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首页> 外文期刊>Applied Engineering in Agriculture >Effects of chlorination schemes on clogging in drip emitters during application of sewage effluent.
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Effects of chlorination schemes on clogging in drip emitters during application of sewage effluent.

机译：氯化方案对污水排放中堵塞物的影响。

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摘要

Chlorination is usually an economic method for treating clogging in drip emitters due to biological growth during sewage application. However, limited information is available for determining an optimal chlorination scheme. In this study, experiments were conducted to quantify the impact of chlorine injection concentrations and intervals on clogging and system performance of drip irrigation units that are used to apply a stored secondary effluent. Various chlorination schemes with concentrations of free chlorine residual at the end of laterals ranging from 0 to 10 mg L-1 and injection intervals ranging from one to four weeks were assessed using seven types of emitters with a nominal discharge of 1.0 to 2.6 L h-1 at 0.1-MPa pressure. It was found that emitter clogging was significantly affected by chlorination scheme and emitter type as well as their interaction. Clogging was greatly reduced by chlorination, especially for the emitters with a nominal discharge of less than 1.38 L h-1. Chlorination is therefore highly recommended for emitters with a relatively small discharge when sewage effluent is applied. Both the chlorine concentration during chlorination and the injection frequency had an impact on the effectiveness of reducing clogging. The weekly chlorination of 1.5 and 2.5 mg L-1 of free chlorine residual at the end of laterals and the biweekly chlorination at 5 mg L-1 generally produced less clogging and more uniform water application than the weekly chlorination at 0.5 mg L-1 and the chlorination every four weeks at 10 mg L-1. In general, a more frequent chlorination at a lower concentration is more effective in maintaining good system performance than a less frequent chlorination at a higher concentration, and is therefore recommended by this study.
机译：氯化通常是一种经济的方法，用于处理由于污水处理过程中的生物生长而引起的滴头堵塞。但是，有限的信息可用于确定最佳氯化方案。在这项研究中，进行了实验，以量化注氯浓度和间隔时间对滴灌设备堵塞和系统性能的影响，这些滴灌设备用于存储储存的二次废水。使用七种标称排放的排放器评估了各种氯化方案，其中各分支末端的游离氯残留浓度范围为0至10 mg L -1 ，注入间隔为一至四周在0.1 MPa压力下为1.0至2.6 L h -1 。发现发射器堵塞受氯化方案和发射器类型及其相互作用的影响很大。氯化大大减少了堵塞现象，特别是对于标称排放量小于1.38 L h -1 的排放源。因此，在使用污水时，强烈建议将氯化物用于排放量相对较小的排放源。氯化过程中的氯浓度和注入频率都对减少堵塞的效果有影​​响。在分支结束时，每周进行1.5和2.5 mg L -1 残留的游离氯的氯化，而每两周进行一次5 mg L -1 的氯化，则产生的堵塞更少，而更多每周加水0.5 mg L -1 和每四周加氯10 mg L -1 进行均匀的水施用。通常，在较高浓度下进行更频繁的氯化处理比在较高浓度下进行较不频繁的氯化处理更有效地保持良好的系统性能，因此，本研究建议使用这种方法。

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