Mulch tower treatment system for greywater reuse Part II: destructive testing and effluent treatment

Tandlich, Roman; Zuma, Bongumusa M; Whittington-Jones, Kevin J; Burgess, Jo E

Title: Mulch tower treatment system for greywater reuse Part II: destructive testing and effluent treatment
Creator: Tandlich, Roman, Zuma, Bongumusa M, Whittington-Jones, Kevin J, Burgess, Jo E
Date: 2009
Type: text
Type: article
Identifier: http://hdl.handle.net/10962/71547
Identifier: vital:29863
Identifier: https://doi.org/10.1016/j.desal.2008.03.031
Description: The mulch tower (MT) system described in Part I was tested to failure to determine its range of operating conditions. An increase in the influent temperature led to a statistically significant release of components of the chemical oxygen demand (COD) and the five day biochemical oxygen demand (BOD5), as well as phosphates from the MT system. Heterotrophic plate count (HPC) of the mulch layer dropped from 1.2 (± 0.6) × 106/g dry weight to 1.5 (± 0.3) × 105/g dry weight of the mulch layer with increases of the influent temperature. This indicates that the increase in influent temperature killed off some of the active biomass in the MT biofilm. After a five day drying period under active aeration, the MT system retained the ability to remove COD, total suspended solids (TSS), and nitrates. Greywater treatment by the MT system became impossible after a 48 day drying period under active aeration. Chlorination of the simulated MT effluent with a mixture of sodium dichloroisocyanurate and trichloroisocyanuric acid decreased the faecal coliform concentrations (FC) and the total coliform concentrations (TC) below 800 CFUs/100 ml within 65 h. Beyond 65 h, the pH of the effluent became highly acidic. To maintain optimum performance influent should be fed into the MT system at least once every 5 days, sufficient aeration should be guaranteed, and the MT effluent should be chlorinated for 65 h to eliminate all pathogens before any reuse.
Format: 13 pages, pdf
Language: English
Relation: Desalination, Tandlich, R., Zuma, B.M., Whittington-Jones, K.J. and Burgess, J.E., 2009. Mulch tower treatment system for greywater reuse Part II: destructive testing and effluent treatment. Desalination, 242(1-3), pp.57-69., Desalination volume 242 number 1-3 57 69 June 2009 0011-9164
Rights: Elsevier
Rights: Use of this resource is governed by the terms and conditions of the ScienceDirect Terms and Conditions statement (https://www.elsevier.com/legal/elsevier-website-terms-and-conditions)

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