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Implementer's Guide to Lime Stabilization for Septage Management in the Philippines
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- Klawitter
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Re: Implementer's Guide to Lime Stabilization for Septage Management in the Philippines
Heading the UNICEF WASH Team for Yolanda response 2013-2015 when the lime stabilisation plants for Tacloban were constructed as an emergency option ONLY for bunkhouse and evacuation centres at the peak of the emergency response I would like to refer you to the SUSANA project site providing details on PhATS (Philippines Approach to Total Sanitation in Haiyan affected areas) here at Susana Forum , which provides more details on how the lime stabilisation ponds were set up in two locations as an emergency treatment option and how this links to the overall approach moving from emergency to development within a systems approach to scale up sanitation in partnership with NGOs and government. This set the ground to develop and construct a sophisticated ABR based WWT which is now functional, (to be operated by the City of Tacloban).
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You need to login to reply- sahidul93
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Re: Implementer's Guide to Lime Stabilization for Septage Management in the Philippines
Assistant WASH Officer
UNHCR, Cox’s Bazar, Bangladesh
Mobile: +8801712124330
www.unhcr.org
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I also posted a presentation on possible use of ATAD systems, but this hasn't been tested under such conditions: forum.susana.org/280-faecal-sludge-treat...treatment-kits#22225
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You need to login to reply- sahidul93
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Re: Implementer's Guide to Lime Stabilization for Septage Management in the Philippines
I am working with UNHCR at Cox's Bazar, Bangladesh where the largest influx happened recently. Some of our partners have already started lime stabilization as this is a real challenge to manage the excreta rather than septage. As this is more of fresh sludge, the technology might be a good option. Biogas also may be a good option.
I have some experiences on FSM, working in urban areas of Bangladesh. But in Rohingya camps, the scenerio is totally different. Collection is the real challenge as they are staying at the top, middle and valley of the hill, transportation is very difficult.
@Dave Robbins: you mentioned about working in Myanmar. What is the results now?
What are the sequences of lime stabilization: Dewatering, Solid-Liquid separation, Drying bed, Leachate treatment (Constructed Wetland),
Any better idea?
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Md.Sahidul Islam
Assistant WASH Officer
UNHCR, Cox’s Bazar, Bangladesh
Mobile: +8801712124330
www.unhcr.org
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Assistant WASH Officer
UNHCR, Cox’s Bazar, Bangladesh
Mobile: +8801712124330
www.unhcr.org
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You need to login to reply- dmrobbins10
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Re: Implementer's Guide to Lime Stabilization for Septage Management in the Philippines
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Re: Implementer's Guide to Lime Stabilization for Septage Management in the Philippines
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Re: Implementer's Guide to Lime Stabilization for Septage Management in the Philippines
Could you please suggest how the said research on the effectiveness of ABRs (including Anaerobic Filter) and wetlands for dealing with lime impacted effluent could possibly be carried out in a simple way. And are there any potable equipment you know that could possibly be used for testing necessary parameter onsite? Thank you again for responding and for helping in taking this discussion ahead.
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Re: Implementer's Guide to Lime Stabilization for Septage Management in the Philippines
From my perspective, for municipal FSM systems using the technology, best to first concentrate the biosolids using sedimentation or some other process prior to dosing with lime. That will minimize the amount of high pH liquids, which could then be reintroduced into the liquids stream for treatment. One could also mix the effluent with water from hand wash facilities at the site, and even septic tank effluent from the facility restrooms to dilute the lime treated effluent while reinoculating the effluent with microbes. My guess is that traditional effluent treatment systems would function well in this type of scenario, although to my knowledge, that has not yet been tested. It would be very interesting to do some research on the effectiveness of ABRs or wetlands for dealing with lime impacted effluent to be sure.
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You need to login to replyRe: Implementer's Guide to Lime Stabilization for Septage Management in the Philippines
Query by kharallaxman is still unanswered. The issue has been discussed previously on the forum. Use of lime stabilisation at some sites in Philippines has been highlighted previously. You also mentioned it. However, it does not mention treatment technology of filtrate. Disposed of effluent on solid waste dumping ground is not a solution. pH may come to neutral as mentioned by kharallaxman. But what is time requirement?
Application of lime has been reported for some sites in Cambodia. If someone has report on treatment of effluent in that country, pl. share.
During previous discussion I had raised some fundamental query. Lime does not cause stabilisation. Lime stabilisation is a misnomer. Killing of bacteria / pathogens is not stabilisation. Purpose of septage management is the safe reuse of solid as well as liquid parts. Lime may have beneficial for one part but causes serious problem for another part.
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Pawan
Chairman
Foundation for Environment and Sanitation
Mahavir Enclave
New Delhi 110045, India
Web: www.foundation4es.org
Linked: linkedin.com/in/drpkjha
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kharallaxman wrote: Thanks for the response. The problem sought to be addressed here is not pH neutralization however - the pH after lime application is reported to come to neutral naturally. The question is how to make sure that biological treatment processes following lime application would not be compromised due to the dying of pathogens and halting of microbial degradation due to the lime application.
Not sure I can follow...
While the pH will probably decline a bit due to the drying bed process removing some precipitated lime and natural CO2 capture from the atmosphere, this will take quite some time and I doubt it will reach neutral levels easily. But again, theoretically speaking, as while I have visited such a lime treatment plant in the Philippines, I was not involved in the day to day operation and process optimization.
Thus the problem to my understanding is the high pH that will have a strong impact on any subsequent biological treatment process or natural streams if directly discharged (in the system I visited it was discharged into a solid-waste dump side and thus there was little to make worse). After all the two main purposes of adding quicklime are to stabilize/precipitate solids in the sludge and the same time rise the pH to levels that kills most of the pathogens.
However besides having to neutralize the pH, it might also be necessary to inoculate any biological treatment process with bacteria from a well running system as the percolate from the lime treatment system will have few beneficial bacterial left to colonize the biological treatment system by itself.
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- Implementer's Guide to Lime Stabilization for Septage Management in the Philippines