Along with many other rivers the Wye is being heavily polluted by manure from the many million free range chickens for eggs and meat in
intensive poultry units (IPUs) in
Powys and Herefordshire, contaminating the Wye's
tributaries.[6][7][8] As of April 2020, there were over 110 registered IPUs in Powys, each with over 40,000 birds (smaller IPUs need not be registered).[9]
...
In addition, runoff from
dairy farms,
farm slurry and
silage liquor are entering the Wye. A study by the
Welsh Government found that only 1% of farm slurry stores in Wales met regulations and that farms were purposely spreading slurry on fields before high rainfall, leading to increased run off into waterways.[10] An investigation by
Greenpeace found that
Environment Agency staff cuts from austerity had reduced pollution inspections by up to one third.[5] An internal report by the Environment Agency showed that the use of a “voluntary approach” by government was leading to increased levels of river pollution across the UK.[11]Powys County Council approved the construction of 20 new free-range chicken sheds in 2019 and as of February 2022 continues to license new chicken farms. In addition to problems with the riverine environment, this is causing air quality issues.[4][6][9] Pollution from the chicken factory farms is estimated to have killed 90% to 97% of the river’s water
crowfoot beds, and 3,000 tonnes more phosphate than plants can absorb is released in the River Wye's catchment every year.[12]
Illinois River (Oklahoma)#Environmental issues "In the early 2000s, the Illinois River had high levels of pollution due largely to water runoff contaminated by chicken manure. ..." An environmental restoration group was formed, "STIR", or "Save The Illinois River, Inc.; Oklahoma"[21][22][23]
Ohio River#Ecology "The Ohio River Valley Water Sanitation Commission... found that 92% of toxic discharges were nitrates, including farm runoff..." tho' it would seem that the bulk of the Ohio River's pollution is industrial in origin,[24][25] including a lot of
PFOA.[26]
Whanganui River has its own legal identity, with the rights, duties and liabilities of a legal person.
See, e.g. The River Restoration Centre,[29]Cranfield University - which offers training courses in Citizen Science geophysical observation[30] and maintains a Manual of river restoration techniques.[31] See also
Hyporheic zone. For Geological Maps at British Geological Survey.[32]
More specifically riverine environment e.g in Wye catchment Farming. Ref (for elsewhere?)[35]
The book, Sixty Harvests Left, makes the case that factory farming is as big a threat to humanity as climate change.
Philip Lymbery explains climate, nature and health emergencies humankind faces. He presents solutions which have the regenerative, nature-positive farming focus on soil and the interconnectedness of all life on our planet. Further resources via this reference.[36]
See also book Tom Philpott, "Perilous Bounty" re shortcomings of agriculture in the USA, in particular California & availability and cost of water (from snow melt and from aquifer) and labor... and in the Midwest, grain belt, the problem of physical loss of soil and the degradation of nutrients.[37]
Also books:
Dr
Dickson Despommier, The vertical farm, Feeding the world in the 21st century - proposing "...EVERY CITY HAS ITS OWN LOCAL FOOD SOURCE grown in the safest way possible, where no drop of water or particle of light is wasted".[38]
Vernon Gill Carter and Tom Dale TOPSOIL & CIVILIZATION REVISED EDITION
ISBN0-8061-1107-0 OKLAHOMA
John Seymour and
Herbert Girardet FAR FROM PARADISE The story of human impact on the environment "... the problems that have precipitated a crisis of survival in the Third World: deforestation, soil erosion, and desert encroachment. And they highlight the way our high-tech agriculture is now pointing us in a similar direction. ...we should be adopting ways of using the land which are biologically sound, and which could sustain us all indefinitely. Such techniques already exist, and many have been in use for thousands of years."
ISBN1-85425-038-8
F.H.King Farmers of FORTY CENTURIES - Permanent Agriculture in China, Korea, and Japan "...journey of an extraordinary man who traveled to Asia to uncover the secrets of the ancient farming methods that have been used to feed millions of people for more than 40 centuries." "Dr. King, former chief of the Soil Division of the U.S. Department of Agriculture, went to Asia in the early 1900s to find out how farmers in China, Korea, and Japan could farm the same fields for 40,000 years without destroying their fertility and without applying artificial fertilizer."
