CN107032517B - 改性珊瑚砂用于海岛地区工程用水净化的方法 - Google Patents
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Abstract
本发明涉及一种改性珊瑚砂用于海岛地区工程用水净化的方法,所述方法步骤如下:(1)预处理;(2)净化:步骤(1)预处理后的近海海水泵入过滤塔,所述过滤塔内装填有改性珊瑚砂填料,预处理过的近海海水经过滤塔内的填料吸附净化,充分去除杂质,获得海岛地区工程用净化水。本发明采用三种原料混合均匀形成均匀的分散体系,用于珊瑚砂的改性,浸润过程中,进入珊瑚砂的孔隙内,形成大孔(珊瑚砂)内套小孔(磁性有序介孔炭或磁性有序介孔铁酸镍)的立体孔隙结构,相对于天然珊瑚砂孔隙的无序性,改性后的珊瑚砂孔隙结构有序,大小孔错落有致,用于海水净化处理,吸附储存效果好,后续反冲洗时也便于杂质脱出。
Description
技术领域
本发明涉及一种改性珊瑚砂用于海岛地区工程用水净化的方法。
背景技术
目前,海水利用所用水源主要是近海岸海水,近岸海水中含有悬浮物、胶体和溶解物质,而且还有大量的有机物、微生物、细菌、藻类等污染物质,容易受到污染。因此,开展海水利用工程的首要步骤是海水净化。
在海水净化工艺中,过滤是其中的重要环节,是保证出水水质的关键工序。近年来,随着近岸海水污染的加剧,过滤过程中使用的石英砂、无烟煤等传统滤料,大多只有明显的除浊效果,由于其表面带负电、比表面积小、表面吸附容量低,对海水中的污染物,如氮、磷、有机物的去除显得力不从心,已无法满足海水利用对水质的要求,传统滤料面临严峻的考验。 目前,改性滤料在污水处理、给水处理和降水径流水质控制等领域取得进展,在制备机理、吸附机理等方面取得了一系列的成果,有益于其推广应用。但截止目前,改性剂主要是铁系、铝系、镁系、锰系的氧化物或水合氧化物,以及稀土类金属化合物,且均处于实验室研究阶段,对于在实际应用中存在的问题仍没有很好的解决。
珊瑚砂为珊瑚虫死后的产物,矿物成分则为文石或高镁方解石,堆积密度约900kg/m3,表观密度约1800 kg/m3。珊瑚砂中的孔隙包括颗粒间的外孔隙与颗粒本身的内孔隙,孔隙率接近50%。相对其他建筑材料而言,珊瑚砂质轻、多孔,在海岛上就地取材,将珊瑚砂进行改性制备滤料,用于海岛工程用水的的净化,净化效果好,滤料成本低。
发明内容
本发明的目的在于解决现有技术的不足,提供一种改性珊瑚砂用于海岛地区工程用水净化的方法。
改性珊瑚砂用于海岛地区工程用水净化的方法,
(1)预处理:将近海水引致蓄水池,加入所蓄海水总体积1-2.5%质量的水不溶性葡聚糖,充分搅拌均匀,于常温自然絮凝沉降6-8h;
大分子量的水不溶性葡聚糖,具有吸附和絮凝的功效(在近海海水污染物之间产生架桥功能,加速污染物沉降),同时,可以吸附重金属杂质和小分子难以絮凝的成分,絮凝预处理效果好,操作方便;
(2)净化:步骤(1)预处理后的近海海水泵入过滤塔,所述过滤塔内装填有改性珊瑚砂填料,预处理过的近海海水经过滤塔内的填料吸附净化,充分去除杂质,获得海岛地区工程用净化水;
所述改性珊瑚砂填料的加工方法如下:
(a)将珊瑚砂破碎,选取粒径范围0.6-0.8mm的珊瑚砂,用海水冲洗去可见杂质,晒干备用;
珊瑚砂中的孔隙包括颗粒间的外孔隙与颗粒本身的内孔隙,孔隙率接近50%。相对其他材料而言,珊瑚砂质轻、多孔,在海岛上就地取材,将珊瑚砂进行改性制备滤料,用于海岛工程用水的的净化,净化效果好,滤料成本低,本申请的发明人试验过程中发现,采用天然的珊瑚砂可以实现海水一定程度的净化,但由于珊瑚砂孔隙率极高且孔径较大,吸附杂质后储存杂质的功能弱,过滤过程中杂质极易再次进入海水,影响净化效果,因此,本申请的发明人对天然的珊瑚砂进行改性,以进一步提高吸附能力,同时大大改善储存杂质的能力;
