PHYSICOCHEMICAL AND BIOLOGICAL TREATMENT OF A CONCENTRATED INDUSTRIAL LEACHATE FROM AGED PROCESS WASTE AT A VISCOSE RAYON PRODUCTION FACILITY
Abstract:Viscose Rayon process waste was disposed of in open surface impoundments and resulted in the formation of a concentrated leachate, which is now associated with a semi-solid, cellulose-based waste material. Since the alkaline leachate is a presumed source for a groundwater plume extending down-gradient from the surface impoundments, the leachate “source” may require extraction and treatment as a component of the remedial action. This work represents a preliminary experimental evaluation to develop treatment concepts for discharging the leachate to a surface water receiving stream. The contaminants of concern for the leachate include high levels of carbon disulfide (CS2) and hydrogen sulfide (H2S), as well as heavy metals such as arsenic, antimony, and zinc. The leachate also contains high levels of dissolved silica and soluble cellulose xanthate, which is stable at high pH but degrades to form insoluble cellulose and CS2 at neutral and acidic pH. Due to the cellulose and reduced sulfur compounds, the leachate is characterized by a BOD and COD of about 5,000 and 14,000 mg/L, respectively. Neutralization of pH 10.2-10.3 leachate samples to pH 6-7 caused the precipitation of cellulose and amorphous silica and the volatilization of H2S and CS2. This process alone provided approximately 60% BOD and COD removal. It is expected that gas phase treatment will be required to manage H2S and CS2 emissions, however oxidant addition prior to neutralization could significantly reduce the emission rate. The effluent from the leachate neutralization process should be readily amenable to aerobic biological treatment.
Document Type: Research Article
Publication date: 2002-01-01
More about this publication?
- Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed. A subscription to the Proceedings of the Water Environment Federation includes access to most papers presented at the annual WEF Technical Exhibition and Conference (WEFTEC) and other conferences held since 2000. Subscription access begins 12 months after the event and is valid for 12 months from month of purchase. A subscription to the Proceedings of the Water Environment Federation is included in Water Environment Federation (WEF) membership.
WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access. Access begins 12 months after the conference or event
- Subscribe to this Title
- Membership Information
- About WEF Proceedings
- WEFTEC Conference Information
- Learn about the many other WEF member benefits and join today
- Ingenta Connect is not responsible for the content or availability of external websites