Title

The use of biochar and crushed mortar in treatment wetlands to enhance the removal of nutrients from sewage

Document Type

Journal Article

Publication Title

Environmental Science and Pollution Research

Publisher

Environmental Science and Pollution Research

School

School of Engineering

RAS ID

27658

Comments

Originally published as:

Saeed, T., Yasmin, N., Sun, G., & Hasnat, A. (2018). The use of biochar and crushed mortar in treatment wetlands to enhance the removal of nutrients from sewage. Environmental Science and Pollution Research. Advance Online Publication.

Original article available here.

Abstract

An experimental study was carried out using in pilot-scale constructed wetland systems, operated in parallel to treat raw sewage. Each system consisted of a vertical flow (VF) unit that was filled with biochar as the main media, followed by a horizontal flow (HF) unit filled with crushed cement mortar. Hydraulic loading (HL) ranged 340–680 mm/day was applied on the VF wetland units, where high total nitrogen (TN) mass removal rate (20–23 g N/m2 d) was obtained, demonstrating that biochar media had a beneficial effect on the degradation of nitrogenous pollutants. Total phosphorus (TP) removal percentage (concentration based) was ≥ 86% in HF wetlands packed with mortar materials. In one system, the flow direction of the sewage was directed by the deployment of downflow pipes and vertical baffles, aiming to facilitate the formation of aerobic and anaerobic zones in the wetland matrices. The effects of such arrangement were analyzed by comparing pollutant removal efficiencies in the two systems. On average, 99, 96, 93, and 86 percentage removals were obtained for ammonia (NH4-N), TN, biochemical oxygen demand (BOD), and TP, respectively, during the experiments. Biochar and crushed mortar proved to be a highly effective combination as media in subsurface flow constructed wetlands for wastewater treatment.

DOI

10.1007/s11356-018-3637-z

Access Rights

Free_to_read

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