Solutions for reducing septicity in pumped sewer rising mains?


As sewage is moved to treatment centres via pumped systems there is a risk of waste water becoming septic, causing odour and damage to downstream assets due to Hydrogen Sulphide emissions.

Anglian Water has many hundreds of sites where chemical dosing is used to control septicity in rising mains with long retention periods, which involves transporting large quantities of chemicals to diverse sites. Every year we build many more sites in this way.

We are looking for an innovative solution to reduce septicity in pumping mains, ideally we are looking for a method which does not involve chemical dosing.



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Sameer Dohare
We have identified an innovative solution for these type of problems.
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lyseconcept jean Marius
French English
Les eaux usées domestiques ont une caractéristique de base 'biologique'. Elles contiennent pour plus de 8% de bactéries utiles. L'action de ces micros organismes est d'éliminer la matière organique contenue dans les eaux usées. Une grosse partie provient de la défécation et l'autre partie provient de la préparation alimentaire.
Si on laisse le temps aux micros organismes de faire leur travail d'élimination de la matière organique, dans un milieu favorable 'biologique', la matière organique disparait entre 12 et 15 jours.
Le liquide en sortie contient plus de 94% d'eau biologique, des fertilisants pour la biodiversité végétalisée qui va purifier le sol de la pollution urinaire.
Une économie de prélèvement d'eau souterraine, une réduction de la pollution des milieux hydrauliques naturels, une augmentation de développement de la biodiversité végétalisée qui réduit l'érosion des sols, une réduction financière énorme du coût de gestion inefficace des eaux usées.
Plus de 45 millions de tonnes d'excréments sont produit sur notre planète que la technologie actuelle transforme en 45 millins de tonnes de boue d'excréments , un véritable poison pour l'environnement.
Domestic wastewater have a basic feature organic '. They contain more than 8% for beneficial bacteria. The action of these micro organisms is to eliminate the organic matter in the wastewater. a large part from the defecation and the other part comes from the food preparation.
If allowed time for micro organisms to do their job of removing organic matter, in a supportive environment are biological, organic matter disappears between 12 and 15 days.
the output liquid contains over 94% organic fertilizer water to vegetated biodiversity that will purify the soil of the urinary pollution.
A groundwater sampling economy, reduction of pollution of natural water environments, increased development of biodiversity vegetated reducing soil erosion, a huge financial cost reduction of inefficient management of wastewater.
More than 45 million tons of faeces are produced on our planet that current technology turns into Millins 45 tons of excrement mud, a real poison for the environment.
Ryan Hennessy
Mixing and aeration are the two that come to mind. Anything that can be done to eliminate the retention time (sometimes lower float setting etc.) may also help.

The chemical route involves iron salt (precipitates sulfide), calcium nitrate, hydrogen peroxide, potassium permanganate, and chlorine as other options. In some countries chlorine may not be favorable due to disinfection byproduct concerns.
Nandkishore Purohit
A potential solution came out of the CCTV Survey of serage network we had carried out in 1997. We found that none of the RCC sewers showed any signs of crown corrosion despite being more than 40 years old at the time. The Reson: The city supply was based on ground water which was rich in nitrates.
Hence a potential solution is to add ~50 mg/l as Nitrate nitrogen in the pump sump. The aerobes which are very quick multiplying, can also use NO3 as electron acceptors and keep septicity at bay. This has been successfully tried at a small SPS as well, with good results and elimination of odors
shankar mallipatna
Randall -as you may be aware Singapore is the only nation to convert waste water to potable standards. They claim 98% of the total waster water effluent purified. If there is any other country/region where recycling on a large scale together with energy generation is being done, all of us in this forum would be eager to know about it.
John Cook

I have heard about products such as bio-enzyme blends which are supposed to inhibit anaerobes. However, these additives (we're back to a chemical) are proprietary, and I have found it virtually impossible to obtain any objective, non-anecdotal evidence of efficacy. But in theory, there could be catalysts that make it difficult for anaerobes to thrive.

Another option, but we're still looking at chemical addition, is to increase the pH using something such as MgOH. That would certainly help control formation.
Randall E Witte
One option is to totally eliminate the waste water by converting it into distilled water- easily used for a variety of purposes, including treatment to make it totally safely potable.

Equipment is available that will convert sanitary waste water into distilled water while also producing electricity.

Systems are available as small as 2500 liters per day input, 2900 LPD output and 30 kW to as large as 211,000/240,000 LPD modules and 2 MW which can be paralleled for higher output if needed.
Inamul Choudhury
Can I request the budget requires for a conversion. Whether it would be economically viable for a plant 100,000 LPD plant
in a country in south Asia.
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