<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Wayne Parker</style></author><author><style face="normal" font="default" size="100%">Martha Dagnew</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Impact of AnMBR operating conditions on anaerobic digestion of waste activated sludge</style></title><secondary-title><style face="normal" font="default" size="100%">Water Environment Research </style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2020</style></year></dates><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;section id=&quot;wer1361-sec-0001&quot;&gt;
	&lt;p&gt;
		The impact of solids retention time (SRT) and hydraulic retention time (HRT) on anaerobic digestion of thickened waste activated sludge (TWAS) in a pilot‐scale anaerobic membrane bioreactor (AnMBR) was compared with that achieved in conventional anaerobic digestions (CD). The AnMBR was able to successfully digest municipal TWAS at HRTs ranging from 7 to 15&amp;nbsp;days and SRTs ranging from 15 to 30&amp;nbsp;days. Increasing SRT in the AnMBR resulted in a significant improvement in COD and VS removal efficiency when compared against CD operating at the same HRT. The VS and COD destructions (35%–50%) observed in the AnMBR were similar to those observed in CD operating at the same SRT but longer HRTs. Operation at elevated ratios of SRT/HRT resulted in the production of a thickened biosolid (2%–3% TS). Specific methane production values for AnMBR operating at HRT‐SRT ratios of 15–30, 7–30, and 7–15 were 0.19, 0.19, and 0.14&amp;nbsp;m&lt;sup&gt;3&lt;/sup&gt;&amp;nbsp;CH&lt;sub&gt;4&lt;/sub&gt;/kg of COD fed, respectively, showing a 25% increase in methane production with SRT. A model based upon describing hydrolysis of biodegradable solids using first‐order kinetics was able to describe VS destruction as a function of SRT.
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	&lt;p&gt;
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	&lt;h3 id=&quot;wer1361-sec-0002-title&quot;&gt;
		Practitioner points
	&lt;/h3&gt;

	&lt;ul&gt;
		&lt;li&gt;
			The AnMBR process was able to successfully digest waste activated sludge at a shorter seven‐day HRTs
		&lt;/li&gt;
		&lt;li&gt;
			Operation at elevated ratios of SRT/HRT resulted in enhanced biogas and thickened biosolid (2%–3% TS) production requiring reduced downstream processing
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		&lt;li&gt;
			The AnMBR process produces a particle‐free permeate that might be suitable for side stream nutrient recovery
		&lt;/li&gt;
		&lt;li&gt;
			A model developed by considering hydrolysis as a limiting process can be used to determine design SRTs.
		&lt;/li&gt;
	&lt;/ul&gt;

	&lt;p&gt;
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&lt;/section&gt;

&lt;section id=&quot;wer1361-sec-0002&quot;&gt;
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&lt;/section&gt;
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