SuSanA - Forum Kunena Site Syndication Mon, 21 Apr 2014 13:16:26 +0000 Kunena 1.6 SuSanA - Forum en-gb Re: Faecal Management Enterprises (FaME) project - using dried faecal sludge as a solid biofuel in industrial kilns - Senegal, Uganda and Ghana - by: dorothee.spuhler
Moritz wrote:

Engagement of private enterprises:
Simply raising awareness on the “theoretical” benefits of using FS as a fuel is not sufficient to engage industries. We directly pointed out the benefits of using FS as a fuel in their industry by the calorific value study which proved that the energy potential of FS is comparable to other local biofuels. …

If it is too early that the argument of the calorific value is enough convincing for industries: are you already looking other arguments (e.g. working on external factors such as the legal framework)? Or do you assume that optimizing the production technology bringing costs down and efficiency up will do the job?]]>
Faecal sludge management Mon, 14 Apr 2014 15:16:38 +0000
Re: Appropriate Septic tank Cleaning Frequency - by: pkjha
In an over sized septic tank -cleaned after 5-10 years, sludge at bottom of the tank becomes more compact. In such case tank can't be emptied through sludge pump.It requires manual labour to clean the bottom of the tank. In some cases such sludge is disintegrated applying forced water. It is a cumbersome process and there is unnecessary loss of water.Cost of such septic tank is obviously quite high. It discourages other people of the community to adopt this technology. In case of over size tanks, quality of effluent- in term of BOD, COD, suspended solids would be better in early months due to high retention time of the tank. However, at later stage -when the tanks are filled, quality of effluent would decrease considerably.
Faecal sludge management Mon, 14 Apr 2014 06:51:54 +0000
Re: Appropriate Septic tank Cleaning Frequency - by: aasimmansuri
Following is a link to the page from where you may find more details on the Haiphong septage Management.

Hope its useful.

Faecal sludge management Mon, 14 Apr 2014 04:57:12 +0000
Re: Appropriate Septic tank Cleaning Frequency - by: jonpar Faecal sludge management Wed, 09 Apr 2014 21:45:54 +0000 Re: Solar Sanitation for Fecal Sludge Management - by: AFoote
We've been very busy working on toilets, treatment, and transformation. Thank you to everyone who has given us inputs along the way.

We're very exited about our upcoming pilot in Kakuma refugee camp where we get an opportunity to pilot an entire alternative sanitation system in the camp from mobile toilets, to solar treatment, and our re-use method of making briquettes from treated human waste. With support we plan on scaling our work and bio-briquette production in Naivsaha.

Below is a link to our recent newsletter that goes into more detail (including pretty pictures!) if you're interested. Thanks for all your support!

Pictures such as these two:

Faecal sludge management Wed, 09 Apr 2014 09:06:45 +0000
Re: Appropriate Septic tank Cleaning Frequency - by: cecile christoph wrote:
situations where no grey water goes to the septic tank help a lot (just practical observation by operating a fecal sludge truck, no scientific investigation)

@ Christoph : what could be the reason for this, Christoph ?
I would tend to think that on the contrary, if there is no grey water in the septic tank then the fluid inside the septic tank would be quite viscous and too thick to pump out. I have heard (but I haven't seen in directly) that in that case the desludging operators have to introduce (pressurised) water to facilitate the suction.

@Jonpar : the same system exists in Manila in the Philippines. I attached an extract of research and presentation (dates back to 2008)

Some time ago we had a discussion on the forum ( Effective Microorganisms in the form of additives / powders sold on the market and their efficiency on decreasing sludge formation at the bottom of the tanks and therefore spacing the clearing frequency. I talked about this with a decentralised sanitation technician who said he observed a very good effectiveness of the Eparcyl additive : one mechanical action because the powder is made of small solids, sort of small balls which are suspended in the liquid area of the sludge (media to fix bacteria) and contains biological agents which enhance the bacterial activity (yogourt type bacteria). Without being a magical treatment it seems that it does have a positive impact on the clearing frequency.


