The Henderson Water Utility (HWU) webpage contains useful information which shows the difference between combined and separated sewer systems.
Library

This factsheet deals with technical aspects of gravity sewers: applicability, advantages and disadvantages, design criteria, performance, O&M, costs, etc.
U.S. EPA (n.y): Sewers, Conventional Gravity. (= Collection Systems Technology Fact Sheets ). United States Environmental Protection Agency (EPA) URL [Visita: 28.05.2019]
This document was orginially presented for MSc Course on "Renewable Energy and the Environment” at the University of Reading. It present basic therotical principals for the technical design of biogas burners.
FULFORD, D. (1996): Biogas Stove Design. A short course. Kingdom Bioenergy Ltd.; University of Reading URL [Visita: 28.05.2019]
This technical brief describes several possibilities of emptying pit latrines and helps to find the most suitable method.
PICKFORD, J. SHAW, R. (1997): Emptying Pit Latrines. (= Technical Briefs, No. 54 ). Loughborough: Water and Environmental health at London and Loughborough (WELL) URL [Visita: 28.05.2019]This short document describes the functioning of the gulper technology to empty pit latrines or septic tanks.
IaW (2007): The Gulper – a manual latrine/drain pit pump. Phnom Penh/Casteren: Ideas at Work (IaW) URL [Visita: 28.05.2019]This book published by Eawag/Sandec compiles existing and recently generated knowledge on anaerobic digestion of urban biowaste at small and medium scale with special consideration given to the conditions prevailing in developing countries. Written for actors working in the waste and renewable energy sector, the book is divided into two parts: Part 1 focuses on practical information related to the anaerobic digestion supply chain (substrate-, process-, and product chain), and Part 2 presents selected case studies from around the world.
VOEGELI, Y. LOHRI, C.R. GALLARDO, A. DIENER, S. ZURBRUEGG, C. EAWAG (2014): Anaerobic Digestion of Biowaste in Developing Countries. Practical Information and Case Studies. Duebendorf: Swiss Federal Institute of Aquatic Science and Technology (Eawag) URL [Visita: 28.05.2019]
This article reviews low-cost sewerage options, their potential and their limitations. It also provides guidance on how to choose the most appropriate option, and gives examples of their successful application.
MARA, D. (1996): Low-cost Sewerage. Leeds: University of Leeds URL [Visita: 28.05.2019]
This technical note describes the main technical elements involved in designing a sewer system.
USAID (1982): Designing Sewer Systems. Washington D.C. (USA): United States Agency for International Development (USAID). Water for the World -Technical Note No. SAN.2.D.4 URL [Visita: 28.05.2019]
Over the coming 90 years, combined sewer systems will be phased out in the Municipality of Aalborg. Instead, the Municipality will introduce separate systems for stormwater and sewage.
LADEN, B. (2010): No more overloaded sewer systems. Copenhagen: Information Center for Climate Change Adaptation, Danish Ministry of Climate and Energy, Danish Energy Agency URL [Visita: 28.05.2019]
In this report a good collection of Nordic innovative companies and their products are introduced. The report highlights some examples in the key technologies. It can be seen that in the Nordic countries there is a good industry base to cover the most promising recent innovative technologies.
GREENNET FINLAND (n.y): Sludge Treatment. Vantaa: Greennet Finland URL [Visita: 27.05.2019]
This report compiles international experience in greywater management on household and neighbourhood level in low and middle-income countries. The documented systems, which vary significantly in terms of complexity, performance and costs, range from simple systems for single-house applications (e.g. local infiltration or garden irrigation) to rather complex treatment trains for neighbourhoods (e.g. series of vertical and horizontal-flow planted soil filters).
MOREL, A. DIENER, S. (2006): Greywater Management in Low and Middle-Income Countries, Review of Different Treatment Systems for Households or Neighbourhoods. (= SANDEC Report No. 14/06 ). Duebendorf: Swiss Federal Institute of Aquatic Science (EAWAG), Department of Water and Sanitation in Developing Countries (SANDEC) URL [Visita: 27.05.2019]
In this mini-review, the `state of the art' of several fermentation processes is discussed, starting with the most advanced process of ethanol production.
