The dataset presented here consists of raw data on the quality of influent greywater generated from residential buildings (100 PE) and the effluent quality of greywater after treatment using a constructed wetland that was built in 2001. A total of 15 samples of influent and effluent samples were taken between February 2023 and Jan 2024, in different months to assess seasonal variations. This 2023-2024 data was compared with the few existing effluent quality data from 2001-2014. The analyzed parameters include organic matter (e.g. TSS, BOD, COD, TOC), total nitrogen, total phosphorus, salt, and microorganisms (E. coli, enterococci, Clostridium perfringens, Legionella spp, Pseudomonas aeruginosa, and Campylobacter). Supporting parameters e.g. turbidity, pH, and conductivity are also included in the dataset.

The presented dataset consists of concentration data on the quality (Chemical analysis, Micorpollutants, Temperature) and quantity (volume and flow) of blackwater digestate concentrate and condensate at various volume reduction factors. The concentrate and condensate were produced using a low-temperature evaporator. Data from sensors monitoring the volume of the concentrate and condensate is also provided. Experiments were carried out in RecoLab, Helsingborg, during May and August 2023 

The dataset presented here consists of raw data on the quality of influent greywater generated from an urban city district (1000 persons approx.) in Helsingborg, Sweden and the effluent quality of greywater after treatment using an outdoor green wall. A total of 8 samples of influent and effluent greywater were taken between October 2023 and June 2024, in different months to assess seasonal variations. The analyzed parameters include organic matter (e.g. TSS, BOD, COD, TOC), total nitrogen, total phosphorus, salt, and microorganisms (E. coli, enterococci, Clostridium perfringens, Legionella spp, Pseudomonas aeruginosa, and Campylobacter). Supporting parameters e.g. turbidity, pH, and conductivity are also included in the dataset.

This study evaluated a 23-year-old hybrid treatment wetland (HTW) treating greywater from a residential building in Norway using historic monitoring (2001–2014) and recent sampling campaigns (2023–2024), representing one of the longest documented systems operating in a cold-climate setting. The system consisted of an aerobic vertical flow filter with Filtralite®, and an anaerobic horizontal flow filter with Filtralite®P for enhanced phosphorus removal. Recent findings (2023–2024) show improved organic matter removal, with >98% BOD reduction and effluent BOD consistently <2 mg/L. However, nutrient removal declined over time, with effluent total nitrogen of 3.3–5.6 mg/L (59–74%). Total phosphorus increased from 0.02–0.08 mg/L (2001–2008) to 0.15–0.45 mg/L (2014–2024), indicating partial exhaustion of the Filtralite®P media. The HTW achieved effective log reductions of 1.6–3.4 for E. coli, 2.1–3.4 for enterococci, 1.6–3.1 for Clostridium perfringens, and 2.0 for Pseudomonas aeruginosa. Legionella spp. remained below detection limits, and Campylobacter was not detected. A quantitative microbial risk assessment (QMRA) showed the annual risk of infection was <10⁻⁴ for E. coli and Clostridium perfringens. The HTW met Norwegian discharge standards of BOD <20 mg/L, phosphorus <1 mg/L, E. coli <100 MPN/100 mL, and complied with EU standards for agricultural water reuse.

Human excreta contains most of the nutrients consumed in diets, making its recovery essential for sustainable sanitation. Separately collecting blackwater (faeces and urine) enables efficient nutrient and energy recovery. After anaerobic digestion, blackwater produces a nutrient-rich liquid that requires transportation and sanitation for use as fertiliser; concentrating this liquid reduces transport costs and environmental impact. This study investigates nutrient concentration in blackwater digestate using a pilot-scale evaporator designed to operate with waste heat as its primary energy source. Experiments were conducted under two pH conditions (6 and 2.8). The evaporator operated at 60 °C with enhanced heat transfer and gravity-based separation, achieving volume reduction factors of 87 (pH 6) and 85 (pH 2.8). pH strongly influenced nutrient solubility (phosphorus, magnesium, calcium) and equipment leaching. Pharmaceutical residues persisted in concentrates, indicating a need for additional treatment. Final concentrates contained NPK up to 6.7%, 1.5%, and 1.2%, respectively. The specific energy consumption (SEC) increased with concentration, ranging from 0.56 kWh to 1.1 kWh at 60 °C, approximately 1.4–2.8 times higher than the theoretical value. Equipment modifications for low pH and improved material selection could enhance efficiency and regulatory compliance. Future designs may also integrate heat recovery systems to reduce energy demand and improve sustainability.