Faecal sludge management Tue, 08 Apr 2014 09:43:54 +0000
Re: septage management in Haiphong - by: jonpar Faecal sludge management Mon, 07 Apr 2014 21:33:14 +0000 eVac - pit emptying device from South Africa with small vacuum pump - by: stevensugden Faecal sludge management Thu, 03 Apr 2014 07:43:32 +0000 Re: Looking for a Gulper in West Africa - by: stevensugden Faecal sludge management Thu, 03 Apr 2014 07:33:22 +0000 Re: Looking for a Gulper in West Africa - by: stevensugden Faecal sludge management Thu, 03 Apr 2014 07:28:56 +0000 Re: Waste to Energy Technical and Financial Analysis, India - by: suniliitian
Please share the link where these files are uploaded. I would also like to know your interest and work in municipal waste disposal. You can alternatively write to my email id -

Faecal sludge management Mon, 24 Mar 2014 06:03:48 +0000
Re: Looking for a Gulper in West Africa - by: muench

Faecal sludge management Fri, 21 Mar 2014 09:04:34 +0000
Re: Waste to Energy Technical and Financial Analysis, India - by: kevinjoan thanks for making these reports available.
I have now uploaded them ,I am sure these reports will be useful for other people .moreover I study the municipal waste disposal knowledge,thank you again.]]>
Faecal sludge management Thu, 20 Mar 2014 09:25:32 +0000
Re: Looking for a Gulper in West Africa - by: snghosh Faecal sludge management Thu, 13 Mar 2014 16:59:43 +0000 PhD Dissertation by Tunde Bakare: SCIENTIFIC AND MANAGEMENT SUPPORT FOR VENTILATED IMPROVED PIT LATRINES (VIP) SLUDGE CONTENT - by: ChrisBuckley Babatunde Femi Bakare has recently had his PhD dissertation entitled SCIENTIFIC AND MANAGEMENT SUPPORT FOR VENTILATED IMPROVED PIT LATRINES (VIP) SLUDGE CONTENT accepted at the University of KwaZulu-Natal.

He was supervised by Dr Kitty Foxon and co-supervised by Prof Chris Buckley.

The abstract is copied below and the dissertation (5 Mb) is lodged in the SuSanA library (;type=2&id=1945).


Providing adequate sanitation to all in the form of VIP latrines as proposed by the South African Government Strategic Framework for Water Services does not end with building toilets. All municipalities need to plan for maintenance during the operation and when these toilets reach their capacity. An understanding of the processes occurring in pit latrines will facilitate better management during their lifespan and identifying suitable options for dealing with the accumulated sludge when they eventually reach their capacity. This research aims at providing scientific support for decision making in management of accumulated sludge in ventilated improved pit latrines during their life span and when they reach their capacity under South African conditions. The approach to this research work was divided into two main thrusts: The first was to provide an understanding of the processes in VIP latrines and mechanism of sludge stabilization in pit latrines. The second approach was to provide management and disposal options for pit latrine sludge before and once it has been exhumed in the context of the eThekwini pit latrine emptying programme. Two options were used as case studies, namely: (i) deep row entrenchment of exhumed pit sludge for agroforestry and, (ii) in situ treatment of pit sludge using additives.

Three hypotheses were proposed: that

(i) significant biological stabilization occurs in a pit latrine with time, such that the disposal/treatment options depend on the inherent ability of the chosen option to accept the load of solids and organic material in the VIP sludge, the residual biodegradability of the VIP sludge, and the health risks,

(ii) (ii) VIP latrine sludge can be used in deep row entrenchment for agroforestry since the sludge contains nutrients that are available to plants, and that the sludge is sufficiently stable not to cause a negative environmental impact, and

(iii) (iii) that In situ treatment of VIP latrine sludge using pit additives had no significant effect on the rate of mass loss or volume loss of pit latrines contents.

The methodological approach to this research was aimed at addressing the proposed research hypotheses. Thus to test the first hypothesis, two studies were conducted; the first study investigated sludge accumulation rate in pit latrines and the role of digestion processes on sludge accumulation rate in pit latrines. Direct measurement of sludge accumulation rate from selected pit latrines within a community in eThekwini municipality was performed and a laboratory investigation into the effect of moisture content and aerobic/anaerobic conditions on sludge accumulation rate was conducted. The second study investigated the chemical and biological characteristics of pit sludge at different depths within a pit latrine. Research into deep row entrenchment of VIP latrine sludge for agroforestry was conducted to test the second hypothesis. The effect of deep row entrenchment on sludge characteristics and surrounding groundwater at the site was investigated by monitoring changes in sludge characteristics and groundwater quality at the entrenchment site over time. An investigation into the effect of pit latrine additives on pit sludge was conducted to test the third hypothesis. Two sets of trials were conducted; the first was a laboratory trial conducted to investigate the effect of pit latrines additives on collected sludge samples from pit latrine in laboratory scale test units. The rate of mass loss that could arise from the effect of addition of pit additives to sludge in the test unit was determined. The second was a field trial in which pit additives were added to randomly selected pit latrines within a community in Durban and changes in amount of the sludge in the pit was investigated using a laser tape measure and a stereographic imaging technique.