ISBN0-87857-867-6 Information on: ■ composting ■ crop rotation ■ green manuring ■ intertillage ■ irrigation ■ drought-resistant crops
There is an increasing amount of information about Sustainable farming, e.g. whiteoakpastures.com, Bluffton, Georgia[39] and a 'soil farmer of the year' based in Herefordshire[40] and many other local examples of financially viable agroecological practice.[41][42] Ben Taylor-Davies/ 'Regen Ben'[43] See also farming tag on the food alliance blog, and some case studies on zero carbon Herefordshire site.
Use and abuse of fertiliser
Plant growth requires (in addition to carbon, sunlight and other commonly available resources) in particular
Nitrogen,
Phosphorus and
Potassium (hence reference to '
NPK' in regard to fertiliser). The Wye catchment is more than adequately supplied with all of these, but phosphorus (typically as phosphate) tends to have a dominant effect on the ecosystem, with excess legacy phosphate being further worsened by excessive addition, resulting in phosphate-rich run-off from the soil- see RePhoKUs phosphate study by Lancaster University[44] and soil phosphate study by WSA...[45]
Manure (all origins) (see e.g. DEFRA table of contributions by different species[citation needed] (see also, e.g. AHDB source of info[46]) and Nitrogen calculator[47][48] and estimates for England and Wales GIS data[49])[50][51][52][53]
Some Farms have made changes supported by Wye Valley AONB.
[54]
Various sources of information re soil condition, incl [55] and application e.g.[56]
Chemical phosphorus recovery from animal manure and digestate experiments and pilot at Wageningen.[62]
See also University of Georgia paper on poultry manure.[63]
Compost-or-phosphorus-fertiliser-in-africa-agriculture The 'miracle mineral' the world needs - BBC Future[64]
Agro-industrial approaches
Recent decades have seen a proliferation of IPUs in the catchment.[65] Source Apportionment modelling attributes the majority of the phosphate load to (industrial) 'agricultural sources'.
IPUs produce a lot of waste, rich in nutrients unwanted in the Wye catchment.[66] These wastes may be treated, broadly, along one of two approaches:
"Systems are typically not cost-effective for smaller operations (under 400 cows) because the process requires a relatively large area for manure containment and can be very expensive.
"Although nutrients are concentrated, most are retained in a sludge by-product that — unless an advanced separation method is used — is not cost-effective to transport long distances.
"Without advanced separation, the nutrient-rich liquid by-product must be stored and managed as a wet nutrient source to be used as crop fertilizer on nearby fields."
Biomass incinerators
See for example companies involved.[68][69] There are concerns re effects on air quality: various techniques exist to mitigate this- 'burning' is far from simple in order to provide assurance of minimal (ideally no) noxious substances in the exhaust. Control of the combustion process (e.g. dry enough fuel fed in at the right rate) is fundamental; 'air scrubbers' may be provided in the exhaust.[70]
Biomass heating system
A
Biomass heating system can be used to generate heat from biomass, for example in a
combined heating and power application- e.g. Whittern Farm.[71] -In the winter, this can be used to heat the poultry sheds; when they are warm enough the heat can used in other ways, e.g. for grain drying etc. The residue is effectively ash, typically ~7.5% of the mass input, very concentrated in P which is much more easily transported in this format (hazardous waste when 'wet' requires more precautions etc).
