Preparation and application of embedded and immobilized Achromobacter sp. agent for effective removal of ammonia nitrogen from water

摘要

A novel wastewater-quality-improver, Sodium Alginate Embedded Microbe-treated Zeolite (SAEMZ), was proposed. The strains used are screened from black-odorous water and have high-efficiency NH4+-N degradation performance. The Gram-positive bacteria, belong to Achromobacter sp., was determined through the screening and identification for this strain, whose removal rate of NH4+-N can reach 88.06, to decrease the NH4+-N's concentration from 61.83 mg/L to 7.80 mg/L, and its optimal growth conditions are pH 7-8, rotation speed 150-210 r/min, temperature 25-35 degrees C. The SAEMZ's removal effect on NH4+-N were considered in this research from aspects of reusability, storage stability, and the effects of dosage, coexisting ions, and wastewater's concentration. The increase of the SAEMZ's dosage effectively improved NH4+-N's removal rate; Ca2+ in the solution promoted NH4+-N's removal rate, while Mg2+ and Mn2+ inhibited it. Also, NH4+-N's removal rate improved slightly with Fe2+ concentration's increase and then decreased significantly; With the increase of wastewater's dilution factor, NH4+-N's removal rate showed an upward trend and with the increase of the SAEMZ's reuse times, it decreased. Therefore, recycle times should be controlled less than 3 times in practical application; The SAEMZ still maintains its physiological stability, high mechanical strength, and good storage stability after stored at 4 degrees C for 120 days.