The main findings of this research were:

· The sludge volume accumulation rate in pit latrines investigated was between 120 ℓ/year and 550 ℓ/year regardless of the number of pit users. The overall average sludge accumulation rate was 282 ± 46 ℓ/year. This converts to a per capita sludge accumulation rate of 56 ℓ/person∙year for an average of 5 number of pit users obtained in this study. Statistical analysis performed indicated that sludge accumulation rate on a per capita basis does not decrease with an increase in number of pit users.

· In the laboratory batch experiments, it was observed that by increasing the moisture content the rate of degradation of sludge samples decreases. Over a period of 230 days, mass loss was inversely proportional to total moisture content, and it was found that the mass of solids have been reduced to somewhere between 17 and 64 % of the original sludge mass. This effect was attributed to the exposure of sludge samples in the test units to oxygen, since sludge samples with higher total moisture content in the test units appeared as increased depth of free liquid between sludge sample and air. The calculated mass loss rates observed is expected to be higher than that which will be observed in a pit because the laboratory test had continuous air exposure but pit contents are usually covered over by new materials added to the pit.

· Natural stabilization of sludge within the pit does occur if the pit is managed and maintained properly thus providing a long service life for the pit. It was found that the volume of materials have been reduced to between 50 and 75 % of the volume of material added over the 3 years since the pits investigated were last emptied, based on the observed per capita sludge accumulation rate and an estimate of the material added to the pit per person/year. Thus, by comparing the calculated mass reduction in the batch laboratory experiment with the volume reduction in the field investigation of sludge accumulation rate, it can be infered that sludge densification/compaction could play an important role on the stabilization processes in a pit.

· The nature of sludge in pit latrines varied significantly within the pit and between different pits. It was observed that below the surface layer in a pit, additional stabilization of sludge does occur and the degree of stabilization within a pit increases with increasing depth from the surface down to the bottom layer of the pit. Sludge samples from the bottom of the pit were well stabilized.

· It was also observed from the investigation into deep row entrenchment of pit sludge for agroforestry that further stabilization of pit sludge does occur and as a result of that, nutrients (nitrogen, phosphorus and potassium) locked up in the buried sludge are released as fertilizers. Trees planted near buried VIP sludge showed better growth rate compared to those buried only on soil without VIP latrine sludge and no profound effect on groundwater was observed for the duration in which monitoring was carried out. Further research is needed to develop models for implementing this method cost effectively across a range of conditions.

· Neither laboratory trials nor field trials provided any evidence that the use of pit additives have any beneficial effect on VIP latrine sludge. There were no systematic and statistically significant changes in the rate of mass loss on sludge samples in the laboratory test units as well as changes in sludge content of the pit latrines used for the field trials as a result of pit latrine additives. Although, it was observed that there was significant reduction in sludge height in pit latrines in which only water was added compared to those in which additives were added and those in which nothing was added (control) using the infrared distance measure, this effect can probably not be explained completely to be as a result of increasing biodegradation rate caused by higher moisture content, since this explanation would have been observed in the laboratory trials as well as in measurement taking using the stereographic imaging techniques. Instead, flattening of the surface of sludge content in the pit by the addition of water onto the highest part of the pile may play a part in the apparent reduction of sludge height observed.

It is therefore concluded from the investigation conducted in this research, that sludge content in pit latrines has naturally undergone significant degradation and that the options for disposal of pit latrine sludge would be limited by the characteristics of the sludge. Therefore disposal options involving biological treatment such as disposal into wastewater treatment plants and anaerobic digestion are not appropriate because the residual biodegradability of VIP latrine sludge obtained was very low (about 30 %) and as such would only result in accumulation of undigested solid; of the options considered in this research, deep row entrenchment of VIP latrine sludge for agroforestry seems to be an appropriate option for the disposal of VIP latrine sludge. There was no evidence to suggest that pit latrine additives have any effect in reducing sludge content in pit latrines.

Faecal sludge management Tue, 11 Mar 2014 18:18:16 +0000