Residues: BioChar
Biomass systems can be designed to produce
Biochar. Biochar can be produced either by traditional techniques (cf
Charcoal burning) or by modern biomass
pyrolysis[72] processes, and would appear to have multiple potential uses.[73] These include not only for spreading as a concentrated fertiliser but also for various forms of building material (replacing sand in mortar, as an additive to clay plaster mixes, etc.).[73][74][75] Attention must however be given to mitigating potential air pollution in the form of
carbon monoxide,
NOx (nitrogen oxides), VOCs (
volatile organic compounds),
particulates and other pollutants. The biochar approach releases less carbon into the environment and the biochar may be a better substance for controlled/ progressive release of nutrients as a fertiliser.[citation needed]
Digesters
Anaerobic digesters
In 2018, a world 'first' was claimed for an
AD plant in
Ballymena running exclusively off Poultry Litter.[76][77][78]
"As of 11th April 2022, the UK currently counts 660 operational facilities..."[79]
Netherlands- cutting-edge advanced AD with specific nutrient recovery for use as fertilizer etc.[80][90]
Other digesters
See protest groups: 'Muck off Acorn' (Haverhill, Suffolk),[91] 'Swinford Biogas Concern Group' (County Mayo, Ireland?),[92] 'stop hardwick energy' (Cotswolds/ Stratford on Avon).[93] Stop Witney Digester quoted the NFU Scotland's concerns about distortion to the agro economic landscape from setting up large ADs.[94] Gort (South Galway) has a group fighting plans for a new AD[95] etc.
Aerobic digesters
Aerobic digestion is a process originally used for sewage treatment designed to reduce the volume of sewage sludge and make it suitable for subsequent use; more recently, technology has been developed that allows the treatment and reduction of other organic waste, such as food, cardboard and horticultural waste.[96]
Residues from digesters
Unlike the Biomass approach which results in residue in the form of a dry ash, the output from digesters ('
Digestate') is typically of a moist nature, sometimes sludge or slurry, and sometimes with a separate liquid output in addition. While the Netherlands groenemineralen approach involves significant downstream technology (
Reverse osmosis etc.),[90] simpler approaches involving reed beds etc. seem likely to result in little if any reduction in the total mass of product to be disposed of.[80]
Records[100] of six AD explosions in the US (Jay, Maine Pixelle Specialty Solutions’ Androscoggin Mill (see also apnews.com);[101] Pensacola 22 January 2017 (Kamyr digester explosion) (see also www.northescambia.com);[102] EPDM failure March 2013 Aumsville, Ore.;[103] February 6, 1987, two workers at a wastewater treatment plant were re-draining a sewage digester when an explosion lifted the 30-ton floating cover, killing both workers instantly;[104] Southwest Wastewater Treatment Plant in Springfield, MO),[105] two in the UK (
Avonmouth and
Harper Adams,
Newport, Shropshire[106][107]), plus In Europe, there were about 800 accidents on biogas plants between 2005 and 2015 (tho' only three of them were 'serious' with direct consequences for the human population).Cite error: The <ref> tag has too many names (see the
help page).[108] Fortunately, 'less than a dozen of them had consequences on humans'. e.g. in France (Saint-Fargeau) - no casualties(?)[109][110] and Rhadereistedt, Germany (4 dead).[109][111]
The Environment Agency published a report on example incidents.[118]
See also (re the Wye catchment)
the Preston Brook (a tributary of the
River Leadon) accident from 2016,[119]
suspicions regarding a total of three incidents on the Llynfi from
Great Porthamel Farm and Gatehouse -February 2016 (GP Biotec[120] prosecuted and found guilty[121][122]) and July 2016 (river adjacent to AD site)[123] plus the 31/7/2020 fish kill which occurred on the stretch of the river adjacent to the AD site[124]- and
one incident in 2022 on the Curl Brook, a tributary of the
River Arrow (meeting it at
Pembridge), reported in a tweet[125] from Charles Watson of River Action UK (cf. WUF's project[126] on the Curl).
