Biocide can be controllably added to a feed stream for a membrane. In some examples, the feed stream is separated into a primary feed stream and a secondary feed stream, for example, with the secondary feed stream having a lower flow rate than the primary feed stream. The secondary feed stream may be used to monitor and control the addition of the biocide, which is then diluted when the secondary feed stream is combined with the primary feed stream to form a combined stream for delivery to the membrane.

Disclosed herein is a structural drain trap for preventing spread of pathogens between floors, which has an improved structure in which it includes a cover and an outer chamber that are easily coupled to and decoupled from each other and provides a drain line configured to have a double structure at inner and outer portions thereof. Therefore, it is possible to prevent pathogens such as Coronavirus as well as odors or pests from flowing backward as much as possible, and thus to prevent pathogens from spreading through the gap between the floors of buildings such as apartments.

Methods are provided for inhibiting cyanobacteria. The methods include treating a substance contaminated with cyanobacteria with a composition. The composition includes Citrus medica Linn. or an extract of the same.

Methods are provided for inhibiting cyanobacteria. The methods include treating a substance contaminated with cyanobacteria with a composition. The composition includes Citrus medica Linn. or an extract of the same.

[Problem] A treatment agent having an excellent ability to remove biofilms and a biofilm treatment method in which the treatment agent is used are provided.

[Solution] A biofilm treatment agent characterized by containing at least A1 and/or A2 below. A1: An aromatic monohydric alcohol. A2: An anthranilic acid analog and a biosurfactant. Preferably, the biofilm treatment agent is characterized by containing at least an aromatic monohydric alcohol, an anthranilic acid analog, a biosurfactant, and a synthetic surfactant.

One aspect of the invention relates to a composition comprising: water, soybean, molasses, a mineral mixture, an enzyme, and a microbial mixture comprising Bacillus subtilis 34KLB. Another aspect of the invention relates to a fermented composition of the above composition.

One aspect of the invention relates to a composition comprising: water, soybean, molasses, a mineral mixture, an enzyme, and a microbial mixture comprising Bacillus subtilis 34KLB. Another aspect of the invention relates to a fermented composition of the above composition.

A system for treating and/or recycling gray water includes a first receiving tank for gray water, a second receiving tank for treated water and a fluidic treatment circuit between the first and second receiving tanks. The first receiving tank includes an element for oxygenating the water in the first receiving tank and a system adapted to deliver enzymes into the first receiving tank. The fluidic treatment circuit includes a filtration unit, a microfiltration unit including at least one microfilter, a disinfection unit and a membrane ultrafiltration unit.

A publicly accessible urban beach entertainment complex is disclosed, with a man-made tropical, pristine-clear lagoon as the centerpiece of the complex, with surrounding entertainment, educational, sports, and commercial facilities, the complex having controlled public access and providing the look and feel of a tropical beach with clear waters and sandy beaches. In addition a method for efficiently utilizing facilities and land that are vacant, underutilized, have limited uses, or that are contiguous to or nearby recreational, educational, sports, or commercial venues is disclosed. The method providing a publicly accessible urban beach entertainment complex with a centerpiece man-made tropical-style pristine-clear lagoon. The method allows for generating revenue and increasing efficiency by pairing vacant sites, underutilized sites, limited use land, or sites that are contiguous to entertainment, educational, sports, and/or commercial venues with urban beach entertainment complexes. The complex preferably has a controlled public access, thereby allowing entrance upon payment of a fee.

A publicly accessible urban beach entertainment complex is disclosed, with a man-made tropical, pristine-clear lagoon as the centerpiece of the complex, with surrounding entertainment, educational, sports, and commercial facilities, the complex having controlled public access and providing the look and feel of a tropical beach with clear waters and sandy beaches. In addition a method for efficiently utilizing facilities and land that are vacant, underutilized, have limited uses, or that are contiguous to or nearby recreational, educational, sports, or commercial venues is disclosed. The method providing a publicly accessible urban beach entertainment complex with a centerpiece man-made tropical-style pristine-clear lagoon. The method allows for generating revenue and increasing efficiency by pairing vacant sites, underutilized sites, limited use land, or sites that are contiguous to entertainment, educational, sports, and/or commercial venues with urban beach entertainment complexes. The complex preferably has a controlled public access, thereby allowing entrance upon payment of a fee.