A multi-criteria analysis of building level graywater reuse for personal hygiene
Artikel i vetenskaplig tidskrift, 2021

Globally an increasing number of people are facing water scarcity. To address the challenge, measures to reduce water demand are investigated in the world. In the present paper, a novel approach to reuse bathroom graywater for shower and bathroom sink hot water is investigated. The investigation focuses on water and energy savings, water treatment, economic benefit and investigates the main actors and institutions that are involved.

The main results are that there is significant potential for water and energy savings with a positive economic benefit. Water savings of domestic hot water up to 91 % and energy savings up to 55 % were observed. The investigated treatment plant produces recycled graywater with a quality close to drinking water standards.

The investigation also presents that the reason for the positive economic benefit will depend on the utility tariffs. Therefore, two locations with different utility rate structures were investigated, Gothenburg, Sweden and Settle, USA. In Gothenburg, the utility cost for energy was the driver of economic benefit and in Seattle it was the water and wastewater cost that was the driver. The return of investment for the system and installation was shown to be 3.7 years in Gothenburg and 2.4 years in Seattle.

Författare

Jesper Knutsson

Chalmers, Arkitektur och samhällsbyggnadsteknik, Vatten Miljö Teknik

Jörgen Wallin

Kungliga Tekniska Högskolan (KTH)

Timos Karpouzoglou

Kungliga Tekniska Högskolan (KTH)

Resources, Conservation and Recycling

0921-3449 (ISSN)

Vol. 12

Produktion av varmvatten för hygienändamål av gråvatten från badrum

VINNOVA (2018-03409), 2019-01-01 -- 2019-05-06.

Drivkrafter

Hållbar utveckling

Innovation och entreprenörskap

Ämneskategorier

Tvärvetenskapliga studier

Annan naturresursteknik

Miljövetenskap

Infrastruktur

HSB living lab

DOI

10.1016/j.rcradv.2021.200054

Mer information

Skapat

2021-08-30