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集約化規(guī)模養(yǎng)豬場高濃度污水處理 生豬養(yǎng)殖規(guī)模化、無害化、綠色化發(fā)展
2019-08-01
09:25:32
來源:北京市農(nóng)機(jī)試驗(yàn)鑒定推廣站 閱讀量:16902
評論
導(dǎo)讀:隨著我國經(jīng)濟(jì)的發(fā)展、人民生活水平的提高,畜禽產(chǎn)品消費(fèi)數(shù)量逐年上升,肉類、禽蛋和牛奶的消費(fèi)量以平均每年近10%的速度增長,畜禽產(chǎn)品的需求越來越大。近年來養(yǎng)殖業(yè)快速發(fā)展,同時(shí)也帶來了嚴(yán)重的污染。
【農(nóng)機(jī)網(wǎng) 熱點(diǎn)關(guān)注】隨著我國經(jīng)濟(jì)的發(fā)展、人民生活水平的提高,畜禽產(chǎn)品消費(fèi)數(shù)量逐年上升,肉類、禽蛋和牛奶的消費(fèi)量以平均每年近10%的速度增長,畜禽產(chǎn)品的需求越來越大。近年來養(yǎng)殖業(yè)快速發(fā)展,同時(shí)也帶來了嚴(yán)重的污染。據(jù)統(tǒng)計(jì),農(nóng)村環(huán)境污染的70%來自畜禽養(yǎng)殖廢水污染,有的污染已經(jīng)深入到了地下水40m以下,特別是保護(hù)不到位、沒有糞污處理意識(shí)的地區(qū),因?yàn)轲B(yǎng)殖糞污導(dǎo)致了河流變黑,環(huán)境變惡劣,嚴(yán)重影響到了人們的生活,養(yǎng)殖業(yè)也不能持續(xù)健康發(fā)展。隨著北京市農(nóng)業(yè)結(jié)構(gòu)調(diào)整和轉(zhuǎn)型,限養(yǎng)區(qū)、禁養(yǎng)區(qū)的劃定,如何在有限的資源條件下,做好養(yǎng)殖場糞污治理工作成為首要任務(wù),這也是生豬養(yǎng)殖向規(guī)?;o害化、綠色化方向轉(zhuǎn)型發(fā)展的必然趨勢。
一、集約化規(guī)模養(yǎng)豬場高濃度污水處理現(xiàn)狀
20世紀(jì)80年代后期,我國畜禽養(yǎng)殖業(yè)得到了迅速發(fā)展,養(yǎng)殖規(guī)模、養(yǎng)殖方式和分布區(qū)域發(fā)生了巨大的變化。畜禽養(yǎng)殖方式由初的散養(yǎng)逐漸轉(zhuǎn)變?yōu)榧s型、規(guī)?;B(yǎng)殖。近年來,規(guī)模化畜禽養(yǎng)殖業(yè)的環(huán)境污染問題日益突出。由于城市近郊無足夠的土地消納大量的畜禽糞便,加之監(jiān)管不力,出現(xiàn)了畜禽糞便、污水隨意丟棄、排放的現(xiàn)象,成為城鎮(zhèn)周邊地帶和人口稠密地區(qū)環(huán)境的主要污染源,給大中城市帶來了巨大的環(huán)境壓力。
畜禽養(yǎng)殖業(yè)廢棄物主要由病死動(dòng)物尸體、固體糞便、尿水、沖圈水等組成。而糞便、尿水、沖圈水混合在一起形成大量高濃度、高氨氮、高懸浮物、處理難度較大的畜禽糞水,成為污染水體的重要污染源。據(jù)部門統(tǒng)計(jì),我國每年產(chǎn)生畜禽糞污38億噸,綜合利用率不到60%,糞污治理問題越發(fā)緊迫。北京市畜牧業(yè)發(fā)展迅速,2014年全市生豬存欄量180萬頭、年出欄量305萬頭,養(yǎng)殖業(yè)廢棄物中固體廢棄物收集利用,無害化處理利用率較高,而污水無害化處理率相對較低。
糞便排泄物及污水中含有大量的氮、磷等有機(jī)物,懸浮物和微生物致病菌。污染物數(shù)量大而且集中,并且污水和固體糞便經(jīng)常混雜在一起,給集中治理帶來了較大難度。據(jù)調(diào)查,全國90%以上的規(guī)?;B(yǎng)殖場沒有經(jīng)過環(huán)境影響評價(jià),80%的畜禽養(yǎng)殖場沒有污水治理(處置)和綜合利用設(shè)施,大量畜禽糞便污水未經(jīng)處理就地排放或間接排入水體,造成了嚴(yán)重的環(huán)境污染。據(jù)估計(jì),目前畜禽糞便中氮、磷的流失量約為化肥流失量的122%和132%。
