A Highly Packed Biofilm Reactor with Cycle Cleaning for the Efficient Treatment of Rural Wastewater

Abstract

Biological treatment processes perform satisfactory in wastewater treatment, but the relatively high cost and complicated maintenance limit its application in rural areas. In this study, a highly packed biofilm reactor (HPBR), with a 90% packing ratio of carriers in the bioreactor, was designed for rural wastewater treatment. The results showed that the removal rates for chemical oxygen demand (COD) and ammonia were 3.04 ± 1.81 kg/m3/d and 0.49 ± 0.18 kg/m3/d, respectively. Besides, the removal efficiency of total inorganic nitrogen (TIN) was 35.4% by the HPBR. The removal capacity of the HPBR is higher than other reported systems with fewer operational costs and maintenance. High-throughput sequencing was applied to further investigate the kinetics and principals. Microorganisms capable of simultaneous nitrification-denitrification were found to be dominant species in the HPBR system, which indicated that the nitrogen removal in HPBR is governed by simultaneous nitrification-denitrification. These findings suggest that HPBR can be used as an efficient reactor for rural wastewater treatment, demonstrating its feasibility in real applications.

Application of Biofilm Water Conservation and Emission Reduction Technology in the Pond Culture of Largemouth Bass and Japanese Eel

“…When there is a large accumulation of harmful substances in the aquaculture water body, the traditional solution is to discharge these harmful substances through a large number of water changes but this method will not only cause a waste of water and electricity resources; the discharge of untreated aquaculture wastewater may also cause secondary pollution of the water body. Biofilm water purification technology is a popular technology developed in recent years for freshwater aquaculture pond tailwater treatment type [19]. Compared with the traditional method, the biofilm method has the advantages of high efficiency and low economic cost in the process of water body remediation.…”

Application of Mesopore-Activated Red Mud for Phosphorus Adsorption

“…There are several methods of phosphorus treatment such as biological removal, precipitation, adsorption, and ion exchange [2,3]. Biotechnology is widely applied to remove phosphorus in water due to low operating costs, but the phosphorus removal efficiency is not satisfied with the requirements [4]. In recent years, many modern techniques and technologies have also been applied such as electrolysis and reverse osmosis membrane [5][6][7].…”