Reusing biogas slurry (BS) in agricultural drip irrigation systems may provide a solution to deal with the adverse environmental impacts of applying BS. Biofouling and scaling are two leading issues in drip irrigation emitters. This study investigated a practice that applied electromagnetic fields (EMFs) to control biofilms and scales. The bacterial communities and mineral precipitations in the clogging substances of emitters were determined. Results showed that EMFs inhibited the growth of microbes, and influenced BS physicochemical parameters. Consequently, EMFs shifted the bacterial communities with reduced diversities. Network analyses revealed that bacterial species under EMFs treatments showed lower average connectivities and simpler interactions, which were responsible for the decreases of extracellular polymers substances (EPS). Moreover, EMFs treatments not only reduced the carbonates in emitters, but also prevented the depositions of phosphates, silicates, and quartzes. EMFs also had impacts on the lattice parameters and crystal volumes of carbonates. In addition, the changes in bacterial communities and EPS contents were associated with the reductions of various minerals. Accordingly, EMFs effectively mitigated biofilms and scales with the fixed clogging substances reduced by 29.1–53.8 %. These findings demonstrated that applying EMFs is an effective anti-biofouling and anti-scaling treatment with potential applications in BS irrigation systems.

在农业滴灌系统中重复使用沼液（BS）可能会提供解决方案，以应对使用BS的不利环境影响。生物污垢和水垢是滴灌喷头中的两个主要问题。这项研究调查了一种应用电磁场（EMF）来控制生物膜和水垢的实践。确定了排放物堵塞物质中的细菌群落和矿物质沉淀。结果表明，EMFs抑制微生物的生长，并影响BS的理化参数。因此，EMF使细菌群落的多样性降低。网络分析表明，在EMF处理下的细菌物种显示出较低的平均连通性和更简单的相互作用，这是导致细胞外聚合物物质（EPS）减少的原因。此外，EMFs处理不仅减少了发射器中的碳酸盐，而且还防止了磷酸盐，硅酸盐和石英的沉积。电动势也影响碳酸盐的晶格参数和晶体体积。此外，细菌群落和EPS含量的变化与各种矿物质的减少有关。因此，EMF有效地缓解了生物膜和结垢，固定堵塞物减少了29.1-35.3％。这些发现表明，EMF的应用是一种有效的抗生物污垢和防垢处理，在BS灌溉系统中具有潜在的应用前景。细菌群落和EPS含量的变化与各种矿物质的减少有关。因此，EMF有效地缓解了生物膜和水垢，固定堵塞物减少了29.1-35.3％。这些发现表明，EMF的应用是一种有效的抗生物污垢和防垢处理，在BS灌溉系统中具有潜在的应用前景。细菌群落和EPS含量的变化与各种矿物质的减少有关。因此，EMF有效地缓解了生物膜和结垢，固定堵塞物减少了29.1-35.3％。这些发现表明，EMF的应用是一种有效的抗生物污垢和防垢处理，在BS灌溉系统中具有潜在的应用前景。