(b)配置改性剂,将磁性有序介孔介质、硅藻土和有机膨润土混合均匀,加适量净化水搅拌均匀,用氢氧化钠调pH值至7.5-7.8,获得改性剂;
(c)将步骤(a)的珊瑚砂投入步骤(b)的改性剂中改性处理,于常温搅拌浸润4-6小时,浸润过程中补加氢氧化钠维持体系pH值7.5-7.8;
(d)步骤(c)改性处理后的珊瑚砂经沥干,于220-280℃高温焙烧0.5-1h后,冷却至常温,即作为填料装填过滤塔。
磁性有序介孔炭具有巨大的比表面积和丰富的三维孔隙结构,高比表面积有利于杂质的吸附储存,规整有序的开放性孔道、尺寸可调的孔径为反冲洗处理时杂质的脱出提供了路径;硅藻土具有孔隙度大、吸收性强、化学性质稳定的优点,有机膨润土具有良好的触变性、化学稳定性、分散性,加入适量有机膨润土搅拌均匀后,即可形成稳定的分散料;
将上述三种原料混合均匀形成均匀的分散体系,用于珊瑚砂的改性,浸润过程中,进入珊瑚砂的孔隙内,形成大孔(珊瑚砂)内套小孔(磁性有序介孔炭或磁性有序介孔铁酸镍)的立体孔隙结构,相对于天然珊瑚砂孔隙的无序性,改性后的珊瑚砂孔隙结构有序,大小孔错落有致,用于海水净化处理,吸附储存效果好,后续反冲洗时也便于杂质脱出。
优选的,改性剂中磁性有序介孔介质的质量分数为0.5-1.2%,硅藻土的质量分数为2-2.5%,有机膨润土的质量分数为0.8-1.6%。
优选的,改性剂中磁性有序介孔介质的质量分数为0.0%,硅藻土的质量分数为2.2%,有机膨润土的质量分数为1.0%。
优选的,所述磁性有序介孔介质为磁性有序介孔炭和/或磁性有序介孔铁酸镍。
优选的,所述磁性有序介孔介质为磁性有序介孔炭和磁性有序介孔铁酸镍按质量比2:1的混合物。
本发明的有益效果是:本发明采用三种原料混合均匀形成均匀的分散体系,用于珊瑚砂的改性,浸润过程中,进入珊瑚砂的孔隙内,形成大孔(珊瑚砂)内套小孔(磁性有序介孔炭或磁性有序介孔铁酸镍)的立体孔隙结构,相对于天然珊瑚砂孔隙的无序性,改性后的珊瑚砂孔隙结构有序,大小孔错落有致,用于海水净化处理,吸附储存效果好,后续反冲洗时也便于杂质脱出。
具体实施方式
下面通过具体实施例,对本发明的技术方案作进一步的具体说明。
实施例1:
改性珊瑚砂用于舟山某海岛工程用水净化的方法,该海岛近海水中有机物、微生物、细菌、藻类等污染物质含量高,取两组20ml近海海水用离心机离心,离心条件4500rpm,1min,离心完毕去除上清液,对残留固形物称重,平均固形物含量为1.8mg/20ml,
(1)预处理:将近海水引致蓄水池,加入所蓄海水总体积1%质量的水不溶性葡聚糖,充分搅拌均匀,于常温自然絮凝沉降8h;
再次取两组20ml预处理后的近海海水用离心机离心,离心条件4500rpm,1min,离心完毕去除上清液,对残留固形物称重,平均固形物含量为0.8mg/20ml,
(2)净化:步骤(1)预处理后的近海海水泵入过滤塔,所述过滤塔内装填有改性珊瑚砂填料,预处理过的近海海水经过滤塔内的填料吸附净化,充分去除杂质,获得海岛地区工程用净化水;
所述改性珊瑚砂填料的加工方法如下:
(a)将珊瑚砂破碎,选取粒径范围0.6mm的珊瑚砂,用海水冲洗去可见杂质,晒干备用;
(b)配置改性剂,将磁性有序介孔介质、硅藻土和有机膨润土混合均匀,加适量净化水搅拌均匀,用氢氧化钠调pH值至7.5,获得改性剂;
(c)将步骤(a)的珊瑚砂投入步骤(b)的改性剂中改性处理,于常温搅拌浸润6小时,浸润过程中补加氢氧化钠维持体系pH值7.5;
(d)步骤(c)改性处理后的珊瑚砂经沥干,于220℃高温焙烧1h后,冷却至常温,即作为填料装填过滤塔;