The site of an AD at Seabournes (Much Fawley Farm), Fawley, near
King's Caple[127][128] has been subject of a number of concerns.[129][130]
Concerns wrt
Combined sewer overflow (CSO) events: Emma Duncan/ The Times "it is illegal to spill sewage into rivers when there is no rainfall, or when the sewage treatment plant is operating below capacity. The first is called a “dry” spill, the second an “early” spill."[131]
Smaller scale installations
Contents (chemistry, biology) - see
Treatment options and/or infobox below
Across the catchment, the RePhoKUs report calculated that there is an excess of 3,000T of phosphates annually above what can be taken up by plant growth, and which is ultimately washed into the river.[12][44]
In early 2023, DCWW published a more detailed set of phosphorus SAGIS analyses.[134] This indicated a (modelled) combined load apportioning at Hay as:
~72% 'agricultural',
~25% 'waste water' (23% STW, 2% CSO),
~3% 'other'.
The detailed pie charts for individual waterbodies suggests relatively heavy loading from STWs on the main stem (although only at Rhayader is it >50%; the Hereford section of the Wye and tributaries around Clehonger are very close to, but just below, 50%), and very heavy loading from agricultural sources in more remote areas (~>80%).
Citizen Science (kicked off by WSA; 2021 expansion coordinated by Elle vonBenson at
Cardiff University):
WUF (hosts of WCP; have procured kit for local groups)[138]
WSACite error: The opening <ref> tag is malformed or has a bad name (see the
help page). Subsequently began soil monitoring with a study sampling across the
Garren Brook subcatchment, reported via the NMB meeting of 28 September 2022.[45]
FoUW[140] See their report[141] to the EAC and the EAC report.[142] With consultancy from
Mott MacDonald, FoUW have kicked off further efforts to coordinate CitSci across the catchment
^"Manure Production". www.sciencedirect.com. Retrieved 15 December 2022. Concentration of manure production is accompanied by a proportionate concentration of nitrogen sources available for leaching to groundwater.
^Maša Legan, Andreja Žgajnar Gotvajn, Klementina Zupan
Potential of biochar use in building materials PMID: 35176567 DOI: 10.1016/j.jenvman.2022.114704 14 February 2022 pubmed.ncbi.nlm.nih.gov, accessed 15 December 2022
^Welsh Assembly funding boost for anaerobic digestion plants 8 May 2007, accessed 18 October 2022. Note: "Anaerobic digestion involves the treatment of organic wastes by bacteria in controlled conditions with limited access to oxygen. The process generates a bio-gas, a form of methane, which can be used to generate electricity. ... One of the first digestion projects to benefit from the Materials Action Programme has been Bank Farm in Powys"
^The New Push to Greenwash Factory Farming - Sentient Media 22 Jun 2021, accessed 18 October 2022. Note: An anaerobic digester (AD) works much as a manure pit does, depriving the poop of oxygen so it breaks down with the help of bacteria. The resulting gases produced are 50-80 percent methane, 20-50 percent carbon dioxide, and small amounts of other gases
^High Court rejects judicial review application over environmental... 25 Aug 2022, accessed 18 October 2022. Note: The High Court has refused a renewed application for permission for a judicial review of Powys County Council's decision to approve a planning application for the expansion of an industrial poultry unit in the catchment area of a Special Area of Conservation (SAC). ... which granted permission for the anaerobic digestion plant, agreed...
^North Devon company fined for pollution that devastated fish population Environment Agency, 29 July 2021, accessed 18 October 2022 Note: The North Devon company that caused a pollution incident leading to a devastating fish kill on the River Mole near South Molton has been fined £2,000 and ordered to pay £9,836 in costs.
^It's been 1 year since explosion at Maine mill "...explosion at the Androscoggin Mill ...remarkably, nobody was injured. — on April 15, 2020" newscentermaine.com, accessed 19 October 2022
^Pulp digester exploded at IP’s Pensacola mill International Paper's containerboard mill in Cantonment, Florida experienced an explosion from a pulp digester that scattered wood fiber, water and pulping liquor over the surrounfing area. 27 Jan 2017 /www.papnews.com, accessed 19 October 2022
^Case #4410 GP Biotec 'Did cause a water discharge activity, namely the discharge of poisonous, noxious or polluting matter to an inland freshwater contrary to Regulation 12(1)(b)'