The water quality of rivers currently is seriously polluted in Taiwan for influencing drinking water quality, harming onto plants growth caused soil pollution problems by using river irrigation and harming the human health indirectly by contamination in river sediments. In this work, we will investigate the area of river water quality characteristics and pollution sources to solve effectively for the pollution problems in the river area of A-Gong-Den in Kaohsiung County. The source of the river area of this study is dam of A-Gong-Den. Their water quality is polluted majorly by the domestic and industrial wastewater. The dark red-color of river body was due to the effluent from those industrial factories. Heavy metals such as Zn, total Cr ions and conductivity were all over the water quality standard of irrigation uses. Thus, we will try to improve the color problems in this area of river by diagnostics method in five factories having wastewater treatment plants. The effective solution in management and controlling will be discussed. We investigate the treatment facilities and performance evaluation in five industrial plants. We found the wastewater treatment and operation technology should be done and elevated in some factories. Importantly, the marked signs in pipelines in wastewater treatment were not clear and operated under not normal conditions. The EPA in county should send officers for checking the operations of the wastewater treatment plants in listings with a normal period for once.

Syftet var att finna en biologisk behandlingsmetodik för avloppsvatten som skullekunna reducera utsläpp av näringsämnen till recipienten Humlebäcken frånavloppsreningsverket (ARV) i Nyvång. Nyvångs reningsverk planeras uppgraderas och utökas och därtill har ärendet nekats då utsläpp till Humlebäcken förfaras bli för höga. Mikroalger som behandlingsmetod för avloppsvatten undersöktes via litteraturanalys ibåde svenska klimat och vid uppskalning. Det kunde inte hittas metodik eller teknik för att på industriell skala använda mikroalger till behandling av avloppsvatten idag. Dock presenteras flera olika tekniker som kan kopplas samman för ökad effektivitet. Vidare finns det stor potential om att mikroalgssystem kan kopplas samman med andra industriers spillvärme och rökgaser för ökad produktion av biomassa och rening av rökgas. Andra former av kemisk försedimentering och anaerob behandling från Energipositiv Rening presenteras, möjligheten finns att dessa kan kopplas samman med mikroalgssystem för komplett behandling till lägre kostnader av konventionell behandlingsteknik. Till slut presenteras påverkande faktorer vid nordiska klimat och utmaningar i form av striktare reningskrav och återföring av slam. Det presenteras kort om andra biologiska tekniker som svampodling och multitrofiskt vattenbruk vilka kan kopplas samman medmikroalgssystem för ökad resurseffektivitet och högre reningsgrad. Se figur 18 förgrafisk summering. / The purpose was to find a biological treatment method for wastewater which could reduce emissions of nutrients to the recipient Humlebäcken from the wastewater treatment plant (WWTP) in Nyvång. Since Nyvång WWTP plans to upgrade and expand have been denied for fears of further contamination of Humlebäcken. Microalgae as a treatment method was examined in this literature analysis for Swedish climates and upscaling. For industrial purposes no technique or method could befound which could be applied to wastewater currently. Several techniques are presented however in the hopes that in combining them a higher efficiency might beachieved. If microalgae systems could be integrated with waste heat and flue gas from industry, then higher productivity could be achieved whilst reducing emissions from the flue gas. Other forms of pre-sedimentation and anaerobic treatment methods from EnergyPositive Purification systems are presented as there's a possibility these can be connected to microalgae systems for complete treatment and less costs. Factors which affect microalgae cultivation in Nordic climates and challenges in terms of stricter emission requirements and reuse of sludge are presented lastly. Other biological treatment methods like mushroom and multi-trophic aquaculture which can be integrated to microalgae systems are shown in hopes of achieving higher resource efficiency and pollution reduction. See figure 18 for graphical abstract.

<p dir="ltr">Aquaculture is a controlled aquatic farming sector and one of the most important human food sources. Fish farming is one of the predominant, fast-growing sectors that supply seafood products worldwide. Along with its benefits, aquaculture practices can discharge large quantities of nutrients into the environment through non-treated or poorly treated wastewater. This study aims to understand the nutrient composition of fish wastewater and the use of indigenous bacteria, cyanobacteria, and microalgae as an alternative biological treatment method. Wastewater samples from a local fish farming facility were collected and treated using six different species of cyanobacteria and microalgae include <i>Chroococcus</i><i> </i><i>minutus</i>, <i>Porphyridium</i><i> </i><i>cruentum</i>, <i>Chlorella vulgaris</i>, <i>Microcystis aeruginosa</i>, <i>Chlamydomonas </i><i>reinhardtii</i>, and <i>Fischerella</i><i> </i><i>muscicola</i>. All the samples were incubated for 21 days, and the following parameters were measured weekly: Chemical oxygen demand (COD), phosphate, total dissolved nitrogen, and dissolved inorganic nitrogen. In addition, dissolved organic nitrogen (DON), bioavailable DON (ABDON), and biodegradable DON (BDON) were calculated from the mass-balance equations. Colorimetric and digestive methods were used for the parameter measurements. The results showed that <i>C. </i><i>reinhardtii</i> reduced the soluble COD concentration by 74.6%, DON by 94.3%, and phosphorous by more than 99%. Moreover, <i>M. aeruginosa</i>, and <i>C. </i><i>minutus</i> significantly reduced inorganic nitrogen species (>99%). This alternative fish wastewater treatment method was explored to gain insight into fish wastewater nutrient composition and to create a sustainable alternative to conventional fish wastewater treatment methods.<b> </b></p>