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    [廢水處理] 養殖業廢水處理技術應當遵循生態學原理

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    hongchun實名認證 發表于 3 天前 | 只看該作者 |閱讀模式 打印 上一主題 下一主題
    作為世界上最大的養豬國,中國養豬業在現代經濟發展中起著決定性的作用,但同時也給環境污染帶來了挑戰。生豬生產中的糞便、尿污染問題不能及時有效地解決,這將制約養豬場發展的規模和模式,甚至在一定程度上危及生態安全。

    水產養殖廢水的主要處理技術

    1、自然處理法

    利用自然污水自凈的原理發揮其作用。包括土地處理系統和水生植物處理系統。常用方法包括生物池塘,土壤處理方法和人工濕地處理。氧化池使用天然或人工構建的池塘進行廢水的生物處理。污水長時間停留在池塘中,而水中的微生物可以代謝并降解有機污染物。通過藻類的光合作用和池塘表面的復氧實現溶解氧,可以大大減少水體中的有機污染物,并在一定程度上去除水中的氮和磷,減少水體的富營養化。 。

    由于其投資少、運行成本低,在有足夠的土地利用條件下,自然處理方法是比較經濟的。更適用于小型農場的污水處理。

    2、人工好氧處理法

    需氧處理的基本原理是利用微生物在需氧條件下分解有機物,同時合成自己的細胞,生物降解的有機物最終可以被完全氧化為簡單的無機物。包括活性污泥、接觸氧化和生物轉盤。氧化溝是一種改良的活性污泥工藝。一般不可能使用一階有氧方法來滿足豬場污水處理的標準,必須進行多級系列,如使用酸化和三級接觸氧化工藝來處理豬場污水。

    3、厭氧-好氧處理法

    養豬場廢水是一種相對難以處理的有機廢水,因其排水量大,溫度低,廢水中混合固體和液體,有機物含量高,氮,磷含量豐富,易于去除。它純粹使用物理,化學或生物方法。難以滿足排放要求。進一步的好氧處理通常用作厭氧處理的二次凈化,這也是處理高濃度有機污水的良好方法,也是許多大型養豬場采用的廢水處理方法。處理后的污水基本達到國家排放標準,減少氮,磷的環境污染。

    4、人工厭氧處理法

    厭氧處理或沼氣工程是在提高污泥濃度、提高污泥與廢水的混合效果的基礎上,發展起來的一系列高負荷反應器。厭氧處理具有占地少、能耗低、產沼氣等特點。處理過程不需要氧氣。具有較高的有機負載潛力,能降解好氧微生物不能降解的部分。厭氧廢水在可利用土地條件下可作為液態有機肥返回現場,但往往排放量大,給運輸和使用帶來不便。

    水產養殖廢水處理作為一個系統工程,需要遵循生態學的原則,結合各種處理方法,形成科學的綜合利用,實現豬場水經處理后的循環利用標準,有效改善養殖環境,減少對周圍環境的威脅。

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