本实施例中,步骤(b)改性剂中磁性有序介孔介质的质量分数为0.5%,硅藻土的质量分数为2.5%,有机膨润土的质量分数为0.8%,所述磁性有序介孔介质为磁性有序介孔炭。
再次取两组20ml净化后的近海海水用离心机离心,离心条件4500rpm,1min,离心完毕去除上清液,对残留固形物称重,平均固形物含量为0.02mg/20ml,杂质基本除去彻底。
实施例2:
改性珊瑚砂用于海南某海岛工程用水净化的方法,该海岛近海水中有机物、微生物、细菌、藻类等污染物质含量高,取两组20ml近海海水用离心机离心,离心条件4500rpm,1min,离心完毕去除上清液,对残留固形物称重,平均固形物含量为2.8mg/20ml,
(1)预处理:将近海水引致蓄水池,加入所蓄海水总体积2.5%质量的水不溶性葡聚糖,充分搅拌均匀,于常温自然絮凝沉降6h;
再次取两组20ml预处理后的近海海水用离心机离心,离心条件4500rpm,1min,离心完毕去除上清液,对残留固形物称重,平均固形物含量为1.5mg/20ml,
(2)净化:步骤(1)预处理后的近海海水泵入过滤塔,所述过滤塔内装填有改性珊瑚砂填料,预处理过的近海海水经过滤塔内的填料吸附净化,充分去除杂质,获得海岛地区工程用净化水;
所述改性珊瑚砂填料的加工方法如下:
(a)将珊瑚砂破碎,选取粒径范围0.8mm的珊瑚砂,用海水冲洗去可见杂质,晒干备用;
(b)配置改性剂,将磁性有序介孔介质、硅藻土和有机膨润土混合均匀,加适量净化水搅拌均匀,用氢氧化钠调pH值至7.8,获得改性剂;
(c)将步骤(a)的珊瑚砂投入步骤(b)的改性剂中改性处理,于常温搅拌浸润4-6小时,浸润过程中补加氢氧化钠维持体系pH值7.8;
(d)步骤(c)改性处理后的珊瑚砂经沥干,于220℃高温焙烧0.5h后,冷却至常温,即作为填料装填过滤塔;
本实施例中,步骤(b)改性剂中磁性有序介孔介质的质量分数为1.2%,硅藻土的质量分数为2%,有机膨润土的质量分数为0.8%,所述磁性有序介孔介质为磁性有序介孔铁酸镍。
再次取两组20ml净化后的近海海水用离心机离心,离心条件4500rpm,1min,离心完毕去除上清液,对残留固形物称重,平均固形物含量为0.05mg/20ml,杂质基本除去彻底。
实施例3:
改性珊瑚砂用于青岛某海岛工程用水净化的方法,该海岛近海水中有机物、微生物、细菌、藻类等污染物质含量高,取两组20ml近海海水用离心机离心,离心条件4500rpm,1min,离心完毕去除上清液,对残留固形物称重,平均固形物含量为2.2mg/20ml,
(1)预处理:将近海水引致蓄水池,加入所蓄海水总体积1.8%质量的水不溶性葡聚糖,充分搅拌均匀,于常温自然絮凝沉降7h;
再次取两组20ml预处理后的近海海水用离心机离心,离心条件4500rpm,1min,离心完毕去除上清液,对残留固形物称重,平均固形物含量为1.0mg/20ml,
(2)净化:步骤(1)预处理后的近海海水泵入过滤塔,所述过滤塔内装填有改性珊瑚砂填料,预处理过的近海海水经过滤塔内的填料吸附净化,充分去除杂质,获得海岛地区工程用净化水;
所述改性珊瑚砂填料的加工方法如下:
(a)将珊瑚砂破碎,选取粒径范围0.7mm的珊瑚砂,用海水冲洗去可见杂质,晒干备用;
(b)配置改性剂,将磁性有序介孔介质、硅藻土和有机膨润土混合均匀,加适量净化水搅拌均匀,用氢氧化钠调pH值至7.6,获得改性剂;
(c)将步骤(a)的珊瑚砂投入步骤(b)的改性剂中改性处理,于常温搅拌浸润4-6小时,浸润过程中补加氢氧化钠维持体系pH值7.6;
(d)步骤(c)改性处理后的珊瑚砂经沥干,于250℃高温焙烧0.5h后,冷却至常温,即作为填料装填过滤塔;
