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Efficiency of the Installation to Treatment of Outflow from the Hybrid Constructed Wetland System and Possibility of Reuse of Treated Wastewater in the Household

Myka-Raduj Anna, Siwiec Tadeusz, Rybczyńska-Tkaczyk Kamila, Raduj Waldemar, Jóźwiakowski Krzysztof

Advances in Science and Technology. Research Journal

2024

Vol. 18, no 4

296--311

The purpose of this study was to determine the effectiveness of the operation of a novel installation for treating the outflow from a hybrid constructed wetland system and the possibility of domestic wastewater reuse. The study was carried out in 2022-2023 at a facility located in the Polesie National Park (PNP) in Poland. The analyzed installation for the treatment of wastewater discharged from the constructed wetland system is located in the basement of a single-family building and consists of a filtration system including: yarn, spun and carbon filters, and a UV lamp. In turn, the hybrid constructed wetland system from which the treated wastewater is recycled to the building consists of a 2-chamber primary settling tank and a system of two VF-HF type beds with common reed and willow. During the study period (October 2022 to December 2023), 14 series of analyses were performed, during which the values of selected physico-chemical and microbiological indicators were determined in the collected samples of treated wastewater. On the basis of the performed tests, it was found that the analyzed system provided an average efficiency of reduction of total suspended solids and BOD5 at 46.8 and 45.8%, respectively. Smaller effects were obtained for the reduction of COD (22.7%), total nitrogen (4.9%) and total phosphorus (16.3%). In contrast, the average reduction effects of microbiological indicators were very high, amounting to 92.7 and 97.1% for Escherichia coli and enteroccocus bacteria, respectively. The study showed that the effluent flowing out of the hybrid constructed wetland system after treatment in the analyzed installation could be reused for toilet flushing or green watering, as it usually did not contain microbiological contaminants. It was determined that the recycled treated wastewater could replace, on average, 18.7% of the good-quality water supplied by the mains water supply in the studied household.

Studies on the Use of Water Reclaimed from Textile Wastewater in a Closed Circuit

Sójka-Ledakowicz J., Kos L., Żyłła R., Paździor K., Ledakowicz S.

Fibres & Textiles in Eastern Europe

2017

Vol. 25, no. 5 (125)

61--66

The aim of the study was to evaluate the effectiveness of the technology proposed for low-loaded wastewater treatment enabling multiple reuse of recycled water in a closed circuit. The subject of the study was real textile wastewater produced during the dyeing of cellulose fibres with reactive dyes. Initial wastewater was divided into low- and high-loaded streams. The low-loaded wastewater was subjected to pretreatment at biological, ultrafiltration and ozonation stages. The pretreatment was carried out four times. The reclaimed water was reused in the rinsing and washing operations. Evaluation was made of functional properties of cotton knitted fabric dyed in the process in which the reclaimed water was used. The permissible number of recycling cycles of reclaimed water for selected unit operations (rinsing, washing) was analysed with respect to functional properties of the dyed knitted fabric. In selected cases for all parameters tested, good, acceptable colorfastness was obtained.

Celem badań było sprawdzenie możliwości wielokrotnego użycia odzyskanej ze ścieków pofarbiarskich wody w obiegu zamkniętym. Przedmiotem badań były rzeczywiste ścieki włókiennicze pochodzące z technologii barwienia wyrobów z włókien celulozowych barwnikami reaktywnymi. Ścieki wyjściowe były rozdzielane na strumienie niskoobciążone i wyżej obciążone. Ścieki niskoobciążone poddano podczyszczaniu w etapach biologicznym, ultrafiltracji i ozonowania. Podczyszczanie wykonywano czterokrotnie. Odzyskana woda była zawracana do operacji płukania i prania. Dokonano oceny parametrów użytkowych dzianin bawełnianych wybarwionych w procesie technologicznym, w którym wykorzystano odzyskaną wodę. Dopuszczalna ilość cykli zawracania odzyskanej wody do wytypowanych operacji jednostkowych (płukanie, pranie) była analizowana w odniesieniu do uzyskanych parametrów użytkowych barwionych dzianin. W wybranych próbach dla wszystkich badanych parametrów uzyskano dobre, akceptowalne odporności wybarwień.