This study investigated the performance of the vertECO® green wall system with lightweight expanded clay aggregate (LECA) and biochar-pumice media in treating greywater from an urban city district (1000 residents) under Scandinavian climate conditions. Over one year, the system effectively removed organic matter, achieving 90–97 % of biological oxygen demand (BOD) reduction and 56–94 % for total suspended solids (TSS). However, nitrogen and phosphorus removal were inconsistent and low. Significant reductions of up to 5.1 Log₁₀ of Escherichia coli (E. coli), 4.0 Log10 of enterococci, 4.5 Log10 of Pseudomonas aeruginosa, and 2.7 Log10 of Clostridium perfringens were observed, while Legionella and Campylobacter were not detected. Cold temperatures (<5 °C) and vegetation had a minimal impact on the treatment performance. Among 17 plant species, Carex nigra, Armeria maritima, Lythrum salicaria, and Menyanthes trifoliata, Comarum palustre, Caltha palustris, and Iris sibirica showed high resilience. Despite the effective treatment of organic matter and pathogenic microorganisms, the average effluent quality did not meet the European Commission's Class A requirement (≤10 mg/L for BOD and TSS, ≤5 NTU for turbidity, and ≤ 10 CFU/100 mL for E. coli) for the reuse of reclaimed water in agriculture. Moreover, the microbial quality of the effluent indicated the necessity of a hygienisation step and protective measures to reduce infection risks if such a green wall system is placed in a public setting. 

After energy recovery from blackwater via anaerobic digestion, technologies such as struvite precipitation and ammonia stripping can be used to enhance nutrient recovery. However, the presence of suspended solids, organics and metals, can negatively impact the nutrient recovery processes. This study examined the treatment of digested blackwater, applying either a ceramic microfiltration membrane or a drum filter, operating in parallel in a source-separated wastewater plant. The digestate as well as the permeates from the membrane and drum filter were sampled regularly and evaluated. In general, the ceramic membrane proved to be more efficient in improving the quality of digested blackwater in comparison to the drum filter. The ceramic membrane reduced total suspended solids to below the detection limit, while the drum filter achieved 74 % removal. The membrane removed 74 %, 85 % and 76 % of TOC, BOD7 and COD-Cr, respectively, higher than the corresponding treatment with the drum filter, which removed 41 %, 42 % and 34 %, respectively. No significant differences in phosphate and ammonium concentrations (P-value = 0.05), before and after both treatment methods were observed. The membrane removed particulate-bound metals (As, Cd, Cr, Cu, Ni, Pb and Zn) up to 25 %, 95 %, 87 %, 95 %, 66 %, 90 % and 98 %, respectively. The drum filter achieved lower removal for particulate-bound As, Cd, Ni, Pb and Zn for 25 %, 79 %, 44 %, 56 % and 86 %, respectively. The removal of metals is critical to maintain struvite purity and prevent the struvite contamination due to co-precipitate of these metals.

Minireningsverk blir ett alltmer populärt alternativ för behandling av källsorterat BDT-vatten. Vi utvärderade prestandan hos åtta BDT-vattenanläggningar (tre olika typer av minireningsverk och en markbädd) med avseende på rening av organiskt material, näringsämnen, mikroorganismer och mikroplaster. Den mest effektiva behandlingen visade sig vara i markbädden. De flesta minireningsverk uppnådde >80% BOD-reduktion, vilket är reningskravet för BDT-vatten enligt Havs- och vattenmyndigheten. Dock var reningseffektiviteten för E. coli och enterokocker låg, vilket tyder på att det eventuellt behövs ett desinfektionssteg i fall BDT-vattnet ska återanvändas.