本实施例中,步骤(b)改性剂中磁性有序介孔介质的质量分数为0.8%,硅藻土的质量分数为2.2%,有机膨润土的质量分数为1.0%,所述磁性有序介孔介质为磁性有序介孔炭和磁性有序介孔铁酸镍按质量比2:1的混合物。
再次取两组20ml净化后的近海海水用离心机离心,离心条件4500rpm,1min,离心完毕去除上清液,对残留固形物称重,平均固形物含量为0.032mg/20ml,杂质基本除去彻底。
对比例1:
基本操作通实施例1,不同之处是填料采用现有的石英砂;
取两组20ml净化后的近海海水用离心机离心,离心条件4500rpm,1min,离心完毕去除上清液,对残留固形物称重,平均固形物含量为0.2mg/20ml,杂质去除效果比实施例1差近9倍。
对比例2:
基本操作同实施例2,不同之处是填料采用天然的珊瑚砂。
取两组20ml净化后的近海海水用离心机离心,离心条件4500rpm,1min,离心完毕去除上清液,对残留固形物称重,平均固形物含量为0.8mg/20ml,杂质去除效果比实施例1差近15倍。
测定实施例1-3和对比例1-2净化后的近海海水中磷酸盐、TOC、氨氮、浊度的去除率,试验结果表明:
实施例1-3的平均去除率如下:磷酸盐 94.8%,TOC 97.2%,氨氮98.3%,浊度99.6%;
对比例1的平均去除率如下:磷酸盐 78.8%,TOC 87.2%,氨氮78.3%,浊度83.6%。
对比例1的平均去除率如下:磷酸盐 75.2%,TOC 82.2%,氨氮75.3%,浊度84.0%。
以上所述的实施例只是本发明的一种较佳的方案,并非对本发明作任何形式上的限制,在不超出权利要求所记载的技术方案的前提下还有其它的变体及改型。
Claims (5)
1.改性珊瑚砂用于海岛地区工程用水净化的方法,其特征在于:所述方法步骤如下:
(1)预处理:将近海水引至 蓄水池,加入所蓄海水总体积1-2.5%质量的水不溶性葡聚糖,充分搅拌均匀,于常温自然絮凝沉降6-8h;
(2)净化:步骤(1)预处理后的近海海水泵入过滤塔,所述过滤塔内装填有改性珊瑚砂填料,预处理过的近海海水经过滤塔内的填料吸附净化,充分去除杂质,获得海岛地区工程用净化水;
所述改性珊瑚砂填料的加工方法如下:
(a)将珊瑚砂破碎,选取粒径范围0.6-0.8mm的珊瑚砂,用海水冲洗去可见杂质,晒干备用;
(b)配制 改性剂,将磁性有序介孔介质、硅藻土和有机膨润土混合均匀,加适量净化水搅拌均匀,用氢氧化钠调pH值至7.5-7.8,获得改性剂;
(c)将步骤(a)的珊瑚砂投入步骤(b)的改性剂中改性处理,于常温搅拌浸润4-6小时,浸润过程中补加氢氧化钠维持体系pH值7.5-7.8;
(d)步骤(c)改性处理后的珊瑚砂经沥干,于220-280℃高温焙烧0.5-1h后,冷却至常温,即作为填料装填过滤塔。
2.根据权利要求1所述的改性珊瑚砂用于海岛地区工程用水净化的方法,其特征在于:改性剂中磁性有序介孔介质的质量分数为0.5-1.2%,硅藻土的质量分数为2-2.5%,有机膨润土的质量分数为0.8-1.6%。
3.根据权利要求2所述的改性珊瑚砂用于海岛地区工程用水净化的方法,其特征在于:改性剂中磁性有序介孔介质的质量分数为0.8%,硅藻土的质量分数为2.2%,有机膨润土的质量分数为1.0%。
4.根据权利要求2或3所述的改性珊瑚砂用于海岛地区工程用水净化的方法,其特征在于:所述磁性有序介孔介质为磁性有序介孔炭和/或磁性有序介孔铁酸镍。
5.根据权利要求4所述的改性珊瑚砂用于海岛地区工程用水净化的方法,其特征在于:所述磁性有序介孔介质为磁性有序介孔炭和磁性有序介孔铁酸镍按质量比2:1的混合物。
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