Two­stage treatment of solid waste leachates in aerated lagoons and at municipal wastewater treatment plants

Myroslav Malovanyy,Vira Sliusar,Volodymyr Zhuk,Andriy Sereda

doi:10.15587/1729-4061.2018.122425

Twostage treatment of solid waste leachates in aerated lagoons and at municipal wastewater treatment plants

Myroslav Malovanyy, Vira Sliusar + Show 2 more

Open Access

https://doi.org/10.15587/1729-4061.2018.122425

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Abstract

The two-stage technology of treatment of the leachates of the municipal solid waste (MSW) dumps in aerated lagoons and at municipal wastewater treatment plants (WWTP) has been studied. The study objective was to develop a technology that can be implemented at existing MSW dumps and landfills. Static and dynamic modes of implementation of both stages of the technology were investigated on the model units. Static 16-day mode was experimentally studied in the aerated lagoon conditions. As a result, we have managed to achieve almost a 2-fold reduction of COD and more than a 3-fold decrease in concentration of ammonium ions. Dynamic mode studies have established that the optimal time of leachate staying in the reactor was 10 days. Change of the relative concentration of ammonium nitrogen in the leachate largely depends on the process temperature, so in real conditions, it is necessary to adjust the modes of realization of the individual stages depending on the ambient temperature. It has been established that for treatment of leachate at municipal WWTP in a static mode at the value of the ratio of leachate dilution with municipal sewage of 1:1000, the maximum effect of treatment of both from ammonium ions and COD was achieved. The study of leachate treatment at municipal WWTP in a dynamic mode has confirmed stability of maintaining the treatment indicators in time. By implementation of the two-stage technology of leachate treatment, it will be possible to minimize environmental hazard from surface and ground water contamination in the zone of influence of MSW dumps and landfills

Highlights

The problem of treatment leachate of municipal solid waste (MSW) dumps and MSW landfills exists throughout the periods of design, operation and planned closure of these facilities
The problem consists in the choice of a leachate treatment system at the stage of closing the MSW dumps for which the often uncontrolled leakage of filtrates has led to their significant accumulation in storage ponds
The problem is especially acute for Ukraine, because of a large number of the MSW dumps that require their closure for a long time

Summary

Introduction

The problem of treatment leachate of municipal solid waste (MSW) dumps and MSW landfills exists throughout the periods of design, operation and planned closure of these facilities. It should be noted that most of the MSW storage facilities in Ukraine are essentially dumps, not landfills. Unlike the MSW dumps, MSW landfills are engineering structures. They are equipped with a protective anti-filtering screen, leachate and biogas collection and disposal systems, a system of technical and biological remediation of garbage-filled land lots, a system of collection and removal of conditionally clean atmospheric water. At the stage of designing up-to-date MSW landfills, an innovative technology of treatment of leachate collected by drainage systems is used. Productivity of this technology corresponds to the design productivity. The problem is especially acute for Ukraine, because of a large number of the MSW dumps that require their closure for a long time

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