畜禽養(yǎng)殖場特別是大規(guī)模養(yǎng)豬場廢水處理難度很大,一是由于大多數(shù)豬場都是采用漏縫板式的欄舍,水沖式清糞,排水量大;二是沖洗欄舍的時(shí)間相對集中,沖擊負(fù)荷很大;三是糞便和污水量大且集中,而農(nóng)業(yè)生產(chǎn)是季節(jié)性的,周圍農(nóng)田無法全部消納;四是廢水固液混雜,有機(jī)質(zhì)濃度較高,而且粘稠度很大。據(jù)相關(guān)數(shù)據(jù)表明:年出欄1萬頭育肥豬的豬場,每天產(chǎn)生的污水量為100噸;而飼養(yǎng)量為1000頭的奶牛場,年產(chǎn)鮮糞尿1.1萬噸;1個(gè)20萬只的蛋雞場,僅成年雞每日就要產(chǎn)生雞糞近50噸,如果加上相應(yīng)的后備雞,則全場雞糞日產(chǎn)量可達(dá)近70噸。這些畜禽養(yǎng)殖場產(chǎn)生的污水排放到附近水溝,不同程度地污染了水體、空氣和土壤,而富含大量有機(jī)物和氮、磷營養(yǎng)元素的污水,流入河流和湖泊,造成水體富營養(yǎng)化;滲入地下,使地下水中硝態(tài)氮、硬度和細(xì)菌總數(shù)超標(biāo)。五是污水處理工藝復(fù)雜,涉及到糞污收集、格柵分離、固液分離、氣浮分離、水解酸化、厭氧發(fā)酵、好氧發(fā)酵、消毒等工藝。六是機(jī)械裝備數(shù)量多,涉及污水提升泵、污泥提升泵、污泥回流泵等泵200多臺(tái)。七是污水厭氧發(fā)酵過程污泥馴化工藝難以掌握。污泥馴化需要根據(jù)水質(zhì)來調(diào)節(jié)污水注入總量,同時(shí)還與溫度、pH值、營養(yǎng)物質(zhì)、菌劑種類等參數(shù)有關(guān)。
二、集約化規(guī)模養(yǎng)豬場高濃度污水處理存在的問題
1.政策管理執(zhí)行難度較大?目前,盡管制定了《畜禽養(yǎng)殖污染防治管理辦法》、《畜禽養(yǎng)殖業(yè)污染物排放標(biāo)準(zhǔn)》等規(guī)定、標(biāo)準(zhǔn),但由于畜禽養(yǎng)殖業(yè)污染防治涉及農(nóng)業(yè)、畜牧、環(huán)保、衛(wèi)生等多個(gè)部門,行政主管部門之間存在職能交叉重復(fù),使監(jiān)督管理的力度減弱。同時(shí),由于規(guī)模化畜禽飼養(yǎng)場的建設(shè)是各地作為市政府“菜籃子”工程的重要組成部分,對于保障城市副食品供應(yīng)意義重大,不可簡單地實(shí)施“關(guān)、停、并、轉(zhuǎn)”,環(huán)保部門對其監(jiān)督管理相當(dāng)困難。因此,畜禽養(yǎng)殖業(yè)的污染防治與環(huán)境管理相當(dāng)薄弱,執(zhí)行難度較大。
2.污水治理投資少、缺乏實(shí)用的污水處理技術(shù)?從規(guī)?;菪箴B(yǎng)殖業(yè)糞尿治理投資情況來看,治理設(shè)施投資少,養(yǎng)殖企業(yè)環(huán)境保護(hù)意識(shí)薄弱,對投資興建治理設(shè)施的重要性和必要性缺乏認(rèn)識(shí)。同時(shí),由于缺乏各種實(shí)用、低成本、處理效果好的畜禽糞污處理技術(shù),尤其是治理污水的設(shè)施需要大量的資金投入,致使許多規(guī)模化養(yǎng)殖場治理設(shè)施不齊,污染問題未能得到有效解決。
3.農(nóng)牧脫節(jié),污水得不到充分利用?隨著規(guī)?;笄蒺B(yǎng)殖業(yè)的發(fā)展及畜禽養(yǎng)殖業(yè)向城市周邊的轉(zhuǎn)移,受畜禽糞便使用不方便、勞動(dòng)強(qiáng)度大、見效慢、產(chǎn)品價(jià)值不能體現(xiàn),加上目前種植業(yè)分戶經(jīng)營、勞動(dòng)力不足等因素的影響,使畜禽糞便在種植業(yè)上利用率低,造成了嚴(yán)重的農(nóng)牧脫節(jié),終導(dǎo)致了養(yǎng)殖業(yè)與種植業(yè)的分離,畜禽糞便這一寶貴的農(nóng)業(yè)資源得不到及時(shí)利用和消納。同時(shí),由于化肥生產(chǎn)的發(fā)展,種地者逐漸用化肥取代了畜禽糞肥,也使畜禽糞便失去了應(yīng)用價(jià)值。
