The paper presents the results of the analyses of the distinctive household sewage inflows frequency to the type Eko-Clear/II sewage treatment plant located in Tęgoborza. The objective sewage treatment plant was designed to receive sew-age from 1630 ENI. The designed average daily sewage inflow Qd.av. equals 204 m3•d-1. The results were analyzed on the basis of the daily read of the inflowing sewage in the 5 years' period 2002-2006. Each year the range of the incoming sewage was described and the frequency of the maximum inflows, exceeding the treatment plant's admissible loads, was discussed. The sewage treatment plant during the research was hydraulically underloaded. In 2002 less than 32% Qd.av. flowed into the treatment plant, in 2003 this amount increased to about 42% Qd.av. In the next year - 2004 the highest inflow was found in the tested period, which was over 49% of the designed inflow of sewage. In next two years the amount of incoming sewage decreased in comparison with the previous years. In 2005 the in-flow balanced around 41%, whereas in 2006 less than 35% Qd.av flowed into the treatment plant. In 2002 the most frequent inflows ranged between 40 m3•d-1 and 60 m3•d-1 or 60 m3•d-1 ...
Occurrence of Phytophthora spp. in Polish rivers and pathogenicity of iso-lates toward some plants were studied. Rivers Jasieniec, Pisia and Rawka were surveyed during all the year with one month interval. First 2 rivers are situated in horticultural areas in Warsaw and Łódź districts whereas the third one is running through agricultural fields and forests. Rhododendron leaves were used as the baits for detection of Phytophthora from water. Number of necrotic spots on baiting leaves was a measure of population densities of Phytophthora spp. in rivers. The occurrence of Phytophthora in water was noticed during all year with the lower density in the 3rd quarter of the year. Five Phytophthora species and taxon Salixsoil were identified among isolates recovered from 3 rivers. During all year from 3 surveyed rivers (except from Pisia in the first quarter) P. citricola was recovered as the most often occurring species. Additionally P. cactorum, P. cambivora, P. cinnamomi and P. megasperma were detected from rivers. In laboratory trials water isolates of P. cactorum and P. citricola colonized roots, stem parts and leaves of birch with the significantly faster spread of necroses on plant parts inoculated by P. citricola. In greenhouse trial both species caused root ...
Influence of water source on frequency of Phytophthora occurrence was the purpose of this study. Phytophthora spp. was detected in 3 rivers, 2 canals and 2 ponds. Rivers were situated in different part of Poland. Two of them (Jasieniec and Pisia) is following through horticulture areas, whereas Wisła - through area with hardy ornamental nursery stocks. Water canals and ponds are situated nearly or in nursery. Rhododendron leaves baits cv. ‘Nova Zembla' were used for detec-tion Phytophthora in water from March to November. Number of necrotic spots on baiting leaves was the measure of population density of Phytophthora in water. Phytophthora spp. were detected from water from March to November. In canals, the most of necrotic spots on baiting leaves were observed in May and June. In rivers Jasieniec and Rawka and water ponds significantly more necrotic spots on baiting leaves were noticed in March, April, May and in September, October and November. P. cirticola was recovered as the most often occurring species and next P. cryptogea, P. cinnamomi, P. citrophthora, P. taxon Salixsoil.
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