CLAASSEN, P.A.M. ; LIER, J.B. van ; LOPEZ CONTRERAS, A.M. ; NIEL, E.W.J. van ; SIJTSMA, L. ; STAMS, A.J.M. ; VRIES, S.S. de ; WEUSTHUIS, R.A. (1999): Utilisation of Biomass for the Supply of Energy Carriers. Entradas: Appl. Microbiol. Biotechnol: Volume 52 , 741-755. URL [Visita: 27.05.2019]
These terms of references define the legal regulations in Switzerland concerning the water protection and air pollution control for the use of nutrients and fertilisers in agriculture.
BAFU ; BLW (2012): Nährstoffe und Verwendung von Düngern in der Landwirtschaft. Ein Modul der Vollzugshilfe Umweltschutz in der Landwirtschaft. Bern: Bundesamt für Umwelt (BAFU) / Bundesamt für Landwirtschaft (BLW) URL [Visita: 27.05.2019]
In the Flintenbreite in Luebeck, Germany, blackwater is collected in vacuum toilets. Together with organic wastes from the kitchen it is converted to biogas. Greywater is treated in a reed-bed filter. The project demonstrated the consistent utilisation of ecological building materials, the use of self-sustaining, integrated energy and wastewater concepts, and the implementation of innovative energy saving technologies, with a minimisation of interference in nature, and a responsible, integrative and active cohabitation of the inhabitants.
OTTER-WASSER (2009): Ecological housing estate, Flintenbreite, Luebeck, Germany - draft. (= SuSanA - Case Studies ). Eschborn: Sustainable Sanitation Alliance (SuSanA) URL [Visita: 27.05.2019]
Complete report on the pilot scale struvite reactor developed and operated in the Kathmandu Valley.
ETTER, B. (2009): Optimization of low-cost struvite recovery. (= Master thesis ). Swiss Federal Institute of Technology Lausanne (EPFL) URL [Visita: 27.05.2019]
Decentralized anaerobic digestion is a promising technology to handle the large organic fraction of the municipal solid waste (e.g. kitchen waste) with the additional benefit of producing biogas as well as fertilizer. This paper evaluates the suitability of the ARTI Compact biogas system as a decentralised low-tech treatment option for the organic fraction of household waste in Dar es Salaam, Tanzania.
LOHRI (2009): Research on Anaerobic Digestion of Organic Solid Waste at Household Level in Dar es Salaam, Tanzania. (= Bachelor Thesis ). Zurich University of Applied Sciences (ZHAW) URL [Visita: 27.05.2019]This is homepage of the EAWAG project on fertiliser production form urine (NOVA 6) presents results form pot test and field experiments of the application in agriculture and steps forward for scaling up.

Different strategies and methods to achieve the target of recovering phosphorus from sludge are discussed based on reports from the Swedish environment protection agency (SEPA) and with special emphasis on extraction of phosphate from wastewater, sludge and ash at central plants. Some possible improvements are briefly discussed, such as the use of certain comparatively clean sludge fractions and use of two-stage technology for the recovery.
HULTMAN, B. LEVLIN, E. PLAZA, E. STARK, K. (n.y): Phosphorus Recovery from Sludge in Sweden - Possibilities to meet proposed Goals in an efficient, sustainable and economical Way. URL [Visita: 27.05.2019]
Presentation on experiences with the use of urine (and faeces) in agriculture including research results, conducted taste tests and calculations on the fertiliser value.
DAGERSKOG, L. SuSanA (2009): Urine and Faeces as Fertilizers in the CREPA Network. pdf presentation. (= SuSanA presentation WG , 5 ). Ouagadougou: Sustainable Sanitation Alliance URL [Visita: 27.05.2019]