三、集約化規(guī)模養(yǎng)豬場高濃度污水處理方法
污水處理基本方法有物理法、化學(xué)法、生物法,或幾種方法組合使用來去除污水中的有害物質(zhì),按照水質(zhì)狀況及處理后出水的去向確定其處理程度,污水處理一般可分為一級(jí)、二級(jí)和三級(jí)處理。一級(jí)處理采用物理處理法,即用格柵、篩網(wǎng)、沉沙池、沉淀池、隔油池等構(gòu)筑物,去除污水中的固體懸浮物、浮油,初步調(diào)整pH值,減輕污水的腐化程度。污水經(jīng)一級(jí)處理后,一般達(dá)不到排放標(biāo)準(zhǔn)(BOD去除率僅25%~40%)。故通常為預(yù)處理階段,以減輕后續(xù)處理工序的負(fù)荷和提高處理效果。二級(jí)處理是采用生物處理方法及某些化學(xué)方法來去除污水中的可降解有機(jī)物和部分膠體污染物。經(jīng)過二級(jí)處理后,污水中BOD的去除率可達(dá)80%~90%,即BOD含量可低于30mg/L。經(jīng)過二級(jí)處理后的污水,一般可達(dá)到農(nóng)灌標(biāo)準(zhǔn)和污水排放標(biāo)準(zhǔn),故二級(jí)處理是污水處理的主體。但經(jīng)過二級(jí)處理的污水中還存留一定量的懸浮物、生物不能分解的溶解性有機(jī)物、溶解性無機(jī)物和氮磷等藻類增值營養(yǎng)物,并含有病毒和細(xì)菌。因而不能滿足要求較高的排放標(biāo)準(zhǔn),如處理后排入流量較小、稀釋能力較差的河流就可能引起污染,也不能直接用作自來水、工業(yè)用水和地下水的補(bǔ)給水源。三級(jí)處理是進(jìn)一步去除二級(jí)處理未能去除的污染物,如磷、氮及生物難以降解的有機(jī)污染物、無機(jī)污染物、病原體等。污水的三級(jí)處理是在二級(jí)處理的基礎(chǔ)上,進(jìn)一步采用化學(xué)法(化學(xué)氧化、化學(xué)沉淀等)、物理化學(xué)法(吸附、離子交換、膜分離技術(shù)等)以除去某些特定污染物的一種“深度處理”方法。顯然,污水的三級(jí)處理耗資巨大,但能充分利用水資源。
四、集約化規(guī)模養(yǎng)豬場高濃度污水處理工藝
1.自然處理工藝?自然處理工藝主要包括氧化塘、土地處理系統(tǒng)、污水灌溉系統(tǒng)和人工濕地等。
(1)氧化塘處理工藝?氧化塘又稱為生物穩(wěn)定塘,它是一種利用天然的或者人工整修過的池塘進(jìn)行污水生物處理的方法。常用的穩(wěn)定塘有兼性塘、好氧塘、厭氧塘、水生植物塘等。它對污水的凈化過程和天然水體的自凈過程相似。當(dāng)污水在塘內(nèi)停留較長時(shí)間時(shí),其中含有的有機(jī)污染物就會(huì)被水中微生物的代謝活動(dòng)降解,其中所需的溶解氧可以由藻類通過光合作用和塘面的復(fù)氧作用提供,也可以由人工曝氣法提供。
(2)人工濕地處理工藝?人工濕地就是通過沉淀、吸附、阻隔、微生物同化分解、硝化、反硝化以及植物吸收等途徑以去除廢水中懸浮物、有機(jī)物、氮、磷和重金屬等物質(zhì)。人工濕地技術(shù)實(shí)質(zhì)上就是模擬和強(qiáng)化自然濕地功能的技術(shù)。在人工濕地污水處理系統(tǒng)中,起凈化作用的是植物、基質(zhì)和微生物。
2.生化處理工藝?生化處理工藝主要包括厭氧處理、好氧處理以及厭氧-好氧處理等不同處理組合工藝。另外還有11種變形工藝,如:活性污泥處理工藝、生物濾池處理工藝、生物轉(zhuǎn)盤處理工藝、生物接觸氧化處理工藝、SBR活性污泥處理工藝、氧化溝處理工藝、生物除磷工藝、生物脫氮工藝、吸附再生(接觸穩(wěn)定)工藝、連續(xù)進(jìn)水周期循環(huán)延時(shí)曝氣活性污泥工藝(ICEAS)、MBR膜生物處理工藝等。
