Trickling filter

About: Trickling filter is a research topic. Over the lifetime, 1098 publications have been published within this topic receiving 20219 citations.

Removing Organic Matter and Nutrients from Swine Wastewater after Anaerobic–Aerobic Treatment

Abstract: Anaerobic digesters generate effluent containing about 3000 mg L−1 of organic matter in terms of chemical oxygen demand (COD). This effluent must be treated before being reused or discharged into the environment. The objective of this study was to evaluate the efficiency of a trickling filter packed with red volcanic rock for the treatment of anaerobic digester effluent with COD concentrations of around 3000 mg L−1. The trickling filter consisted of an aluminum cylinder, 2 mm thick, 3 m high, and 1 m in diameter. To evaluate the efficiency of the treatment system, there were three experimental runs, each lasting 20 days (d). The predictor variable was the initial COD concentration, which ranged from 2002 to 3074 mg L−1. The hydraulic retention time was 9 h. The influent flow was 2.2 L min−1, which amounts to a hydraulic load of 4033 m3 m−2 day−1 and an organic load of 0.006342 to 0.009738 kg m−3 day−1 of COD. Independent of the initial concentration, COD removal efficiency was very high, varying from 90 to 96%. Final effluents met all the maximum permissible limits to be used as irrigation water, as well as for its release into natural or artificial water reservoirs, stored for agricultural crop irrigation.

Studies on the biological stabilization of thin stillage. i. aerobic fermentation.

Abstract: Thin stillage was subjected to aerobic fermentation in both batch and semi-continuous studies, involving forced aeration, sedimentation, and recirculation through a modified trickling filter. The a...

Operational experiences with structured plastic media filters: 10 years on

Abstract: The performance of 10 cross flow structured plastic media trickling filter plants is discussed. The sites are arranged in a number of configurations with the plastic media filters operating as sole secondary process units, in parallel with other process units or in double filtration configuration. Data for 2003 and 2004 show that the plants are performing well. Data are presented for the plastic media filter stream where it is available. Two operational problems are discussed; overgrazing of nitrifying biofilms by excessive populations of snails and loss of nitrification performance in cold weather, particularly on smaller sites. Overgrazing by snails, identified as Lymnaea peregra has been controlled on one site by the annual treatment of an isolated filter with high ammoniacal nitrogen strength sludge dewatering liquors. On a second site suffering a similar problem the plastic media filter duty was changed from single filtration to being the primary filters in a double filtration system with existing stone media filters used for secondary filters. Loss of nitrification performance has been associated with excessive heat loss on some sites. Filters built as tower structures, with typically 4–5 m media depth allow easy control of airflow via restriction of the engineered ventilation openings at the base of the filter. This has been found to have a direct impact on the degree of cooling. However, airflow control on plastic media retrofitted into wide shallow stone media filter shells with 1.6–2 m media depth is more difficult. These structures offer less opportunity for control of airflow and associated heat losses.