域一个突出问题。传统的化学沉淀法,电解法,膜分离技术成本大,技术要求高,对低浓度铀的提取效果不明显。而生物质吸附法不同,生物质吸附剂孔径率高,比表面积大,其表面含有多种活性基团,铀离子可以通过与其表面的自由活性基团络合而被吸附。水葫芦作为一种有效的净化水体的植物,其繁殖和生长速度快,适应能力强,在我国南方泛滥成灾。若将其打捞回收制成生物质,用以治理铀尾矿液,可以达到以废治废的效果。同时,水葫芦碳氮比接近15:1,是适宜的厌氧发酵底物,产甲烷率高。因此用水葫芦生物质吸附铀再进行厌氧发酵产沼气,得到的残余物再进行铀的提取是一种铀尾矿液处理的有效途径。
发明内容
为解决上述一系列问题,本发明提供一种铀尾矿库中铀尾矿液处理系统——水葫芦生物质采铀系统,技术方案如下:
一种水葫芦生物质采铀系统,包括高压抽水泵,缓存池,搅拌吸附池,过滤装置,滤液池,沼气池,沼气发电机组,烘干室,高温焚烧炉;所述高压抽水泵一侧连接铀尾矿库,另一侧与缓存池连接;缓存池与搅拌吸附池连接, 搅拌吸附池另一侧连接有过滤装置,过滤装置一侧与滤液池连接;过滤装置另一侧与沼气池连接;沼气池一侧连接有沼气发电机组;沼气池的另一侧连接有烘干室,烘干室连接有高温焚烧炉。
滤液池还与缓存池连接,缓存池、搅拌吸附池、过滤装置和滤液池之间形成一个回路。
水葫芦生物质采铀系统内工艺流程如下:
(1)铀尾矿库内的尾矿液通过高压抽水泵抽入缓存池内;
(2)将尾矿液流入搅拌吸附池内,将制备的水葫芦生物质粉末经过管道进入搅拌吸附池内;
(3)经过一段时间的吸附后,将搅拌吸附池中含有水葫芦生物质粉末的悬浮液经过滤装置过滤后,滤渣导入贮气发酵一体化沼气池;
(4)水葫芦生物质粉末悬浮液经过滤后所得的滤液导入滤液池,再用泵抽回缓存池以便后续吸附工序;
(5)过滤后所得的水葫芦生物质在沼气池中经过反应产生沼气,发电机组利用沼气发电;
(6)发酵残余物导入烘干室烘干后,再利用高温焚烧炉对其进行高温焚烧处理,留下的灰分即是含铀生物矿石。
本发明的有益效果为:通过高压抽水泵将铀尾矿液抽入缓存池,再将缓存池中铀尾矿液通入搅拌吸附池,调节PH=3后加入水葫芦生物质搅拌吸附180min,使水体中的铀被生物质吸附,吸附一定时间后,通入过滤装置过滤,滤液进入滤液池,若滤液达标,可用于森林灌溉;若未达标,则再次通入缓存池进行多次吸附处理。滤渣进入沼气池发酵,发酵残余物进入烘干室烘干,之后放入高温焚烧炉焚烧成含铀生物矿石。
附图说明
图1是本发明系统流程简图。
附图标记:高压抽水泵1,缓存池2, 搅拌吸附池3, 过滤装置4, 滤液池5, 沼气池6,沼气发电机组7, 烘干室8, 高温焚烧炉9。
具体实施方式
工艺流程如下:
(1)铀尾矿库内的尾矿液先通过高压抽水泵1(300m3/h)抽入缓存池2(1000m3);
(2)再通过管道流入搅拌吸附池3(800m3),同时制备的水葫芦生物质粉末(粉碎过200目筛)经管道进入搅拌吸附池3内;
(3)经过一段时间的吸附后,将搅拌吸附池3中含有水葫芦生物质粉末的悬浮液经过滤装置4过滤后,滤渣通过管道导入沼气池6(1300m3);
(4)水葫芦生物质粉末的悬浮液过滤后所得的滤液导入滤液池5(800m3),用泵抽回缓存池2以便后续在搅拌吸附池内进行多次吸附;
(5)过滤后的水葫芦生物质在沼气池6中经过反应,产生的沼气经发电机组7发电;
(6)发酵残余物导入烘干室8烘干后,再利用高温焚烧炉9对其进行高温焚烧处理,留下的灰分即是含铀生物矿石;
(7)回收所得的含铀生物矿石。
工程经济效益计算:
1. 本工程日处理铀尾矿液约50m3,铀含量为5*10-6g/ml,日获得U3O8量33kg。年产U3O8量12吨,作为铀资源回收,价值可观,回收利润达10.8亿人民币。
2. 日产沼气1500m3,每日发电2250kwh,年处理尾矿18250m3,年产沼气547500m3,年发电821250kwh,按0.5元/kwh计算,获利41万元。
沼气发电成本:9.84万元,
沼气发电总收益:31.16万元。
Claims (3)
1.一种水葫芦生物质采铀系统,其特征在于:包括高压抽水泵(1),缓存池(2),搅拌吸附池(3),过滤装置(4),滤液池(5),沼气池(6),沼气发电机组(7),烘干室(8),高温焚烧炉(9);所述高压抽水泵(1)一侧连接铀尾矿库,另一侧与缓存池(2)连接;缓存池(2)与搅拌吸附池(3)连接, 搅拌吸附池(3)另一侧连接有过滤装置(4),过滤装置(4)一侧与滤液池(5)连接;过滤装置(4)另一侧与沼气池(6)连接;沼气池(6)一侧连接有沼气发电机组(7);沼气池(6)的另一侧连接有烘干室(8),烘干室(8)连接有高温焚烧炉(9)。
2.根据权利要求1所述的一种水葫芦生物质采铀系统,其特征在于:所述滤液池(5)还与缓存池(2)连接,缓存池(2)、搅拌吸附池(3)、过滤装置(4)和滤液池(5)之间形成一个回路。
3.根据权利要求2所述的一种水葫芦生物质采铀系统,其特征在于,系统内工艺流程如下:
(1)铀尾矿库内的尾矿液通过高压抽水泵(1)抽入缓存池(2)内;
(2)将尾矿液流入搅拌吸附池(3)内,将制备的水葫芦生物质粉末经过管道进入搅拌吸附池(3)内;
(3)经过一段时间的吸附后,将搅拌吸附池(3)中含有水葫芦生物质粉末的悬浮液经过滤装置(4)过滤后,滤渣导入贮气发酵一体化沼气池(6);
(4)水葫芦生物质粉末悬浮液经过滤后所得的滤液导入滤液池(5),再用泵抽回缓存池(2)以便后续吸附工序;
(5)过滤后所得的水葫芦生物质在沼气池(6)中经过反应产生沼气,发电机组(7)利用沼气发电;
(6)发酵残余物导入烘干室(8)烘干后,再利用高温焚烧炉(9)对其进行高温焚烧处理,留下的灰分即是含铀生物矿石。
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