污水的有机物浓度对工艺选择有很大关系。当进水有机物浓度高时，AB法、厌氧酸化/好氧法比较有利。AB法中的A段只需较小的池容和电耗就可去除较多的有机物，节省了基建费和电耗，污水有机物浓度越高，节省的费用就越多。厌氧处理要比好氧处理显著节能，但只有在浓度较高时才显示出优越性。当有机物浓度低时，氧化沟、SBR等延时曝气工艺具有明显的优势。在要求除磷脱氮的场合须选用稳定可靠的生物除磷脱氮工艺。

　　7、污泥的处理处置

　　在我国的城市水污染治理中，污水处理厂污泥处理处置费用约占工程投资和运行费的25%~45%。污水处理厂污泥处理处置高昂的投资及其运行费用，一方面使得目前国内大部分污水处理厂未对污泥进行稳定处理或处理工艺的配套设施不完善，另一方面也使得建有完善污泥处理设施的污水处理厂常因其运行费用较高而基本停用。随着我国城市污水处理设施的普及，处理率的提高和处理程度的深化，污泥的产生量将有较大的增长，预计到2010年，我国城市污水处理厂的湿污泥年产量将达2000余万t，污泥的处理处置将成为难题。而通过技术改进和革新，降低污水处理厂的污泥产生量；研究开发先进的污泥处理工艺，提高污泥处理系统的效率，降低污泥处理成本；研制出技术先进、经济高效的国产污泥处理成套设备；积极进行污泥资源化利用研究等是解决当前及今后我国城市污水处理厂污泥处置问题的有效途径。

　　根据我国污水处理技术政策，城市污水处理产生的污泥，应采用厌氧、好氧和堆肥等方法进行稳定化处理，也可采用卫生填埋方法予以妥善处置；处理能力在10万m3/d以上的污水二级处理设施产生的污泥，宜采取厌氧消化工艺进行处理，产生的沼气应综合利用；处理能力在10万m3/d以下的污水处理设施产生的污泥，可进行堆肥处理和综合利用；采用延时曝气技术的污水处理设施，污泥需达到稳定化；采用物化一级强化处理的污水处理设施，产生的污泥须进行妥善的处理和处置；经过处理后的污泥，达到稳定化和无害化要求的，可农田利用；不能农田利用的污泥，应按有关标准和要求进行卫生填埋处置。  

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