3.光合細(xì)菌和EM制劑凈化工藝?EM菌即指有效微生物菌群,而光合細(xì)菌就是其中有代表性的菌種,此外,EM菌還包括放線菌、醋酸桿菌、乳酸桿菌、酵母菌、芽抱桿菌等菌種。光合細(xì)菌和EM制劑在我國自20世紀(jì)90年代以來,作為一種具有特殊營養(yǎng)、促生長、抗病因子和率凈化養(yǎng)殖污水及對環(huán)境和水產(chǎn)動(dòng)物無毒無害的特殊細(xì)菌,在水處理和動(dòng)物養(yǎng)殖等領(lǐng)域中被廣泛應(yīng)用。
五、集約化規(guī)模養(yǎng)豬場高濃度污水處理建議
1.科學(xué)規(guī)劃?集約化規(guī)模養(yǎng)豬場高濃度污水處理首先要確定養(yǎng)殖品種、養(yǎng)殖工藝流程、污水總量、污水水質(zhì)、污水使用方向、污水處理場地、污水處理排放條件;其次根據(jù)養(yǎng)殖場區(qū)建設(shè)情況進(jìn)行污水處理場區(qū)設(shè)計(jì)規(guī)劃,根據(jù)污水濃度制定合理的污水處理工藝,使污水處理實(shí)現(xiàn)真環(huán)保。
2. 合理布局?合理規(guī)劃集約化規(guī)模養(yǎng)豬場布局,針對地方環(huán)境特點(diǎn),對集約化規(guī)模養(yǎng)豬場的發(fā)展進(jìn)行合理規(guī)劃、合理布局,合理劃定適養(yǎng)區(qū)、限養(yǎng)區(qū)、禁養(yǎng)區(qū),確保生產(chǎn)與環(huán)境質(zhì)量提高的協(xié)調(diào)發(fā)展。根據(jù)養(yǎng)殖階段特點(diǎn)、飼料成份、污水養(yǎng)分決定種植業(yè)品種。通過農(nóng)牧結(jié)合,以農(nóng)養(yǎng)牧的方式來解決污水處理問題,使高濃度污水處理后得到真利用。
3.制定合理的污水機(jī)械化處理補(bǔ)貼?整合資源,增加集約化規(guī)模養(yǎng)豬場污水治理資金投入力度,建議在農(nóng)機(jī)購置補(bǔ)貼資金中安排補(bǔ)助資金,用于集約化規(guī)模養(yǎng)豬場高濃度污水無害化處理,主要進(jìn)行固液分離后的污水處理作業(yè)補(bǔ)助。污水處理成本主要由基建投資、設(shè)備投資、運(yùn)行費(fèi)用三個(gè)部分組成,每一環(huán)節(jié)成本都很高,企業(yè)難以承受。以萬頭商品豬場每天產(chǎn)生污水100m3測算,如實(shí)現(xiàn)達(dá)標(biāo)排放前期投資需要450萬元~500萬元(不包括建筑物征地費(fèi)用),后期運(yùn)行費(fèi)用70萬元~100萬元。通過政府污水處理作業(yè)補(bǔ)助政策的實(shí)施,使集約化規(guī)模養(yǎng)豬場高濃度污水實(shí)現(xiàn)真處理。
4.加強(qiáng)監(jiān)管?聯(lián)合環(huán)保部門將集約化規(guī)模養(yǎng)豬場納入日常監(jiān)管范圍,使監(jiān)管成為常態(tài)化,不斷加大集約化規(guī)模養(yǎng)豬場污水處理監(jiān)管力度。通過現(xiàn)代傳感技術(shù)對污水排放量、進(jìn)水COD、BOD等指標(biāo)、出水COD、BOD等指標(biāo)實(shí)現(xiàn)遠(yuǎn)程監(jiān)測,確保高濃度污水處理設(shè)施設(shè)備正常有效運(yùn)行,實(shí)現(xiàn)真監(jiān)管。
5.加強(qiáng)宣傳?加強(qiáng)集約化規(guī)模養(yǎng)豬場污水治理意識(shí)的宣傳與教育,有利于形成全社會(huì)共同參與的防治和監(jiān)督氛圍。通過電視、網(wǎng)絡(luò)、宣傳欄、培訓(xùn)班等方式,大力宣傳和推廣集約化規(guī)模養(yǎng)豬場高濃度污水治理機(jī)械化技術(shù),實(shí)現(xiàn)集約化規(guī)模養(yǎng)豬場的可持續(xù)發(fā)展。
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