养猪场污水处理设备选型处理技术
养殖场已经在各地星罗棋布,并且还在不断增加,大型养殖场也在逐渐兴起。可见,规模化养殖模式代替持续千年的传统家庭养殖模式这一重大变革正在加速,而这一变革将给农村带来一系列好的和不好的变化,其中具有污染物和肥料双重身份的畜禽粪便,在分布上就发生了很大改变。处理得好,它就是肥料,而且消除了污染,处理不好,它就是污染源,而且浪费了宝贵的有机肥资源。现就污水宝常用的几种养殖场粪便处理方式及其特点作一简要介绍,供参考。
一:养猪场污水处理设备选型全贮存零排放法
1、工艺:
粪便、尿液、冲洗水-------贮存池------果园、田地(本家和附近)
2、特点:该法除存贮外未作任何处理,但不排放,全部作肥料利用。
二:水压式沼气池排放法
1、工艺:
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粪便、尿液、冲洗水-------水压式沼气池(30-100立方米容积)------料液排放,沉渣定期清掏作肥料。
2、特点:该法只是获取了部分沼气,降解处理十分有限,排放后污染严重,同时造成有机肥源的大量流失。
三:干稀分离厌氧好氧排放法
1、工艺:
粪便------收集存贮------就地或外运生产商品有机肥或无偿供给附近农户。
尿液、冲洗水-------厌氧消化处理系统(沼气用于供热)------好氧池------氧化塘------排放
2、特点:该法投资大、占地宽,且效果不理想。一是处理后仍难完全达标,排放仍有污染,二是造成了相当数量有机肥源的流失
四:养猪场污水处理设备选型干稀分离厌氧零排放法
1、工艺:
粪便------收集存贮------就地生产商品有机肥。
尿液、冲洗水-------厌氧消化处理系统(沼气用于供热和发电)------大容量贮液池------管道------相应面积的林地和农田
2、特点:该法投资适中、占地不大,效果理想,是一个养殖场粪便处理新工艺,是能源、环保、生态的有机结合。一是生产商品有机肥和沼气发电可以获得较好的经济效益,二是处理后的沼液中尚存大量的有机养分得到利用,三是实行零排放而避免了污染。
就以上四种养殖场粪便处理方式而言,第四种方式即“干稀分离厌氧零排放法”是最可行最值得推广的方式,它具有许多优点,且大、中、小型养殖场都可采用。沼液实行零排放是厌氧处理养殖场粪便污水的核心,厌氧处理可以得到优质能源沼气,而零排放则同时解决了污染问题和有机肥源流失的问题。尤其是有机肥肥源问题,随着养殖用户的增加,养殖粪便处理这一问题将会变得十分突出,应该引起我们的足够重视。
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