Elimination of Clogging of a Biogas Slurry Drip Irrigation System Using the Optimal Acid and Chlorine Addition Mode

As an emerging contaminant, the clogging substances of emitters in biogas slurry drip irrigation systems affect efficient return and utilization to field a great extent. This can be prevented using acid chlorination as engineering measures. Through hydraulic performance test sampling detection analysis, under same addition conditions (pH = 5.5–6.0), three chlorine concentrations (0, 1–3, 4–9 mg/L) four cycles (6, 10, 14, 20 days) were tested, aimed clarify influence parameters (chlorine adding cycle, concentration, etc.) on anti-clogging system. The results showed that compared with no treatment (CK), only reasonable combination significantly reduce probability serious complete emitters, they stabilize relative average flow by more than 75%. measures change distribution characteristics at front rear belt. Furthermore, promote migration belt, facilitating located thereat. sequential inhibit growth extracellular polymer emitter, effect inhibiting increase is relatively poor when period excessively long or short. There exists negative correlation between content emitter flow. Based obtained results, ensure excellent systems, for acid-only measures, dosing cycle recommended 10 days. When are implemented sequentially, 14 days concentration 1–3 mg/L, respectively. study has important scientific significance practical value establishment long-term operation management protection technologies large-scale systems.