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梁滩河水体富营养化 水葫芦大量生长 沙坪坝已着手实施三项工程治理八大污染源

2017-09-07 08:21:56   中国青年网

既然已进行了清理,为何多处河道内仍有大片水葫芦?

“水葫芦生长太快了,往往是费时一天清理出一片水域,一晚上又长满了。”王挺告诉记者,不仅如此,水葫芦因为适应性极强,清理后的残枝败叶随河水漂流,在水流较缓处就能继续生长并迅速繁殖。正是因为这些原因,最开始只在虎溪街道段发现的水葫芦,现在反而在梁滩河沙坪坝区段内随处可见。

记者查阅相关资料发现,成片生长的水葫芦不仅会阻断河道,影响航运和泄洪,是农业、水利、环保的“头号敌人”,而且会限制水体流动,使水体中的溶氧量减少、发臭,抑制浮游生物生长,甚至会导致鱼类大量死亡。

制定“一河一策”方案

实施三项工程全面治理河道

难道就没办法从根源上解决水葫芦带来的危害吗?

“首先要以最快的速度对河道各处的水葫芦进行清理和拦截,防止对下游造成影响。要从根源上解决水葫芦大面积爆发的危害,就必须彻底改善梁滩河水质和生态环境。”何怡介绍,全长88公里的梁滩河流经九龙坡、沙坪坝、北碚三个区,是主城区流域面积最大、污染类型最多、治理难度最大的次级河流。

近年来,沙坪坝区虽然不断强化对梁滩河的治理,但在梁滩河沙坪坝区段仍然存在着场镇污水、畜禽养殖及屠宰污染、水产养殖污染、农业种植污染、沿河生活垃圾和建筑垃圾污染、企业排污、竹木垮塌和水域漂浮物、农业种植侵占河道等八大污染源。

正是在这些污染源的共同作用下,梁滩河中总磷和氨氮含量居高不下,导致水体富营养化,成了水葫芦大量繁殖的温床。

目前,沙坪坝区农委河长办已经针对梁滩河的污染问题,提出了治理梁滩河及其支流的“一河一策”方案,以实施污水管网、污水处理厂及河道治理三项工程为重点,全面实施流域工业企业、沿岸场镇、建筑工地、畜禽养殖等影响水体的生产生活废水、工业固体废弃物、生活垃圾等污染整治,同时将开展河道清淤疏浚等工作。力争在2020年前,梁滩河城区段污水处理设施和管网建设得到基本完善,沿岸镇街和村社卫生环保、生态优美,梁滩河水质整体达到Ⅴ类水质,并将梁滩河流域建设成集防洪、绿化、休闲、旅游等多种功能于一体的水清岸绿、环境优美、风景秀丽、景色宜人的河岸线和休闲带。

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